Open Access

Synthesis, Characterization, and Luminescent Properties of Polymer Complexes of Nd(III) with β-Dicarbonyl Ligands

  • Oleksandra Berezhnytska1,
  • Irina Savchenko2Email author,
  • Nadiya Ivakha1,
  • Olena Trunova1,
  • Nataliya Rusakova3,
  • Sergiy Smola3 and
  • Oleksandr Rogovtsov1
Nanoscale Research Letters201712:338

Received: 16 December 2016

Accepted: 13 April 2017

Published: 8 May 2017


The neodymium(III) complexes with 2-methyl-5-phenylpenten-1-3,5-dione and allyl-3-oxo-butanoate were synthesized. The polycomplexes on their basis and copolymers with styrene and N-vinylcarbazole in ratio 5:95 were obtained by free-radical polymerization. The results of above studies have shown that the configuration of the chelate unit is unchanged during the polymerization. As a result, the type of coordination was determined and the structure of coordination polyhedra was assumed. The luminescence spectra of obtained metallocomplexes and polymers in solutions and solid state are investigated and analyzed.


Neodymium(III) Polymer complexes Spectra Structure Luminescence


Nowadays, metal-containing polymers are of great interest due to a wide range of their practical application in nonlinear optics [14] and as sorbents [5], catalysts [6], bactericidal materials [7], etc. Both metal ion and polymeric matrix determine the properties of such copolymers, and it makes it feasible to purposely affect the properties of the final material.

The synthesis and study of lanthanide-containing polymeric compounds based on macromolecular metal chelates is one of the promising areas of coordination chemistry, which is due to the unique properties of both the lanthanides and the metallopolymers on their basis [8]. This class of compounds comprised mainly of the hybrid materials obtained by grafting of lanthanide chelates on the surface of colloidal silica or other silicon-containing compounds and by intercalation of lanthanide salts in the polyvinylcarbazole, polystyrene, or poly(methyl methacrylate) polymeric matrixes [913]. Other representatives are the macromolecular metal chelates synthesized by polymerization of monomeric metal complexes [1416] or by simultaneous polymerization of metal complexes and organic polymers [17, 18]. In our opinion, the use of the latter type of compounds is the most optimal way to obtain functional materials with a uniform distribution of metal in polymeric matrix. In order to implement this approach, a ligand should contain unsaturated double bond making it feasible to use the corresponding metal complex as monomer in polymerization reaction.

The luminescent properties of low-molecular lanthanide complexes [19, 20], hybrid materials on their basis, and lanthanide salts dispersed in polymeric matrixes are investigated rather thoroughly [2123]. On the other hand, the number of papers dealing with the lanthanide-containing metallopolymers, in which metal ion is chemically bonded with polymeric chain, is considerably less [2426].

The present work deals with luminescence properties of neodymium(III) complexes with two unsaturated β-dicarbonyl ligands (2-methyl-5-phenyl-1-penten-dione-3,5 (mphpd)) and allyl acetoacetate (allyl-3-oxobutanoate (alacac)) in order to obtain efficient emitting materials. Previously, we have reported only the synthesis and analysis of monomeric complexes with methacroylacetophenone (mphpd) [27].

The main aim of this paper is to study the synthesis of neodymium(III) complexes with alacac and methacroylacetophenone-based copolymers with styrene and N-vinylcarbazole and compared the luminescence properties of all compounds obtained.


Neodymium(III) nitrate hexahydrate Nd(NO3)36H2O, allylacetoacetate, styrene, N-vinylcarbazole (VK), and other reagents and solvents were of analytical grade. Sodium salt of methacrylacetophenone was synthesized according to the method described in [28]. The result of its chemical analysis and 1H NMR study is listed in Table 1.
Table 1

Analytical and 1H NMR data for Na(mphpd)


Element: calculated (found), %

1H NMR (CDCl3), δ (ppm)












1.98 (s., 3H, CH 3 );

3.25 (s., 1H, =C(H)H);

3.62 (s., 1H, =C(H)H);

4.82 (s., 1H, CH);

7.05–7.96 (mult. br., 5H, C6H 5 )

