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A Class of Trinuclear Clusters with Carbonyl Bridging
Author(s) -
Pinhas Allan R.,
Albright Thomas A.,
Hofmann Peter,
Hoffmann Roald
Publication year - 1980
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19800630105
Subject(s) - chemistry , bridging (networking) , carbyne , molecule , carbene , stereochemistry , crystallography , bridging ligand , crystal structure , catalysis , organic chemistry , computer network , computer science
The impetus for this work was the structure of a trinuclear complex with two carbonyl groups showing incipient triple bridging ‐ Cp 2 Rh 3 (CO) 4 − . Its structure, barrier to rotation of one Rh(CO) 2 − piece vs. the rest of the molecule, and the nature of the bridging carbonyl interaction are analyzed. Isolobal analogies form an interesting connection between this complex and a bridged isomer of the recently synthesized carbene complexes, Cp 2 Rh 2 (CO) 2 CR 2 , one isomer of Cp 2 Rh 3 (CO) 3 , and hypothetical carbyne complexes Cp 2 Rh 2 (CO) 2 CH +,− . A general bonding model for Cp 2 Rh 2 (μ‐CO) 2 X complexes is constructed. The model, rich in geometrical detail, allows minima for the bridging carbonyl groups bending toward and away from the bonded ligand X.