direction. All six compounds contain a linear chain of three CrII atoms wrapped by four unsymmetrical formamidinate anions. The terminal CrII atoms also have Cl anions. In 1–5a, the metal chains have relative long CrCr distance that are essentially equivalent (≈2.43–2.46 A) while in 5b the chain is very unsymmetrical with CrCr distances of 2.216(1) and 2.646(1) A. In all compounds, the separation between
摘要我们描述了四种类型为Cr3(ArPyF)4Cl2的化合物的制备和结构表征,其中ArPyF是不对称的甲ami酸盐ArNC(H)NPy,(Ar =苯基,1,对-茴香基(Ani),2,p -
甲苯基(Tol),3,对
氟苯基(PhF),4和两个式Cr3(PhPc)Cl2的区域异构体,其中PhPcF是苯基
吡啶甲基甲form的阴离子。在这些区域异构体之一中,
配体呈顺式构型5a,而在另一个5b中,三个苯环指向一个方向,第四个指向另一个方向,所有六个化合物均包含由三个CrII原子包裹着四个不对称甲酰胺酸根阴离子的线性链,末端CrII原子也具有Cl阴离子。在1–5a中,
金属链具有相对较长的CrCr距离,该距离基本相等(≈2.43–2。46 A),而在5b中,该链非常不对称,CrCr距离为2.216(1)和2.646(1)A。在所有化合物中,末端
铬原子之间的间隔明显更长(≈0.15-0.25A)在Cr3(dpa)4Cl2中(dpa