新型手性Salen双核锌配合物的分子识别研究

合成了新型手性Salen配体（H3L）及新型手性Salen双核锌配合物（主体）.通过研究主体对咪唑类客体及氨基酸酯类客体的分子识别行为,测定了这些配位反应的缔合常数.主体对咪唑类客体分子识别的缔合常数顺序为:K(Im) >K(2-MeIm) >K(2-Et-4-MeIm).主体对氨基酸酯类客体分子识别的缔合常数顺序为:K(LeuOCH3) >K(ValOCH3) >K(AlaOCH3) >K(SerOCH3),配位数均为2.主体与D、 L型氨基酸酯分子识别反应在不同温度下的缔合常数结果表明,随着温度的升高,对映选择性下降.实验发现反应体系中存在焓熵补偿关系. CD光谱的研究结果也反映了主体对不同客体识别能力的差异.     

手性锌卟啉与氨基酸酯的分子识别性能

通过紫外-可见光谱滴定法, 研究了手性锌卟啉配合物[p-(L-Leu)C2O-TPPZn]与手性氨基酸酯客体在CHCl3中的分子识别行为. 实验结果表明, D型氨基酸酯的缔合常数比L型的大, 且缔合常数按K(AlaOCH3)相似文献   

手性双核Salen配合物的谱学性质

合成了四个新型的手性双核(R,R)Salen配合物[(Cu)2L•H2O(2), (Ni)2L(3), (Zn)2L•H2O(4), (MnCl)2L•2H2O(5)], (其中L是由(R,R)环己二胺、 3,5-叔丁基水杨醛、 5,5’-亚甲基二水杨醛为原料合成的手性二聚Salen配体(1)).用元素分析、NMR、FT-IR、UV-Vis、CD光谱对配体和配合物进行了表征.在与单核的Salen配体和配合物比较的基础上，详细讨论了红外光谱、电子吸收光谱、圆二色光谱性质.发现双核配体和配合物的电子吸收光谱吸收峰的位置和形状与单核的配体和配合物基本一致，而吸收峰的强度有近似两倍的关系.另外， 用激子偶合理论解释了此类手性化合物圆二色谱的Cotton效应和Cotton分裂. Cotton分裂的方向依赖于环己二胺的构象.(R,R)环己二胺决定了Salen化合物的手征性为负， Cotton分裂的正负两部分分别处于高能区和低能区.     

手性铁尧镍席夫碱配合物的合成尧结构及其与DNA相互作用研究

以手性苯乙胺与吡啶醛缩合得到的含双齿或三齿配位基的手性席夫碱(L1、L2)为配体,合成了4对单核铁、镍手性对映体配合物fac-Λ-[M(R-L1)3](ClO4)2·3CH3CN(M=Fe,1R-Fe;M=Ni,1R-Ni),fac-Δ-[M(S-L1)3](ClO4)2·3CH3CN(M=Fe,1S-Fe;M=Ni,1S-Ni),[M(R-L2)2](ClO4)2(M=Fe,2R-Fe;M=Ni,2R-Ni),[M(S-L2)2](ClO4)2(M=Fe,2S-Fe;M=Ni,2S-Ni)。利用红外光谱(IR)、核磁共振氢谱(1H NMR)、元素分析(EA)、X-射线单晶衍射等手段对配合物结构进行了表征。对化合物1R-Fe,1R-Ni,1S-Ni,2R-Fe进行了晶体结构分析,其中1R-Fe,1R-Ni,1S-Ni结晶于P213手性空间群,金属中心与3个二齿配体(L1)提供的6个氮原子配位形成了扭曲变形的八面体结构;R型配体诱导配合物形成fac-Λ构型,而S型配体诱导配合物形成fac-Δ构型。2R-Fe结晶于P212121手性空间群,二价铁离子与2个三齿配体(R-L2)提供的6个氮原子配位形成了扭曲变形的八面体结构。利用紫外-可见吸收光谱、荧光猝灭光谱、圆二色谱等光谱分析法研究了配合物与DNA的相互作用。研究结果表明这4对手性配合物均能与小牛胸腺CT-DNA发生不同强度的结合,结合稳定常数从4.41×103 L·mol-1到1.88×104 L·mol-1。配合物与DNA的结合模式可能是通过静电作用与DNA骨架发生沟面结合。金属中心为铁的配合物表现出比相应的镍配合物更强的DNA作用力;而含三齿配体L2的配合物与DNA的作用均比相应的含二齿配体L1的配合物更强;S型配体形成的配合物与DNA的结合能力优于R型配体形成的配合物。     