Synthesis of the Nd(III) complexes with methacrylacetophenone was carried out by the exchange reaction between the equimolar amounts of lanthanide nitrates and Na(mphpd) in a hydroalcoholic solution:
$$ \mathrm{N}\mathrm{d}\;{\left({\mathrm{NO}}_3\right)}_3+3\mathrm{N}\mathrm{a}\left(\mathrm{mphpd}\right)\to \mathrm{N}\mathrm{d}\;{\left(\mathrm{mphpd}\right)}_3+3{\mathrm{NaNO}}_3. $$
Synthesis of Nd(III) complexes with allyl acetoacetate was performed in a hydroalcoholic solution at pH = 8–9:
$$ \mathrm{N}\mathrm{d}{\left({\mathrm{NO}}_3\right)}_3+3\mathrm{H}\left(\mathrm{alacac}\right)\to \mathrm{N}\mathrm{d}{\left(\mathrm{alacac}\right)}_3+{\mathrm{HNO}}_3. $$

The kinetics of polymerization of obtained monomeric complexes was studied by dilatometric method.

A calibrated dilatometer with a volume of 3.594 mL made of heat-resistant glass was put into a water jacket equipped with a UT-15 thermostat. The temperature of heat carrier (distilled water) was controlled with a TL-6 thermometer (measuring accuracy ±0.1 °C). The volume change was measured with a KM-6 cathetometer (measuring accuracy ±0.001 mm). The passed time of the reaction was measured with a stopwatch. The accuracy of time measurement does not exceed 1 s during 30 min. To prepare the solution of monomer, 0.05 mol of monomeric complex, 5 mL of dimethylformamide, and 2,2′-azo-bis(isobutyronitrile) in amount of 1% w/w were put into a beaker and stirred until complete dissolution. The homogeneous solution thus obtained was transferred into the dilatometer with a long funnel. The dilatometer was attached to a vacuum pump and an argon tank by a three-way stopcock. The cooled dilatometer was firstly vacuumized and then filled with argon. This procedure was carried out three times. Prepared dilatometer filled with argon was sealed, and the reference point was set with the cathetometer at 20.0 °C. Afterwards, the dilatometer was put into the water jacket (the temperature of heat carrier was maintained at 80.0 °C) and the contraction of the solution was monitored with cathetometer. The time reading was started in a few minutes after the initial thermal expansion of liquid had finished. The stopwatch’s readings were taken in 1–5-min increments depending on the rate of contraction. After the polymerization had been completed, the dilatometer was taken out from the water jacket and put into ice-cold water. Its content was quantitatively transferred into a beaker with isopropyl alcohol to precipitate the polymeric complex. The precipitate was filtered off on a glass filter #16 and dried in a vacuum dryer at 40 °C to a constant mass.

The polymerization was carried out in 10 wt% dimethyl formamide (DMF) solution of monomers with 2,2′-azobisisobutyronitrile (AIBN) as free radical initiator (1 wt% with respect of monomers mass) at 80 °C for more than 10 h in thermostat. The polymerization mixture was poured into methanol. The solid precipitate was filtered, dissolved in DMF, reprecipitated into methanol, and then dried at 20 °C overnight. Copolymers with styrene and N-vinylcarbazole were obtained by free-radical copolymerization in 10 wt% DMF solution of monomers with AIBN as free-radical initiator (1 wt% with respect of monomers mass) at 80 °C for more than 8 h in thermostat. The polymerization mixture was poured into methanol. The solid precipitate was filtered, dissolved in DMF, reprecipitated into methanol, and then dried at 20 °C overnight (Fig.1).
Fig. 1

The fragments of copolymers structure (1) [Nd(mphpd)3]n[VK]m and (2) [Nd(mphpd)3]n[styrene]m

The complexes were studied using a number of physicochemical methods including chemical and thermal analyses, infrared (IR), absorption, luminescent spectroscopies, and dynamic light scattering.

