三元配合物RE(Et2dtc)3(phen)热化学性质的规律性

在无水乙醇中, 用铜试剂(NaEt₂dtc•3H₂O)和邻菲咯啉(o-phen•H₂O)分别与13种低水合氯化稀土合成了三元固态配合物(其中5种尚未见文献报道), 确定它们的组成可用通式RE(Et₂dtc)₃(phen)表示. IR光谱表明配合物中RE³⁺与3个NaEt₂dtc中的6个硫原子双齿配位, 同时与o-phen中的2个氮原子双齿配位. 用RD496-Ⅲ微量热计测定了298.15 K下13种水合氯化稀土盐及两个配体在无水乙醇中的溶解焓, 两个配体醇溶液的混合焓及13种化合物液相生成反应的焓变, 并通过合理的热化学循环, 求得了标题配合物的固相生成反应焓变; 测定了标题配合物298.15 K的比热容. 用RBC-II精密转动弹热量计测定了标题配合物的恒容燃烧热, 计算了它们的标准摩尔燃烧焓和标准摩尔生成焓. 发现系列配合物RE(Et₂dtc)₃(phen) (RE＝La, Pr, Nd, Sm～Lu)的多项热化学性质, 如低水合氯化稀土盐在无水乙醇中的溶解焓以及配合物的液相生成反应焓变和固相生成反应焓变、常温比热容、标准摩尔燃烧焓和标准摩尔生成焓都与稀土原子序数作图呈现“三分组现象”. 较集中地反映出配合物中RE³⁺与配体间的化学键有一定程度的共价性, 这是由于稀土离子5s²5p⁶轨道对4f电子的不完全屏蔽引起的.     

三元配合物RE [(Pdtc)3(phen)]热化学性质的规律性

Treatment of hydrate rare-earth(RE=La,Pr,Nd,Sm-Lu)chloride with ammonium pyrrolidinyldithiocarboxy-late(apdtc)and 1,10-phenanthroline(phen)gave rise to thirteen complexes with an empirical formulaRE[(pdtc)_3(phen)].The enthalpies of solution of hydrate rare-earth(RE= Sm-Ho,Tm-Lu)chloride,apdtc and phenin ethanol were measured by an RD-496 Ⅲ microcalorimeter at 298.15 K,along with the mixing enthalpy of etha-nol solution of APDC and that of phen and the enthalpies of reaction of formation of the title complexes in ethanol.The enthalpies of reaction of formation of the title complexes in solid were available through a rationally thermo-chemical cycle.Using an RD-496 Ⅲ microcalorimeter,a model was developed for calculating the specific heat ca-pacity and the responding specific heat capacity of the complexes were determined.The thermochemical properties,including the enthalpies of solution of hydrate rare earth chloride in ethanol,the enthalpies of reaction of formationof the title complexes in ethanol,the enthalpies of reaction of formation of the title complexes in solid,the specialheat capacities at room temperature,the standard molar enthalpies of combustion and the standard molar enthalpiesof formation for this series of complexes versus the atomic numbers of rare earth,presented triplet effect,which isrepresentative of certain covalent bond between RE and the ligands and the result of 4f electron not shielded fullyby 5s5p.     

微量热法测定RE(Et2dtc)3(phen)配合物的比热容

A calculation formula for determining the specific heat capacity of solid compound with an improved RD496-Ⅲ microcalorimeter was derived. The calorimetric constant and precision determined by the Joule effect were （63.901±0.030）μV/mW and 0.3% at 298.15 K, respectively, and the total disequilibrium heat has been measured by the Peltier effect. The specific heat capacities of two standard substances （benchmark benzoic acid and α-Al2O3） were obtained with this microcalorimeter, and the differences between their calculated values and literature values were less than 0.4%. Similarly, the specific heat capacities of thirteen solid complexes, RE（Et2dtc）3（phen） （RE=La, Pr, Nd, Sm-Lu, Et2dtc： diethyldithiocarbamate ion, phen： 1,10-phenanthroline） were gained, and their total deviations were within 1.0%. These values were plotted against the atomic numbers of rare-earth, which presents tripartite effect, suggesting a certain amount of covalent character in the bond of RE^3＋and ligands, according to Nephelauxetic effect of 4f electrons of rare earth ions.     