手性铁、镍席夫碱配合物的合成、结构及其与DNA相互作用研究

以手性苯乙胺与吡啶醛缩合得到的含双齿或三齿配位基的手性席夫碱(L1、L2)为配体,合成了4对单核铁、镍手性对映体配合物fac-Λ-[M(R-L1)3](ClO4)2·3CH3CN(M=Fe,1R-Fe;M=Ni,1R-Ni),fac-Δ-[M(S-L1)3](ClO4)2·3CH3CN(M=Fe,1S-Fe;M=Ni,1S-Ni),[M(R-L2)2](ClO4)2(M=Fe,2R-Fe;M=Ni,2R-Ni),[M(S-L2)2](ClO4)2(M=Fe,2S-Fe;M=Ni,2S-Ni)。利用红外光谱(IR)、核磁共振氢谱(1H NMR)、元素分析(EA)、X-射线单晶衍射等手段对配合物结构进行了表征。对化合物1R-Fe,1R-Ni,1S-Ni,2R-Fe进行了晶体结构分析,其中1R-Fe,1R-Ni,1S-Ni结晶于P213手性空间群,金属中心与3个二齿配体(L1)提供的6个氮原子配位形成了扭曲变形的八面体结构;R型配体诱导配合物形成fac-Λ构型,而S型配体诱导配合物形成fac-Δ构型。2R-Fe结晶于P212121手性空间群,二价铁离子与2个三齿配体(R-L2)提供的6个氮原子配位形成了扭曲变形的八面体结构。利用紫外-可见吸收光谱、荧光猝灭光谱、圆二色谱等光谱分析法研究了配合物与DNA的相互作用。研究结果表明这4对手性配合物均能与小牛胸腺CT-DNA发生不同强度的结合,结合稳定常数从4.41×103 L·mol-1到1.88×104 L·mol-1。配合物与DNA的结合模式可能是通过静电作用与DNA骨架发生沟面结合。金属中心为铁的配合物表现出比相应的镍配合物更强的DNA作用力;而含三齿配体L2的配合物与DNA的作用均比相应的含二齿配体L1的配合物更强;S型配体形成的配合物与DNA的结合能力优于R型配体形成的配合物。     

手性配体2,5-二(4,5-蒎烯-2-吡啶)吡嗪及其铼配合物的合成与表征

本文报道了手性配体2,5-二(4,5-蒎烯-2-吡啶)吡嗪(L)及其铼配合物[Re(CO)3Cl(L)].DMF的合成与表征。X射线单晶衍射分析表明配体L晶体为单斜P21空间群,而配合物[Re(CO)3Cl(L)].DMF晶体为正交P212121空间群。配合物[Re(CO)3Cl(L)].DMF中铼原子与配体中的2个氮原子、3个羰基中的碳原子以及1个氯原子配位。CD谱和VCD谱测试表明,配体和配合物都表现出光学活性。受光激发时,配体和配合物分别在420和650 nm处发光。配体和配合物都具有二阶非线性光学性质,其二阶非线性光学效应分别为尿素的0.4和0.3倍。     

手性SalenCOⅡ配合物与氨基酸酯类客体的分子识别研究

用紫外-可见分光光度法研究了手性SalenCoⅡ配合物对4对对映异构的手性氨基酸酯类客体在CH2Cl2中的分子识别,发现手性SalenCoⅡ配合物与此类客体的配位数为1.各客体缔合常数均为KD＞KL,且按K(LeuOMe)＞K(AlaOMe)＞K(SerOMe)＞K(TyrOMe)的顺序依次减小,测定了识别过程的△rGmθ,△rHθm,△rSmθ,发现该反应是放热、熵减少的过程.采用分子力学的方法考察了主客体的最佳优势构象,对该优势构象进行量子化学计算,较好地解释了实验事实.     

手性SalenCOⅡ配合物与氨基酸酯类客体的分子识别研究

用紫外-可见分光光度法研究了手性SalenCoⅡ配合物对4对对映异构的手性氨基酸酯类客体在CH2Cl2中的分子识别,发现手性SalenCoⅡ配合物与此类客体的配位数为1.各客体缔合常数均为KD＞KL,且按K(LeuOMe)＞K(AlaOMe)＞K(SerOMe)＞K(TyrOMe)的顺序依次减小,测定了识别过程的△rGmθ,△rHθm,△rSmθ,发现该反应是放热、熵减少的过程.采用分子力学的方法考察了主客体的最佳优势构象,对该优势构象进行量子化学计算,较好地解释了实验事实.     

