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Issue 2, 2015
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Unprecedented silicon(II)→calcium complexes with N-heterocyclic silylenes

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Abstract

The first N-heterocyclic silylene (NHSi) complexes of any s-block element to date are reported for calcium: [(η5-C5Me5)2Ca←:Si(O-C6H4-2-tBu){(NtBu)2CPh}] (6) and [(η5-C5Me5)2Ca←:Si(NtBuCH)2] (7). Complexes 6 and 7 are isolable in a facile way upon reaction of the corresponding free N-heterocyclic silylenes (NHSis) with [(η5-C5Me5)2Ca] (2). Complexes 6 and 7 were fully characterised by spectroscopic means and the single crystal X-ray diffraction analysis of 6 is also reported. Analysis of the bonding situation by DFT methods including a Bader Atoms in molecules (AIM) analysis is also reported. The bonding interaction between the Si and Ca centres in complexes 6 and 7 can best be viewed as σ-donor–acceptor interactions, with a considerable ionic contribution in the bond. The reactivity towards the oxygen containing substrates THF and benzophenone is also discussed.

Graphical abstract: Unprecedented silicon(ii)→calcium complexes with N-heterocyclic silylenes

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Publication details

The article was received on 13 Oct 2014, accepted on 03 Nov 2014 and first published on 04 Nov 2014


Article type: Paper
DOI: 10.1039/C4DT03148B
Citation: Dalton Trans., 2015,44, 639-644
  • Open access: Creative Commons BY license
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    Unprecedented silicon(II)→calcium complexes with N-heterocyclic silylenes

    B. Blom, G. Klatt, D. Gallego, G. Tan and M. Driess, Dalton Trans., 2015, 44, 639
    DOI: 10.1039/C4DT03148B

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