结晶学
化学
八面体
群(周期表)
晶体结构
Atom(片上系统)
金属
金属间化合物
主组元素
铱
星团(航天器)
配体(生物化学)
立体化学
过渡金属
催化作用
生物化学
受体
计算机科学
嵌入式系统
程序设计语言
有机化学
合金
作者
Michael I. Bruce,N.N. Zaitseva,Brian W. Skelton,Neil Somers,Allan H. White
摘要
The crystal and molecular structures of five complexes [M2m4(C≡ CR)8(PPh3)2] (M = Rh, Ir; m = Cu, Ag; R = Ph, Fc (Ir/Cu only)) are described. Each consists of an approximately octahedral arrangement of the six metal atoms, with atoms M occupying opposite apical positions and atoms m forming an approximate plane. Four alkynyl groups are σ-bonded to each M. Two of these, one from each M, also interact by an asymmetric π-bonding mode with each atom m. Each M is also coordinated to one PPh3 ligand. The M–m distances range between 2.7698(9) and 3.2050(9) Å, although average values fall within the tight ranges 2.86(8) and 2.90(5) (m = Cu) or 3.06(5), 3.09(9) Å (m = Ag). Formally non-bonding M ··· M distances range between 4.1511(8) and 4.654(1) Å, while the shorter m ··· m separations range between 2.659(1) and 2.918(2) Å, which suggests that only weak intermetallic bonding exists. Both the geometries of these complexes and their intense colours suggest that the M2m4 cluster formulation is a major contributor to the structure, rather than a more simplistic, formally zwitterionic assemblage of two [M(C≡ CR)4(PPh3)]2− centres held together by the four m+ cations.
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