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Synthesis and reactions of di, tri- and tetra-nuclear cationic complexes derived from bis(μ-methylenepentamethylcyclopentadienyl)dirhodium: the crystal structure of tetranuclear [{(C5Me5Rh-μ-CH2)2}2(μ-CN)2](PF6)2

Authors
Journal
Journal of Organometallic Chemistry
0022-328X
Publisher
Elsevier
Publication Date
Volume
405
Issue
3
Identifiers
DOI: 10.1016/0022-328x(91)86298-5

Abstract

Abstract The new di- or tri-nuclear cationic complexes [(C 5Me 5Rh-μ-CH 2) 2(Me)(L)]PF 6 (L  Me 3P, 2b: (MeO) 3P, 2c; MeNC, 2d; t-BuNC, 2e; C 5Me 5Rh(CO)(Me)(4-C 5H 4N), 2f; and C 5Me 5Ir(CO)(Me)(4-C 5H 4N), 2g), were made by displacement of acetonitrile by L in [(C 5Me 5Rh-μ-CH 2) 2(Me)(MeCN)]PF 6, 2a. Reaction of 2a with Hg(CN) 2 gave [{(C 5Me 5Rh-μ-CH 2) 2} 2(μ-CN) 2](PF 6) 2, bd4. A single crystal X-ray structure determination showed 4 to contain the unexpected feature of a tetranuclear cluster dication comprising two {(C 5Me 5Rh-μ-CH 2) 2} units, linked by two cyano ligands bridging two rhodiums, Reaction of [(C 5Me 5Rh-μ-CH 2) 2(Me) 2] withHg(Cn) 2 gave [(C 5Me 5Rh-μ-CH 2) 2(Me)(CN)].

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