
TY  - JOUR
A1  - Bruce, Michael I. 
A1  - Zaitseva, Natasha N. 
A1  - Skelton, Brian W. 
A1  - Somers, Neil 
A1  - White, Allan H. 
T1  - Crystal and Molecular Structures of Some Alkynyl&#8211;Group 9/Group 11 Complexes [M<emph type="8">2</emph>m<emph type="8">4</emph>(C<emph type="8">2</emph>R)<emph type="8">8</emph>(PPh<emph type="8">3</emph>)<emph type="8">2</emph>] (M = Rh, Ir; m = Cu, Ag; R = Ph, Fc (Ir/Cu only))
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 2003
VL  - 56
IS  - 5
SP  - 509
EP  - 516
KW  - 
UR  - https://doi.org/10.1071/CH02094 
N2  - The crystal and molecular structures of five complexes [M2m4(C&#8801; 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 &#963;-bonded to each M. Two of these, one from each M, also interact by an asymmetric &#960;-bonding mode with each atom m. Each M is also coordinated to one PPh3 ligand. The M&#8211;m distances range between 2.7698(9) and 3.2050(9) &#197;, although average values fall within the tight ranges 2.86(8) and 2.90(5) (m = Cu) or 3.06(5), 3.09(9) &#197; (m = Ag). Formally non-bonding M &#183;&#183;&#183; M distances range between 4.1511(8) and 4.654(1) &#197;, while the shorter m &#183;&#183;&#183; m separations range between 2.659(1) and 2.918(2) &#197;, 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&#8801; CR)4(PPh3)]2&minus; centres held together by the four m+ cations. 
ER  -