三元配合物Er(Et2dtc)3(phen)的热化学性质

三元配合物Er(Et2dtc)3(phen)的热化学性质;Er(Et2dtc)3(phen); 微量热法; 热动力学; 恒容燃烧能; 标准摩尔生成焓     

双核镉配合物Cd2(2，4-DAA)4(phen)2的溶剂热合成、晶体结构及电化学性质

羧酸配合物在磁学、光学、催化、生物等诸多领域有广泛的应用前景,羧酸配合物晶体材料的设计、合成、结构及性能的研究一直是人们研究的热点 [1].近年来,我们用刚性芳香羧酸构筑了一些羧酸配合 [2,3],但对于柔性芳香羧酸配体体系我们研究不多 [4].     

三元配合物Tb(Et2dtc)3(phen)的热化学性质

以铜试剂(NaEt2dtc•3H2O)和邻菲咯啉(o-phen•H2O) 与水合氯化铽(TbCl3•3.75H2O)在无水乙醇中制得了三元固态配合物.化学分析和元素分析确定其组成为Tb(Et2dtc)3(phen).IR光谱研究表明配合物中Tb3＋与NaEt2dtc中的硫原子双齿配位,同时与phen的氮原子双齿配位.用Calvet微热量计测定了298.15 K下液相生成反应的焓变ΔrHmθ(l),为(－21.819±0.055) kJ•mol－1,通过热化学循环计算了固相生成反应焓变ΔrHmθ(s),为(128.476±0.675) kJ•mol－1.改变反应温度,研究了液相生成反应的热动力学.用精密转动弹热量计测得配合物的恒容燃烧能ΔcU为(－17646.95±8.64) kJ•mol－1,经计算其标准燃烧焓ΔcHHmθ和标准生成焓ΔfHmθ分别为(－17666.16±8.64) kJ•mol－1和(－1084.04±9.49) kJ•mol－1.     

三元配合物Tm[(C5/sub>H8NS2)3(C12H8N2)]的热化学性质研究

在无水乙醇中，用吡咯烷二硫代氨基甲酸铵(APDTC)和1,10-邻菲咯啉(o-phen·H₂O)与TmCl₃·3.65H₂O作用，合成了未见文献报道的三元固态配合物，确定它的组成为Tm[(C_{5/sub>H8NS2)3(C12H8N2)]。 用RD496-Ⅲ微量热计测定了298.15 K下水合氯化铥及两个配体在无水乙醇中的溶解焓，两个配体醇溶液的混合焓及不同温度下标题化合物液相生成反应的焓变。在实验和计算基础上，得到了液相生成反应的热力学参数(活化焓、活化熵和活化自由能)，速率常数和动力学参数(表现活化能、频率因子和反应级数)。通过合理的热化学循环，求得了298.15 K时标题化合物的固相生成反应焓变；推导了用该热量计测定固态物质比热容的计算式，并测定了题目配合物298.15 K的比热容。用RBC-Ⅱ精密转动弹热量计测定了题目配合物的恒容燃烧热， 计算了它们的标准摩尔燃烧焓和标准摩尔生成焓。}     

氨基酸及其希土配合物的热化学性质研究

用转动弹热量计测定了ＣＬ－α－氨基正丁酸的燃烧能，换算它的标准生成焓。并且计算了组成为ＢＥＣｌ３．Ｂ２．５Ｈ２Ｏ（ＲＥ＝Ｅｕ，Ｇｄ，Ｄｙ，Ｅｒ，Ｙｂ，Ｙ；Ｂ＝α－氨基正丁酸）的固态配合物的标准生成焓。     