Lanthanide percentage in the complexes was determined using Shimadzu ICPE-9000 atomic emission spectrometer. Thermogravimetry (TG) and differential thermal analysis (DTA) were performed on a Q-1500°D type derivatograph (F. Paulik, J. Paulik, L. Erdey system) in the temperature range from 20 to 800 °C (heating rate 5 °C/min) in a platinum crucible in the presence of anhydrous carrier Al2O3 in a static air atmosphere. IR spectra were recorded on a Spectrum BX II FT–IR spectrophotometer (Rerkin-Elmer) in the range from 400 to 4000 cm−1 in a KBr tablet. Electronic absorption spectra were recorded on Shimadzu UV-1800 spectrophotometer. Particle size determination was performed by dynamic light scattering on a ZetaSizer system (Malvern Instruments). Excitation and luminescence spectra of solid samples and solutions (10−3 M in CHCl3) were recorded on a Fluorolog FL 3-22 spectrofluorimeter (Horiba Jobin Yvon, 450 W Xe-lamp) using OS 11 filter. DSS-IGA020L InGaAs photoresistor (Electro-Optical Systems, Inc.) cooled to liquid nitrogen temperature was used as a radiation detector for the IR region. Excitation and luminescence spectra were corrected in accordance with the distribution of the radiation sensitivity of xenon lamp and photomultiplier. Powder microphotographs were taken on a Hitachi H-800 scanning electron microscope.

The increase of luminescence efficiency of metallopolymers and copolymers compared with monomers is caused by the absence of water molecules in the nearest coordination environment of the Nd3+ ion and an effective sensitization by polymeric matrix [19, 29]. It was established that all complexes are able to show effective luminescence. The luminescence intensity increases in the following series:
$$ \mathrm{N}\mathrm{d}{\left(\mathrm{mphpd}\right)}_3 < \kern0.37em {\left[\mathrm{Nd}{\left(\mathrm{mphpd}\right)}_3\right]}_{\mathrm{n}}\cdot {\left[\mathrm{VK}\right]}_{\mathrm{m}} < \kern0.37em {\left[\mathrm{Nd}{\left(\mathrm{mphpd}\right)}_3\right]}_{\mathrm{n}}\cdot {\left[\mathrm{styrene}\right]}_{\mathrm{m}} < \kern0.37em {\left[\mathrm{Nd}{\left(\mathrm{mphpd}\right)}_3\right]}_{\mathrm{n}}. $$

Results and Discussion

The kinetics of polymerization of obtained monomeric complexes was studied by dilatometric method, and kinetic parameters of radical polymerization of complexes were calculated: for Nd(alacac)3, the rate of polymerization is 1.52°× 10−4 mol/l s, the reduced rate of polymerization is 9.39 ×°10−4 s−1, and the total rate constant is 12.03°× 10−3 dm1.5/(mol0.5 s)1, respectively. The kinetic parameters of radical polymerization have very good agreement with literature data that the rate constant is somewhat overstated.

Thermal analysis of the complexes under study was performed in order to determine their hydrate composition. The decomposition of Nd(alacac)32H2O starts at 130 °C with the loss of one adsorbed and two coordinated water molecules (∆m = 8.65%, ∆m theor = 8.7%). The endothermic effects observed in the 188–562 °C range are due to the gradual loss of three allyl substituents (−CH2-CH = CH2): the first two detach at 188–487 °C and the third one, in the range of 487–562 °C, the weight loss is 20.9% (∆m theor = 20.4%). Further heating accompanied with a number of effects results in the complete decomposition of the organic part of the complex and formation of neodymium oxide (Fig. 2). The total weight loss in the temperature range studied is 40.3%.
Fig. 2

TG, DTG, and DTA curves of Nd(alacac)3 (a) and [Nd(alacac)3]n (b)

The profiles of TG and DTA curves for [Nd(alacac)3]n differ from those for the monomeric complex indicating different mechanisms of thermal decomposition. The endothermic effect at 132 °C is caused by dehydration of the metallopolymer, i.e., the loss of water molecules located in its cavities. The weight loss in the 192–602 °C range accompanied with a number of weak endothermic effects is due to both rearrangements and breaking of bonds between adjacent molecules in the polymeric matrix. Unfortunately, it is rather difficult to interpret the thermogram quantitatively since the molecular mass of metallopolymer is unknown. The total weight loss in the temperature range studied is 37.5%. It is notable that for the investigated ligands, there is only one main difference in mechanisms of decomposition: in the next stage after dehydration, in case of methacrylacetophenone complexes, one ligand molecule detaches at temperatures above 260 °C, whereas for allylacetoacetate complexes, the detachment of allyl substituent takes place above 300 °C.

