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η 2 (π)‐Coordination of a Bis‐Phosphonio‐Benzophospholide Cation: A Novel Complexation Mode for Unsaturated Phosphorus Heterocycles
Author(s) -
Gudat Dietrich,
Häp Stefan,
Nieger Martin
Publication year - 2001
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200109)627:9<2269::aid-zaac2269>3.0.co;2-i
Subject(s) - chemistry , moiety , tetraphenylborate , stereochemistry , crystal structure , medicinal chemistry , crystallography , phosphorus , chelation , organic chemistry , ion
The bis‐phosphonio‐benzo[c]phospholide tetraphenylborate 4 [BPh 4 ] reacts with CpCo(C 2 H 4 ) 2 to form a chelate complex [Co(η 5 –Cp)(κ 2 P ,η 2 (P=C) –4 )][BPh 4 ] ( 6 [BPh 4 ]) which was characterized by means of spectroscopic techniques and a single crystal X‐ray diffraction study. The observed η 2 (π)‐coordination of the benzophospholide moiety in the cation 6 is highly unusual for aromatic phosphorus heterocycles. The structural data suggest a pronounced coordination‐induced localization of π‐electrons in the condensed ring system.