三元混配化合物［Cu(8-Q)2(phen)］·H2O及［Cu(NCS)2(phen)2］·H2O的固相合成

用室温固相反应合成了［Cu(8-Q)₂(phen)］·H₂O及［Cu(NCS)₂(phen)₂］·H₂O两个三元混配化合物。室温下［Cu(Ac)₂(H₂O)］与邻菲啉固体几乎不发生反应,但加入第二配体8-羟基喹啉及KSCN,反应几乎立即发生。XRD、IR谱及元素分析结果表明：第二配体的加入并不仅仅促进［Cu(Ac)₂(H₂     

三元配合物Ho(Et2dtc)3(phen)的合成及其热化学性质

改进文献方法,以铜试剂(NaEt2dtc·3H2O)和邻菲咯啉(o-phen·H2O)与低水合氯化钬(HoCl3·3.58H2O)在无水乙醇中反应,制得三元固态配合物.化学分析和元素分析确定该配合物的组成为Ho(Et2dtc)3(phen).IR光谱表明配合物中Ho3 与3个NaEt2dtc中的6个硫原子双齿配位,同时与o-phen中的2个氮原子双齿配位,可推测其配位数为8.用微量热量计测定了298.15 K下液相生成反应的焓变△rHm (1),为(-14.697±0.0376)kJ·mol-1,通过合理的热化学循环计算了固相生成反应焓变△rHm (s),为(117.504±0.619)kJ·mol-1;改变反应温度,研究了配合物的液相生成反应的热力学性质.配合物的恒容燃烧能△cU用精密转动弹热量计测定为(-18687.64±8.22)kJ·mol-1,其标准燃烧焓△cHm 和标准生成焓△fHm 经计算分别为(-18706.85±8.22)和(-70.01±9.37)kJ·mol-1.     

RE(Et2dtc)3(phen)(RE=La，Pr，Nd，Sm)的恒容燃烧能测定(英)

Four ternary solid complexes were synthesized with sodium diethyldithiocarbamate (NaEt₂dtc)(b), 1,10-phenanthroline (o-phen) (c) and hydrated lanthanide chlorides in absolute ethanol by an improved reported method. The complexes were identified as the general formula of RE(Et₂dtc)₃(phen) (RE=La, Pr, Nd, Sm) by chemical and elemental analyses. IR spectra of the complexes showed that the RE³⁺ was coordinated with sulfur atoms of NaEt₂dtc and nitrogen atoms of o-phen. The constant-volume combustion energies of complexes, Δ_cU, were determined by a precise rotating-bomb calorimeter at 298.15 K. The standard enthalpies of combustion, Δ_cH_m^?, and standard enthalpies of formation, Δ_fH_m^?, were calculated for these complexes, respectively.     

三元配合物Yb[(C5H8NS2)3(C12H8N2)]的热化学性质研究

在无水乙醇中, 用吡咯烷二硫代氨基甲酸铵(APDTC)和1, 10-邻菲咯啉(o-phen·H2O)与YbCl3·3.84H2O作用, 合成了三元固态配合物, 确定它的组成为Yb[(C5H8NS2)3(C12H8N2)]. 用RD496-Ⅲ微量热计测定了298.15 K下水合氯化镱及两个配体在无水乙醇中的溶解焓, 两个配体醇溶液的混合焓及不同温度下标题化合物液相生成反应的焓变; 得到了液相生成反应的热力学参数(活化焓、活化熵和活化自由能)和动力学参数(速率常数、表观活化能、频率因子和反应级数); 通过合理的热化学循环, 求得了298.15 K时标题化合物的固相生成反应焓变; 推导了用该热量计测定固态物质比热容的计算式, 并测定了该配合物298.15 K的比热容.     

