METALLABORANE REACTION CHEMISTRY - MACROPOLYHEDRAL METALLAHETEROBORANE SYNTHESIS BY DIRECT HETEROATOM INSERTION - FORMATION OF THE 20-VERTEX [(ETA(5)-C5ME5)IRB18H19S](-) ANION FROM 19-VERTEX SYN-[(ETA(5)-C5ME5)IRB18H20]
Sl. Shea et al., METALLABORANE REACTION CHEMISTRY - MACROPOLYHEDRAL METALLAHETEROBORANE SYNTHESIS BY DIRECT HETEROATOM INSERTION - FORMATION OF THE 20-VERTEX [(ETA(5)-C5ME5)IRB18H19S](-) ANION FROM 19-VERTEX SYN-[(ETA(5)-C5ME5)IRB18H20], INORGANIC CHEMISTRY COMMUNICATIONS, 1(3), 1998, pp. 97-100
Syn-[(eta(5)-C5Me5)IrB18H20] (1), from [(IrCl2(eta(5)-C5Me5)(2)] and s
yn-B18H22 with base. consists of nido-type twelve-vertex (IrB11) and t
en-vertex (B-10) subclusters fused with a common (B-3) triangular face
. Reaction of 1 with excess elemental sulfur and base results in the g
eneration of the iridathiaborane anion [(eta(5)-C5Me5)IrB18H19S](-) (2
), which consists of a nido-type twelve-vertex (IrB11) subcluster and
an arachno-type ten-vertex (SB9) subcluster fused with a (B-2) edge in
common. The reductive addition of electron-rich sulfur results in a l
oss in the degree of intimacy of the intercluster fusion together with
a nido --> arachno conversion of the non-metalla subcluster character
. (C) 1998 Elsevier science S.A. All rights reserved.