四-α-(2-甲基-8-喹啉氧基)酞菁金属配合物的合成、表征及光敏活性研究

利用DBU催化法合成得到4种两亲性的四-α-(2-甲基-8-喹啉氧基)酞菁金属配合物[金属＝Co(II), Ni(II), Cu(II), Zn(II)], 同时分别进行了元素分析、质谱、UV-Vis、IR光谱表征. 测定了它们在670 nm光激发下产生单线态氧的速率及光动力氧化氨基酸底物的速率常数, 探讨了它们光敏活性的构效关系.     

手性自旋转换铁(Ⅱ)席夫碱配合物的合成、结构及其磁性研究

通过高氯酸亚铁,4-(咪唑-2-甲醛)丁腈和光学纯苯乙胺衍生物的自组装成功合成了2个纯手性单核自旋转换铁(Ⅱ)化合物fac-Λ-[Fe(R-L1)3](Cl O4)2(1),fac-Λ-[Fe(R-L2)3](Cl O4)2(2)。利用X-射线单晶衍射、元素分析(EA)、红外光谱(IR)、核磁共振氢谱(1H NMR)、紫外光谱(UV)、圆二光谱(CD)等手段对配合物结构进行了表征。X-射线单晶衍射表明在化合物1和2中,铁(Ⅱ)金属中心与3个不对称双齿手性席夫碱配体中的6个氮原子配位形成八面体配位环境。每个结构基元中包含1个[Fe(L)3]2+阳离子和2个高氯酸根阴离子。由于铁(Ⅱ)中心周围手性配体的螺旋协调配位使[Fe(L)3]2+形成单一手性Λ构型。Fe(Ⅱ)-N键长表明配合物1和2中的铁(Ⅱ)在低自旋状态。在[Fe(L)3]2+中,相邻配体中的苯环和咪唑环形成分子内π-π相互作用。配合物1和2通过分子间C-H…π相互作用形成三维超分子结构。CD光谱证实配合物1和2在溶液中的光学活性。磁性测试表明配合物1和2分别在232和250 K发生自旋转换。由于配合物1和2具有相同的手性空间群和类似的堆积方式和分子间相互作用,导致1和2表现出不同自旋转换温度的原因主要是取代基效应。     

Accessibility and Selective Stabilization of the Principal Spin States of Iron by Pyridyl versus Phenolic Ketimines: Modulation of the (6)A(1) ↔ (2)T(2) Ground-State Transformation of the [FeN(4)O(2)](+) Chromophore

Several potentially tridentate pyridyl and phenolic Schiff bases (apRen and HhapRen, respectively) were derived from the condensation reactions of 2-acetylpyridine (ap) and 2'-hydroxyacetophenone (Hhap), respectively, with N-R-ethylenediamine (RNHCH(2)CH(2)NH(2), Ren; R = H, Me or Et) and complexed in situ with iron(II) or iron(III), as dictated by the nature of the ligand donor set, to generate the six-coordinate iron compounds [Fe(II)(apRen)(2)]X(2) (R = H, Me; X(-) = ClO(4)(-), BPh(4)(-), PF(6)(-)) and [Fe(III)(hapRen)(2)]X (R = Me, Et; X(-) = ClO(4)(-), BPh(4)(-)). Single-crystal X-ray analyses of [Fe(II)(apRen)(2)](ClO(4))(2) (R = H, Me) revealed a pseudo-octahedral geometry about the ferrous ion with the Fe(II)-N bond distances (1.896-2.041 ?) pointing to the (1)A(1) (d(π)(6)) ground state; the existence of this spin state was corroborated by magnetic susceptibility measurements and M?ssbauer spectroscopy. In contrast, the X-ray structure of the phenolate complex [Fe(III)(hapMen)(2)]ClO(4), determined at 100 K, demonstrated stabilization of the ferric state; the compression of the coordinate bonds at the metal center is in accord with the (2)T(2) (d(π)(5)) ground state. Magnetic susceptibility measurements along with EPR and M?ssbauer spectroscopic techniques have shown that the iron(III) complexes are spin-crossover (SCO) materials. The spin transition within the [Fe(III)N(4)O(2)](+) chromophore was modulated with alkyl substituents to afford two-step and one-step (6)A(1) ? (2)T(2) transformations in [Fe(III)(hapMen)(2)]ClO(4) and [Fe(III)(hapEen)(2)]ClO(4), respectively. Previously, none of the X-salRen- and X-sal(2)trien-based ferric spin-crossover compounds exhibited a stepwise transition. The optical spectra of the LS iron(II) and SCO iron(III) complexes display intense d(π) → p(π)* and p(π) → d(π) CT visible absorptions, respectively, which account for the spectacular color differences. All the complexes are redox-active; as expected, the one-electron oxidative process in the divalent compounds occurs at higher redox potentials than does the reverse process in the trivalent compounds. The cyclic voltammograms of the latter compounds reveal irreversible electrochemical generation of the phenoxyl radical. Finally, the H(2)salen-type quadridentate ketimine H(2)hapen complexed with an equivalent amount of iron(III) to afford the μ-oxo-monobridged dinuclear complex [{Fe(III)(hapen)}(2)(μ-O)] exhibiting a distorted square-pyramidal geometry at the metal centers and considerable antiferromagnetic coupling of spins (J ≈ -99 cm(-1)).     

