Ruthenium carbonyl clusters derived from pyrazolyl substituted diphosphazanes: Crystal and molecular structure of a triruthenium cluster featuring a triply bridging μ 3-η 1:η 1:η 1 coordination mode of pyrazolate moiety

Abstract

The radical initiated reactions of Ru 3(CO) 12 with pyrazolyl substituted diphosphazanes Ph 2PN(R)PPh(N 2C 3HMe 2-3,5) [R = ( S)-*CHMePh ( 1) or CHMe 2 ( 2)] proceed via P–N(pyrazole) bond rupture resulting in the formation of phosphido clusters, [Ru 3(CO) 5(μ sb-CO) 2(μ 3-N,N′-η 1:η 1:η 1-N 2C 3HMe 2-3,5){μ-P,P′-Ph 2PN(R)PPh}] [R = ( S)-*CHMePh ( 3) or CHMe 2 ( 4)]. The pyrazolate moiety adopts an unusual triply bridging μ 3-η 1:η 1:η 1-mode of coordination in these clusters.