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一系列〔Co(acac)_2L〕~+型络合物〔acac=2,4戊二酮离子,L表示R~1R~2NCH_2CH_2NR~8R~4(R~1-R~4=H,CH_3)〕利用〔Co(acac)-3〕和二胺配位体在甲醇溶媒中进行反应而被合成。本文合成的所有络合物的纯化都是采用以SP—Sephadex C—25为交换剂的柱状色谱而进行的。而A(S)—异构体和A(R)—异构体的分离是采用以SE-Toyopearl为交换剂的柱状色谱而进行的。络合物的异构体的结构是基于~1H核磁共振(~1HNMR)和圆偏光二色性(CD)光谱而确定的。所有络合物的第一吸收带都在16600—18300cm~(-1)范围,表明~1A_1g→~1T_1g(O_h)的跃迁。本文所研究的二胺配位体的配位场强度依下面顺序减弱。 en>Me-en>N,N’-Me_2-en>N,N-Me_2-en>Me_3en>Me_4en。 Me-en,N,N’-Me_2en,Me_3en络合物的异构体在温度为25℃,pH=12.1的条件下,达到平衡且异构体在平衡状态下的分布是采用逆相高速液体色谱技术进行测定的。
A series of [Co (acac) 2L] ~ + complexes [acac = 2,4 pentanedionate and L represents R ~ 1R ~ 2NCH_2CH_2NR~8R~4 (R~1-R~4 = H, CH_3) ] Was synthesized by reacting [Co (acac) -3] and a diamine ligand in a methanol solvent. All complexes synthesized herein were purified by column chromatography using SP-Sephadex C-25 as an exchange reagent. The separation of the A (S) -isomer and the A (R) -isomer was carried out by column chromatography using SE-Toyopearl as a medium. The structure of the isomers of the complex was determined based on ~ 1H NMR (~ 1H NMR) and circularly polarized dichroism (CD) spectra. The first absorption bands of all the complexes are in the range of 16600-18300cm -1, indicating the transition of ~ 1A_1g → ~ 1T_1g (O_h). The ligand field strength of the diamine ligand studied in this paper is weakened in the following order. en> Me-en> N, N’-Me_2-en> N, N-Me_2-en> Me_3en> Me_4en. The isomers of Me-en, N, N’-Me_2en, Me_3en complexes reach equilibrium under the condition of temperature of 25 ℃ and pH = 12.1, and the distribution of isomers under the equilibrium state is obtained by using reverse phase high-speed liquid Chromatography techniques were measured.