The coordination mode of ligands to lanthanide ions was determined by IR spectroscopy (Fig. 2). The CO and CC stretching vibrations observed in the spectra in the 1500–1600 cm−1 region indicate the bidentate-cyclic coordination mode via carbonyl groups (Table 2). The band with the higher frequency (1590–1560 cm−1) is attributed mainly to a CO stretching and the band with the lower one (1540–1520 cm−1) to a CC stretching [30, 31]. In the spectra of the allyl acetoacetate complexes, the band of CO stretching is shifted towards higher wavenumbers compared to the corresponding methacrylacetophenone complexes. This shift is caused by electron density redistribution in the allyl acetoacetate molecules, and it may indicate the higher stability of the β-ketoesterate chelates compared to the β-diketonates. Weak shoulder at 1640–1650 cm−1 is attributed to a stretching of the C=C double bond in ligands. This band almost disappears in the spectra of metallopolymers due to polymerization and presence of only terminal unsaturated groups in them.
Table 2

Some distinctive characteristic band of metallic complexes and metallopolymers in the IR spectra


ν(M−O) + δchelate ring





422, 455, 486, 510, 555





418, 438, 458, 480,502, 522, 545,564,587




420,455, 500, 545, 570




460, 505, 540,555, 565, 570





406,415,426, 440, 450, 463, 484, 500, 560





420,445,460, 505, 570



The broad band of adsorbed and coordinated water molecules presents in the spectra of monomeric complexes in the 3200–3400 cm−1 region. The stretching vibrations of Nd–O bonds and chelate rings are observed in the 400–650 cm−1 region. It is notable that these bands have different intensity and width in the spectra of monomeric complexes, whereas for metallopolymers, they are split almost equally and have the same intensity. It indicates that all Nd–O bonds are equivalent in metallopolymer molecule and that the polymeric matrix has arranged structure.

The band maxima in the spectra of complexes are slightly shifted towards the long-wave region compared to the spectra of allylacetoacetate and methacrylacetophenone sodium salt (Table 2) indicating the weakening of the metal–ligand bond due to the complexation.

The electronic absorption and diffuse reflectance spectra of the neodymium complexes contain a number of bands corresponding to f-f transitions from the 4I9/2 ground state of the Nd3+ ion. From the band splitting, the coordination polyhedron in all complexes is assumed to be a square antiprism. The absorption spectra of metallopolymers are similar to the spectra of monomeric complexes. In the former, the bands are shifted by 10–250 cm−1 towards the long-wave region (Table 3) indicating the weakening of the metal–ligand bond in polymers and copolymers. Nevertheless, the profiles of the spectral bands and their splitting remain unchanged, which suggests the same coordination environment of the Nd3+ ions both in monomeric and polymeric complexes (Fig. 3).
Table 3

Electronic transitions in absorption spectra of neodymium compounds


Nd(mphpd)3, cm−1

[Nd(mphpd)3]n, cm−1

[Nd(mphpd)3]n[VK]m, cm−1

[Nd(mphpd)3]n[styrene]m, cm−1

4I9/2 → 2P1/2




4I9/2 → 4G9/2





4I9/2 → 4G7/2




4I9/2 → 2G7/2, 4G5/2





4I9/2 → 2H11/2





4I9/2 → 4F9/2





4I9/2 → 4F7/2





4I9/2 → 4H9/2





4I9/2 → 4F3/2



11,440, 11,390


Fig. 3

Absorption spectra of (1) Nd(mphpd)3 and (2) [Nd(mphpd)3]n

All complexes and metallopolymers were studied by electron microscopy (Fig. 4). Monomeric and polymeric complexes differ significantly. The structure of polymers becomes more ordered, and the successive bonding of monomer molecules into polymeric chains can be seen. The polymeric systems display the formation of net structures with a small agglomeration, which is typical for synthetic polymers. A certain similarity between the metallopolymers based on different ligands can also be noted. The particle size and the degree of agglomeration are greater in the copolymer systems. In the styrene-based copolymer, the globules are much larger in comparison with the N-vinylcarbazole copolymer, which is caused by steric factors.
Fig. 4

