Nitrosyl ligand related metal polyhedron isomerism; syntheses of [N(PPh3)2][Ru5C(CO)13(NO)(AuPR3)](R = Et, Ph) and the X-ray structure analysis of [Ru5C(CO)13(NO)(µ3-AuPEt3)] and [Ru5C(CO)13(NO)(µ2-AuPEt3)] in one crystal

Abstract
The new nitrosyl monoanion [Ru5C(CO)13(NO)](1) has been prepared by reaction of [Ru5C(CO)15] with [NO2], and it reacts with [AuPR3]+(R = Et, Ph) to give [Ru5C(CO)13(NO)(AuPR3)]; X-ray structure analysis of one of these compounds [Ru5C(CO)13(NO)(AuPEt3)](2) shows that it exists as isomers (2A) and (2B) which differ in the bonding mode of the Au ligand and in its site relative to the nitrosyl ligand.

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