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[Co(2,6-diaminomethylpyridine)(2-methylethylenediamine)Cl][ZnCl_4]体系中几何经式异构体的合成、结构解析和稳定性研究 被引量:5

Synthesis, Structures and Stability of the Geometric Meridional Isomers in [Co(2,6-diaminomethylpyridine)(2-methylethylenediamine)Cl][ZnCl4]
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摘要 合成了 [Co(bamp)(cmen)Cl]2+ (bamp=2,6-二甲胺基吡啶; cmen=1,2-二胺基丙烷 )体系的两个经式异构体。利用一维及二维核磁共振 (2D NMR)技术,结合三元胺中吡啶环的磁屏蔽效应,对两个异构体在溶液中的结构进行了解析,对应于 Dowex 50Wx 2柱色层分离的第一色带的阳离子为 m2(cmen的 2位胺基与 Cl处于邻位 );第二色带的阳离子为 m1。由第一色带配合物制备的单晶晶体结构解析也表明其为 m2[ZnCl4]。用量子化学从头计算方法,在赝势基组 RHF/LANL2DZ的水平上研究了该体系两个经式几何异构体的稳定性,结果表明后者较前者稳定,但差别不大,与在合成条件下异构体平衡分布一致。由计算得到的几何优化键参数与晶体结构分析结果能较好地吻合。 :The crystal structures of a pair of [Co(N-(3-Aminopropyl)-1,3-propanediamine)(2-(Aminomethyl)pyridine)Cl]2+ epimers have been determined. The crystals with the anti-epimers are monoclinic, space group C2/c with four molecules in the unit cell of dimensions a=2.7663(7)nm, b=0.9505(1)nm, c=1.8288(4)nm,β =05.57(2)°, V=4.632(1)nm3, Dc=1.706g· cm-3, Z=8, F000=2432.00,μ (MoKα )=23.51cm-1, R=0.033, Rw=0.041。 The crystals of the syn-epimer (the NH proton in 3,3-tri refers to chloro in the complex) are triclinic, space group with two molecules in a unit cell of dimensions a=1.0790(2)nm, b=1.1749(1)nm, c=0.8920(1)nm,α =90.73(1)°,β =109.573(9)°,γ =80.60(1)°, V=1.050.0(2)nm3, Dc=1.71g· cm-3, Z=2, F000=548.00,μ (MoKα )=25.73cm-1, R=0.022, Rw=0.030.
出处 《无机化学学报》 SCIE CAS CSCD 北大核心 2001年第1期65-69,共5页 Chinese Journal of Inorganic Chemistry
关键词 钴(III)配合物 差向异构体 晶体结构 合成 过氧 Cobalt(III)complexes epimers crystal structures
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