SEM image of powder 1—Nd(mphpd)3, 2—[Nd(mphpd)3]n, 3—[Nd(mphpd)3]n[VK]m, 4—[Nd(mphpd)3]n[styrene]m, 5—Nd(alacac)32H2O, and 6—[Nd(alacac)3]n; TEM image 7—film [Nd(mphpd)3]n and 8—powder [Nd(mphpd)3]n

The weakening of the lanthanide–ligand bond in the complexes compared with the aqua-ions and in the metallopolymer compared with monomeric methacrylacetophenone complex allows us to assume that the luminescence efficiency will increase in complexes and metallpolymers.

The excitation spectra of Nd(alacac)32H2O and [Nd(alacac)3]n in the solid state show a broad band in the 300–400 nm region with a maximum at 355 nm. Under excitation at this maximum, the 4f-luminescence typical for neodymium compounds is observed. The luminescence spectrum of Nd(alacac)32H2O (Fig. 5) contains the well-resolved peaks corresponding to the transitions from the excited 4F3/2 to the 4I9/2 (872, 877, 892, and 897 nm), 4I11/2 (1061 nm), and 4I13/2 (1330 nm) multiplets of ground level of the Nd3+ ion. The 4F3/2 → 4I11/2 transition band does not split, which indicates a fairly high symmetry of the complex and the presence of only one coordination center. The band of the 4F3/2 → 4I9/2 transition splits into four components, which means that the symmetry of the ligand field is not cubic. Under excitation at 355 nm band, the 4f-luminescence which is 1.2 times higher in intensity in comparison with the monomeric complex is observed for [Nd(alacac)3]n. The band maxima and splitting of the respective transitions (including the most intense 4F3/2 → 4I11/2 transition) remain almost unchanged, indicating the same coordination environment of the central ion in both compounds. The quantum yields of the 4f-luminescence are 0.00015 and 0.00018 for monomer and polymer, respectively. Although the luminescence intensity of the allyl acetoacetate complex is higher compared to methacrylacetophenone one [32], the luminescence efficiency is much lower due to the large difference between the energy of the ligand triplet and the Nd3+ resonance levels. Solution spectra could not be recorded because no emission bands were observed for the solutions of complexes in chloroform. In this regard, the study of copolymers based on allyl acetoacetate is not reasonable.
Fig. 5

Emission spectra of Nd(alacac)3 (1) and [Nd(alacac)3]n (2) in solid state (powder) T = 25 °C, λ = 362 nm

The excitation spectra of Nd(mphpd)3 and [Nd(mphpd)3]n in the solid state show a broad band in the 300–400 nm region with a maximum at 362 nm. The luminescence spectra of these compounds also display three transitions typical for the Nd3+ ion: 4F3/2 → 4I9/2 (875–902 nm), 4F3/2 → 4I11/2 (1061–1062 nm), and 4F3/2 → 4I13/2 (1330–1333 nm). The luminescence intensity for the metallopolymer is higher in comparison with the monomeric complex, probably due to the greater number of emitting centers.

The excitation spectrum of copolymer [Nd(mphpd)3]n[VK]m consists of a broad band in the 300–370 nm region with maximum at about 344 nm. In the case of [Nd(mphpd)3]n[styrene]m, there are two maxima in the excitation spectrum: at 317 nm and 360 nm. These bands are probably originated from π-electron transitions within coordinated ligand systems connected to a polymeric chain.

