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Highly‐Reduced Metal Carbonyls
Author(s) -
Beck Wolfgang
Publication year - 1991
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199101681
Subject(s) - metal carbonyl , metal , chromium , chemistry , treasure , inorganic chemistry , organic chemistry , philosophy , theology
Carbonyl metalates contain metals with formally negative oxidation numbers — that has been known since the days of Walter Hieber. Nevertheless, an ion like [Cr(CO) 4 ] 4⊖ , which contains chromium(− IV ), was considered inaccessible, although it obeys the 18‐electron rule. Through the activities of John E. Ellis and coworkers (see also p. 194 in this issue) the treasure‐chest of mononuclear metal carbonyls was enriched by many such jewels. Further gaps were systematically filled with [M(CO) 6 ] 2⊖ , M Ti, Zr, Hf and [M(CO) 5 ] 3⊖ , M = V, Nb, Ta. The highly reduced metal carbonyls are not only interesting with regard to bonding theory, but are also useful as precursors in the synthesis of multinuclear complexes.