Lu(Et2dtc)3(phen)的生成反应焓变、摩尔热容和恒容燃烧能测定

A ternary solid complex Lu(Et₂dtc)₃(phen) has been obtained from the reaction of hydrated lutetium chloride with sodium diethyldithiocarbamate (NaEt₂dtc), and 1,10-phenanthroline (o-phen·H₂O) in absolute ethanol. IR spectrum of the complex indicates that Lu³⁺ binds with sulfur atom in the Na(Et₂dtc)₃ and nitrogen atom in the o-phen. The enthalpy change of liquid-phase reaction of formation of the complex, Δ_rH_m^Ө (l), was determined to be (-32.821 ± 0.147 ) kJ·mol^-1 at 298.15 K by an RD-496 Ⅲ type heat conduction microcalormeter. The enthalpy change of the solid-phase reaction of formation of the complex, Δ_rH_m^Ө (s), was calculated to be (104.160 ± 0.168) kJ · mol^-1 on the basis of an appropriate thermochemistry cycle. The thermodynamics of liquid-phase reaction of formation of the complex was investigated by changing the temperature of liquid-phase reaction. Fundamental parameters, such as the activation enthalpy (ΔH_≠^Ө), the activation entropy (ΔS_≠^Ө), the activation free energy (ΔG_≠^Ө), the apparent reaction rate constant (k), the apparent activation energy (E), the pre-exponential constant (A) and the reaction order (n), were obtained by combination the reaction thermodynamic and kinetic equations with the data of thermokinetic experiments. The molar heat capacity of the complex, c_m, was determined to be (82.23 ± 1.47) J·mol^-1·K^-1 by the same microcalormeter. The constant-volume combustion energy of the complex, Δ_cU, was determined as (-17 898.228 ± 8.59) kJ·mol^-1 by an RBC-Ⅱtype rotating-bomb calorimeter at 298.15 K. Its standard enthalpy of combustion, Δ_cH_m^Ө, and standard enthalpy of formation, Δ_fH_m^Ө, were calculated to be (-17 917.43 ± 8.11) kJ·mol^-1 and (-859.95 ±10.12) kJ·mol^-1, respectively.     

配合物[Mn(bipy)3](ClO4)2的晶体结构和热分析研究

The complex [Mn(bipy)₃]·(ClO₄)₂ was synthesied and characterized by X-ray diffraction. X-ray diffraction result for the single crystal showed that the crystal belongs to triclinic, space group P1, a=0.8123(2),b=1.1024(2), c=1.8646(4)nm,α=102.30(3)°,β=91.00(3)°,γ=99.69(3)°,V=1.6056(6)nm³,Z=2,D_c=1.494g·cm^-3. The thermal decomposition of [Mn(bipy)₃](ClO₄)₂ occurred in a three steps pattern. The reaction mechanism of the first step decomposition was deduced as n(1-α)[-ln(1-α)](n-1)/n with the activation energy of 130kJ·mol^-1.     

三元配合物Dy（Et2dtc）3（phen）的热化学性质

以铜试剂(NaEt2dtc·3H2O)和菲咯啉(phen·H2O)与低水合氯化狄(DyCl3·3.74H2O)在无水乙醇中反应,制得三元固态配合物,化学分析和元素分析确定该化合物的组成为Dy(Et2dtc)3(phen)。IR光谱表明配合物中Dy3 与3个NaEt2dtc中的6个硫原子双齿配位,同时与phen中的2个氮原子双齿配位,可推测其配位数为8。用微热量计测定出298.15 K下液相生成反应的焓变A,H曼(1)为(一19.091±0.015)kJ·mol_。,通过合理的热化学循环计算出固相生成反应焓变△rHmθ(s)为(139.641±0.482)kJ·mol-1;改变反应温度,研究了配合物的液相生成反应的热动力学,配合物的恒容燃烧能△cU用精密转动弹热量计测定为(-16730.21±9.25)kJ·mol-1,其标准燃烧焓△fHmθ和标准生成焓△fHmθ经计算分别为(-16749.42±9.25)kJ·mol-1和(-2019.68±10.19)kJ·mol～1。     