Being excited at the maxima of excitation spectra, the compounds show luminescence in the near IR region typical for neodymium compounds. In the emission spectra, three bands of the 4f-luminescence corresponding to transitions 4F3/2 → 4IJ (J = 9/2, 11/2, 13/2) of Nd3+ ion are observed (Figs. 6 and 7). The relative contribution of each band in the total integral intensity is 19.5, 69.9, and 10.6% for [Nd(mphpd)3]n[VK]m and 21.1, 68.5, and 10.4% for [Nd(mphpd)3]n[styrene]m. The 4F3/2 → 4I9/2 transition splits into two components: the maxima are at 877 and 899 nm for [Nd(mphpd)3]n[VK]m and 880 and 899 nm for [Nd(mphpd)3]n[styrene]m. The most intensive band in both copolymers corresponds to the 4F3/2 → 4I11/2 transition with the maximum at 1062 nm. The integral intensity of 4f-luminescence of [Nd(mphpd)3]n[VK]m is almost four times less than [Nd(mphpd)3]n[styrene]m. It was expected that the formation of a copolymer with vinylcarbazole units, which often act as a coordinating ligand [19, 33], will lead to an increase of the Nd3+-centered emission. But it was found that the integral intensity of the 4f-luminescence of [Nd(mphpd)3]n[VK]m is almost four times less than [Nd(mphpd)3]n[styrene]m. This phenomenon can be explained by the fact that vinylcarbazole units remain uncoordinated and do not take part in intramolecular energy transfer processes, since it was determined that the coordination mode of Nd3+ ions does not change from monomeric complex to copolymer. Another possible reason is the location of luminescent units in the microcavities of the polystyrene matrix exhibiting more disordered local environments due to the influence of the electric field of the surrounding polystyrene groups. Under this influence, the distortion of the symmetry around the Nd3+ ions leads to their polarization, which increases the probability for electronic dipole allowed transitions [34].
Fig. 6

Emission spectra of Nd(mphpd)3 (1), [Nd(mphpd)3]n (2), [Nd(mphpd)3]n[VK]m (3), and [Nd(mphpd)3]n[styrene]m (4) in solid state (powder) λ ex 1,2 = 362 nm, λ ex 3,4 = 350 nm

Fig. 7

Emission spectra of [Nd(mphpd)3]n in solution (1) and powder (2), λ ex =362 nm, T = 25 °C


To sum up, in the present work, a series of neodymium complexes and metallopolymers were synthesized and studied in the solid state and in solutions. As a result, the type of coordination was determined and the structure of coordination polyhedra was assumed. It is notable that the structure and symmetry of coordination polyhedra were found to depend only on ligand type and remain unchanged when going from monomer to metallopolymer or copolymer. Thus, the compounds based on β-ketoester allyl acetoacetate have a lower symmetry (C4 point group), while the complexes of β-diketone methacrylacetophenone belong to C4v group, which is caused by the nature of ligand and delocalized system of π-bonds in the chelate ring. The metallopolymers display certain orderliness due to the equivalence of bonds and their tendency to self-organization.







Dimethyl formamide


Differential thermal analysis






Scanning electron microscope







The authors acknowledge Nano Medical Technologies (NanoMedTech LLC) for technical support.


This study was funded by the National Taras Shevchenko University of Kyiv.

Authors’ Contributions

OB contributed to the synthesis of neodymium(III) complexes with 2-methyl-5-phenylpenten-1-3,5-dione and allyl-3-oxo-butanoate, investigation of their thermal properties, and interpretation of results. IS contributed to the synthesis of polycomplexes and copolymers with styrene and N-vinylcarbazole and investigations of their properties as reactivity in polymerization reactions and interpretation of results. NI contributed to the synthesis of neodymium(III) complexes with 2-methyl-5-phenylpenten-1-3,5-dione and allyl-3-oxo-butanoate and investigation of IR-spectral. OT contributed to the interpretation of results. NR contributed to the analysis of excitation and luminescence spectra of obtained metallocomplexes and polymers in solutions and solid state. SS contributed to the investigation of excitation and luminescence spectra of obtained metallocomplexes and polymers in solutions and solid state. OR contributed to the recording and investigation of SEM images of metallocomplexes and polymers. All authors read and approved the final manuscript.

Competing Interests

The authors declare that they have no competing interests.

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Authors’ Affiliations

V.I.Vernadsky Institute of General and Inorganic Chemistry, NASU
National Taras Shevchenko University of Kyiv
A.V. Bogatsky Physico-Chemical Institute, NASU


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