Structure and photochemical properties of (mu-alkoxo)bis(mu-carboxylato)diruthenium complexes with naphthylacetate ligands

Two new dinuclear Ru(III) complexes containing naphthalene moieties, K[Ru2(dhpta)(mu-O2CCH2-1-naph)2] (1) and K[Ru2(dhpta)(mu-O2CCH2-2-naph)2] (2) (H5dhpta = 1,3-diamino-2-hydroxypropane-N,N,N',N'-tetraacetic acid, naph-1-CH2CO2H = 1-naphthylacetic acid, naph-2-CH2CO2H = 2-naphthylacetic acid), were synthesized. Complex 2 crystallized as an orthorhombic system having a space group of Pbca with unit cell parameters a = 10.6200(5) A, b = 20.270(1) A, c = 35.530(2) A, and Z = 8. EXAFS analysis of 1 and 2 in the solid states and in solution clarified that the dinuclear structures of 1 and 2 were kept in DMSO solutions. Variable-temperature magnetic susceptibility data indicated that the two Ru(III) centers are strongly antiferromagnetically coupled as shown by the large coupling constants, J = -581 cm(-1) (1) and -378 cm(-1) (2). In the cyclic voltammograms of 1 and 2, one oxidation peak and two reduction peaks which were assigned to the redox reaction of the ruthenium moieties were observed in DMF. The large conproportionation constants estimated from the reduction potentials of Ru(III)Ru(III) and Ru(III)Ru(II) indicated the great stability of the mixed-valent state. The mixed-valent species [Ru(III)Ru(II)(dhpta)(mu-O2CCH2-R)2](2-) (R = 1-naph (6) and R = 2-naph (7)) were prepared by controlled potential electrolysis of 1 and 2 in DMF. The electronic absorption spectra of 6 and 7 were similar to that of [Ru(III)Ru(II) (dhpta)(mu-O2CCH3)2](2-) which is a typical Class II type mixed-valent complex. The fluorescence decay of 1 and 2 indicated that there are two quenching processes which come from the excimer and monomer states. The short excimer lifetimes of 1 and 2 were ascribed to the energy transfer from the naphthyl moieties to the Ru centers. The different excimer ratio between 1 and 2 suggested that the excimer formation is affected by the conformation of the naphthyl moieties in the diruthenium(III) complexes.     

Diastereoselective fragmentation of chiral alpha-aminophosphonic acids/metal ion aggregates

Diastereomeric clusters of general formula [MAB(2)](+) and [MA(2)B](+) (M = Li(I), Na(I), Ag(I), Ni(II)-H, or Cu(II)-H; A = (R)-(-)- and (S)-(+)-(1-aminopropyl)phosphonic acid; B = (1R)-(-)- and (1S)-(+)-(1-aminohexyl)phosphonic acid) have been readily generated in the electrospray ionization (ESI) source of a triple-quadrupole mass spectrometer and their collision-induced dissociation (CID) investigated. CID of diastereomeric complexes, e.g. [MA(S)(B(S))(2)](+) and [MA(R)(B(S))(2)](+), leads to fragmentation patterns characterized by R(homo) = [MA(S)B(S)](+)/[M(B(S))(2)](+) and R(hetero) = [MA(R)B(S)](+)/[M(B(S))(2)](+) abundance ratios, which depend upon the relative stability of the diastereomeric [MA(S)B(S)](+) and [MA(R)B(S)](+) complexes in the gas phase. The chiral resolution factor R(chiral) = R(homo)/R(hetero) is found to depend not only on the nature of the M ion but also on that of the fragmenting species, whether [MAB(2)](+) or [MA(2)B](+). The origin of this behavior is discussed.     