混合价双核锰配合物[(bipy)2Mn(μ-O)2Mn(bipy)2](ClO4)3的合成晶体结构及性能

[Mn₃O(O₂CCH₂Cl)₆(C₅H₅N)₂(H₂O)]·CH₂ClCOO·H₂O在pH=4.5的HOAcNaOAc的缓冲水溶液中和2,2′联吡啶(bipy)反应,制得了混合价双核锰配合物[(bipy)₂Mn(μ-O)₂Mn(bipy)₂](ClO₄)₃·1.5H₂O。该配位化合物的X射线单晶衍射表明,该晶体属单斜晶系,空间群P2₁/c,晶胞参数:a=1.3854(3),b=1.3943(3),c=2.4225(5)nm,β=103.30°,V=4.554(2)nm³,Z=4,D_c=1.448g·cm^-3。其紫外可见光谱在640nm处有一个峰,可指派为桥配体O^2-到Mn(Ⅲ)的电荷迁移光谱.循环伏安实验说明,此配合物在半波电位E_1/2为1.25V处,有一个可逆的氧化还原峰,这相应于(Ⅲ,Ⅳ)态氧化为(Ⅳ,Ⅳ)态,另外在0.37V处有一阴极峰,相应于(Ⅲ,Ⅳ)态还原为(Ⅲ,Ⅲ)态,在0.81V处有一氧化峰,相应于(Ⅲ,Ⅲ)态氧化为(Ⅲ,Ⅳ)态,这两个峰是不可逆的。     

稀土配合物[Pr(C3H7NO2)2(C3H4N2)(H2O)](ClO4)3的标准生成焓及热分解动力学研究

合成了高氯酸镨和咪唑(C₃H₄N₂), DL-α-丙氨酸(C₃H₇NO₂)混配配合物晶体. 经傅立叶变换红外光谱、化学分析和元素分析确定其组成为[Pr(C₃H₇NO₂)₂(C₃H₄N₂)(H₂O)](ClO₄)₃. 使用具有恒温环境的溶解-反应量热计, 以2.0 mol•L^－1 HCl为量热溶剂, 在T＝(298.150±0.001) K时测定出化学反应PrCl₃•6H₂O(s)＋2C₃H₇NO₂(s)＋C₃H₄N₂(s)＋3NaClO₄(s)＝[Pr(C₃H₇NO₂)₂(C₃H₄N₂)(H₂O)](ClO₄)₃(s)＋3NaCl(s)＋5H₂O(1)的标准摩尔反应焓为Δ_rH_m^ө＝(39.26±0.11) kJ•mol^－1. 根据盖斯定律, 计算出配合物的标准摩尔生成焓为Δ_fH_m^ө{[Pr(C₃H₇NO₂)₂(C₃H₄N₂)(H₂O)](ClO₄)₃(s), 298.150 K}＝(－2424.2±3.3) kJ•mol^－1. 采用TG-DTG技术研究了配合物在流动高纯氮气(99.99%)气氛中的非等温热分解动力学, 运用微分法(Achar-Brindley-sharp和Kissinger法)和积分法(Satava-Sestak和Coats-Redfern法)对非等温动力学数据进行分析, 求得分解反应的表观活化能E＝108.9 kJ•mol^－1, 动力学方程式为dα/dt＝2(5.90×10⁸/3)(1－α)[－ln(1－α)]^－1exp(－108.9×10³/RT).     

