C–H · · · O Hydrogen bonding in crystalline complexes carrying methylidyne (µ3-CH) and methylene (µ-CH2) ligands: a database study
Abstract
The relationship between the molecular and crystal structures of
organometallic complexes carrying methylidyne (µ
3
-CH) and
methylene (µ-CH
2
) ligands has been investigated on data
retrieved from the Cambridge Structural Database. It has been shown that
µ
3
-CH and µ-CH
2
groups participate in
intermolecular hydrogen-bonding networks of the
C–H · · · O
type involving, in most cases, the oxygen atoms of CO ligands as
acceptors. The order of decreasing acidity, judged on purely geometrical
grounds from the average length of the hydrogen-bonding interactions, is
roughly µ
3
-CH > µ-CH
2
.
These ligands establish
C–H · · · O
interactions which are comparable in length to those established by
hydrogen atoms bound to sp- and to sp
2
-hybridized carbon
atoms consistent with experimental and theoretical evidence.
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