Cobalt(II), nickel(II) and copper(II) complexes of a hexadentate pyridine amide ligand. Effect of donor atom (ether vs. thioether) on coordination geometry, spin-state of cobalt and M(III)-M(II) redox potential

Using an acyclic hexadentate pyridine amide ligand, containing a -OCH(2)CH(2)O- spacer between two pyridine-2-carboxamide units (1,4-bis[o-(pyrydine-2-carboxamidophenyl)]-1,4-dioxabutane (H(2)L(9)), in its deprotonated form), four new complexes, [Co(II)(L(9))] (1) and its one-electron oxidized counterpart [Co(III)(L(9))][NO(3)]·2H(2)O (2), [Ni(II)(L(9))] (3) and [Cu(II)(L(9))] (4), have been synthesized. Structural analyses revealed that the Co(II) centre in 1 and the Ni(II) centre in 3 are six-coordinate, utilizing all the available donor sites and the Cu(II) centre in 4 is effectively five-coordinated (one of the ether O atoms does not participate in coordination). The structural parameters associated with the change in the metal coordination environment have been compared with corresponding complexes of thioether-containing hexadentate ligands. The μ(eff) values at 298 K of 1-4 correspond to S = 3/2, S = 0, S = 1 and S = 1/2, respectively. Absorption spectra for all the complexes have been investigated. EPR spectral properties of the copper(II) complex 4 have been investigated, simulated and analyzed. Cyclic voltammetric experiments in CH(2)Cl(2) reveal quasireversible Co(III)-Co(II), Ni(III)-Ni(II) and Cu(II)-Cu(I) redox processes. In going from ether O to thioether S coordination, the effect of the metal coordination environment on the redox potential values of Co(III)-Co(II) (here the effect of spin-state as well), Ni(III)-Ni(II) and Cu(II)-Cu(I) processes have been systematically analyzed.     

Total spontaneous resolution of chiral covalent networks from stereochemically labile metal complexes

Stereochemically labile copper and zinc complexes with the N,N'-dimethylethylenediamine ligand (dmeda) have been shown to be promising precursors for the total spontaneous resolution of chiral covalent networks. (N,N')-[Cu(NO3)2(dmeda)]infinity crystallises as a conglomerate and yields either enantiopure (R,R)-1 or enantiopure (S,S)-1. A mixed-valence copper(I/II) complex, [{Cu(II)Br2(dmeda)}3(Cu(I)Br)2]infinity (2), which crystallises as a pair of interpenetrating chiral (10,3)-a nets, is formed from CuBr, CuBr2 and dmeda. One net contains ligands with solely (R,R) configuration and exhibits helices with (P) configuration while the other has solely (S,S)-dmeda ligands and gives rise to a net in which the helices have (M) configuration. The whole crystalline arrangement is racemic, because the interpenetrating chiral nets are of opposite handedness. With zinc chloride (R,S)-[ZnCl(dmeda)2]2[ZnCl4] (3) is obtained, which is a network structure, although not chiral. Total spontaneous resolution of stereochemically labile metal complexes formed from achiral or racemic building blocks is suggested as a viable route for the preparation of covalent chiral networks. Once the absolute structure of the compound has been determined by X-ray crystallography, a quantitative determination of the enantiomeric excess of the bulk product can be undertaken by means of solid-state CD spectroscopy.     