配合物[Tb(p-ClBA)3(phen)]2的结构和性能

Terbium p-chlorobenzoate complex with 1,10-phenanthroline, [Tb(p-ClBA)₃(phen)]₂(1) has been obtained in the ethanol solution, where p-ClBA=p-chlorobenzoate and phen=1,10-phenanthroline. It crystallizes in the triclinic system, space group P1, a=1.008 1(2) nm, b=1.185 7(2) nm, c=1.431 1(3) nm, α=110.826(4)°, β=96.436(4)°, γ=101.737(4)°, Z=2. The two Tb(III) ions are linked by four carboxylate groups through their bidentate bridging modes, forming a dimeric unit with crystallographic inversion center. Each terbium ion has an eight-coordinate geometry with four of the coordination sites occupied by four oxygen atoms from the four bridging carboxylates, respectively, two oxygen atoms from bidentate carboxylate, and the remaining positions occupied by two nitrogen atoms from a 1,10-phenanthroline molecule. The Tb(III) ion adopt a distorted square antiprism coordination geometry. The excitation and luminescence data observed at room temperature show that the title complex emits very intensive green fluorescence under ultraviolet light. The result of thermal analysis indicates the complex [Tb(p-ClBA)₃(phen)]₂ is quite stable to heat. CCDC: 221921.     

三元稀土配合物RE(NTA)2AA的合成、共聚反应性及荧光性能研究

Four new ternary rare earth complexes RE(NTA)₂AA (RE=Sm³⁺， Eu³⁺， Tb³⁺， Dy³⁺) have been synthesized by the reaction of rare earth chloride(RECl₃·6H₂O) with Acrylic Acid (HAA) and 4，4，4-trifluoro-1-(3-pyridyl)-1，3-butanedione(NTA) in alcohol. The copolymerization of the complexes RE(NTA)₂AA (RE=Sm³⁺， Eu³⁺) with methyl methacrylate (MMA) has been studied by 2， 2-azobis-isobutyronitrile as an initiator. Influence of adding Eu(Ⅲ) and 2，2′-bipyridine(bipy) into copolymer Eu(NTA)₂AA-co-MMA on fluorescence property of the Eu copolymer was investigated. The compositions of the complexes and copolymer were characterized by means of elemental analysis and FTIR. The heat decomposing behaviors of the complexes were determined by TG-DTA. The glass transition temperature and molecular weight were obtained by DSC and GPC. The results of fluorescence properties show that the Eu， Sm complexes and Eu copolymer can efficiently emit fluorescence， but the Tb and Dy complexes only emit the fluorescence of β-diketone ligand.     

稀土配合物[Pr(C3H7NO2)2(C3H4N2)(H2O)](ClO4)3的标准生成焓及热分解动力学研究

合成了高氯酸镨和咪唑(C₃H₄N₂), DL-α-丙氨酸(C₃H₇NO₂)混配配合物晶体. 经傅立叶变换红外光谱、化学分析和元素分析确定其组成为[Pr(C₃H₇NO₂)₂(C₃H₄N₂)(H₂O)](ClO₄)₃. 使用具有恒温环境的溶解-反应量热计, 以2.0 mol•L^－1 HCl为量热溶剂, 在T＝(298.150±0.001) K时测定出化学反应PrCl₃•6H₂O(s)＋2C₃H₇NO₂(s)＋C₃H₄N₂(s)＋3NaClO₄(s)＝[Pr(C₃H₇NO₂)₂(C₃H₄N₂)(H₂O)](ClO₄)₃(s)＋3NaCl(s)＋5H₂O(1)的标准摩尔反应焓为Δ_rH_m^ө＝(39.26±0.11) kJ•mol^－1. 根据盖斯定律, 计算出配合物的标准摩尔生成焓为Δ_fH_m^ө{[Pr(C₃H₇NO₂)₂(C₃H₄N₂)(H₂O)](ClO₄)₃(s), 298.150 K}＝(－2424.2±3.3) kJ•mol^－1. 采用TG-DTG技术研究了配合物在流动高纯氮气(99.99%)气氛中的非等温热分解动力学, 运用微分法(Achar-Brindley-sharp和Kissinger法)和积分法(Satava-Sestak和Coats-Redfern法)对非等温动力学数据进行分析, 求得分解反应的表观活化能E＝108.9 kJ•mol^－1, 动力学方程式为dα/dt＝2(5.90×10⁸/3)(1－α)[－ln(1－α)]^－1exp(－108.9×10³/RT).