Optimizing small molecule activation and cleavage in three-coordinate M[N(R)Ar]3 complexes

The sterically hindered, three-coordinate metal systems M[N(R)Ar]3 (R = tBu, iPr; Ar = 3,5-C6H3Me2) are known to bind and activate a number of fundamental diatomic molecules via a [Ar(R)N]3M-L-L-M[N(R)Ar]3 dimer intermediate. To predict which metals are most suitable for activating and cleaving small molecules such as N(2), NO, CO, and CN(-), the M-L bond energies in the L-M(NH2)3 (L = O, N, C) model complexes were calculated for a wide range of metals, oxidation states, and dn (n = 2-6) configurations. The strongest M-O, M-N, and M-C bonds occurred for the d2, d3, and d4 metals, respectively, and for these d(n) configurations, the M-C and M-O bonds were calculated to be stronger than the M-N bonds. For isoelectronic metals, the bond strengths were found to increase both down a group and to the left of a period. Both the calculated N-N bond lengths and activation barriers for N2 bond cleavage in the (H2N)3M-N-N-M(NH2)3 intermediate dimers were shown to follow the trends in the M-N bond energies. The three-coordinate complexes of Ta(II), W(III), and Nb(II) are predicted to deliver more favorable N2 cleavage reactions than the experimentally known Mo(III) system and the Re(III)Ta(III) dimer, [Ar(R)N]3Re-CO-Ta[N(R)Ar]3, is thermodynamically best suited for cleaving CO.     

Effects of transition metal ion coordination on the collision-induced dissociation of polyalanines

Transition metal-polyalanine complexes were analyzed in a high-capacity quadrupole ion trap after electrospray ionization. Polyalanines have no polar amino acid side chains to coordinate metal ions, thus allowing the effects metal ion interaction with the peptide backbone to be explored. Positive mode mass spectra produced from peptides mixed with salts of the first row transition metals Cr(III), Fe(II), Fe(III), Co(II), Ni(II), Cu(I), and Cu(II) yield singly and doubly charged metallated ions. These precursor ions undergo collision-induced dissociation (CID) to give almost exclusively metallated N-terminal product ions whose types and relative abundances depend on the identity of the transition metal. For example, Cr(III)-cationized peptides yield CID spectra that are complex and have several neutral losses, whereas Fe(III)-cationized peptides dissociate to give intense non-metallated products. The addition of Cu(II) shows the most promise for sequencing. Spectra obtained from the CID of singly and doubly charged Cu-heptaalanine ions, [M + Cu - H](+) and [M + Cu](2+) , are complimentary and together provide cleavage at every residue and no neutral losses. (This contrasts with [M + H](+) of heptaalanine, where CID does not provide backbone ions to sequence the first three residues.) Transition metal cationization produces abundant metallated a-ions by CID, unlike protonated peptides that produce primarily b- and y-ions. The prominence of metallated a-ions is interesting because they do not always form from b-ions. Tandem mass spectrometry on metallated (Met = metal) a- and b-ions indicate that [b(n) + Met - H](2+) lose CO to form [a(n) + Met - H](2+), mimicking protonated structures. In contrast, [a(n) + Met - H](2+) eliminate an amino acid residue to form [a(n-1) + Met - H](2+), which may be useful in sequencing.     

An unusual asymmetric polyoxomolybdate containing mixed-valence antimony and its derivatives: [Sb4VSb2IIIMo18O73(H2O)2]12- and {M(H2O)2[Sb4VSb2IIIMo18O73(H2O)2]2}22- (M = MnII, FeII, CuII or CoII)

A new type of heteropolyanion containing mixed-valence antimony, [Sb4(V)Sb2(III)Mo18O73(H2O)2](12-) (1a), and its four derivatives, {M(H2O)2[Sb4(V)Sb2(III)Mo18O73(H2O)2]2}(22-) (M = Mn(II), Fe(II), Cu(II), or Co(II)) (2a-5a), have been isolated as ammonium salt, and their structures were determined by single-crystal X-ray diffraction. The framework of the polyanion 1a displays a curious asymmetric structure, and there exist six types of Sb coordination environments and seven types of {MoO6} octahedra. The title compounds were also characterized by elemental analyses, IR, UV-vis, Raman spectra, and cyclic voltammogramms.     

Preparation,characterization and thermal stability of poly[2-(Dimethylamino)ethyl acrylate]

Poly[2-(dimethylamino)ethyl acrylate] (PDAEA) and polymer complexes of 2-(dimethylamino)ethyl acrylate (DAEA) with nickel(II), copper(II), iron(III) and cobalt(II) chlorides were prepared and characterized by means of IR, electronic spectra and elemental analysis. The thermal stability of the homopolymer was compared with those of the polymer complexes, and the order of stability was given. The activation energies of the polymer complexes were calculated.