Issue 27, 2006
From the journal:

Dalton Transactions

Synthesis and structural characterisation of heavy alkaline earth N,N′-bis(aryl)formamidinate complexes

Marcus L. Cole,ab   Glen B. Deacon,a   Craig M. Forsyth,a   Kristina Konstasa  and  Peter C. Junk*a  

* Corresponding authors

a School of Chemistry, Monash University, Victoria, Australia
E-mail: peter.junk@sci.monash.edu.edu.au
Fax: +61 (0)3 9905 4597

b School of Chemistry and Physics, The University of Adelaide, Adelaide, South Australia, Australia

Abstract

Treatment of calcium or strontium with 2.0 equivalents of N,N′-bis(o-methylphenyl)formamidine (o-TolFormH), N,N′-bis(2,6-dimethylphenyl)formamidine (XylFormH) or N,N′-bis(o-phenylphenyl)formamidine (o-PhPhFormH) in the presence of 1.0 equivalent of Hg(C6F5)2 in tetrahydrofuran (thf) affords the bis(formamidinate) complexes [Ca(o-TolForm)2(thf)2] (1), [Ca(XylForm)2(thf)2] (2), [Ca(o-PhPhForm)2(thf)2]·thf (3), [Sr(o-TolForm)2(thf)3] (4), [Sr(XylForm)2(thf)3]·3thf (5) and [Sr(o-PhPhForm)2(thf)3]·2thf (6). Analogous reactions with barium were generally unsatisfactory but [Ba(o-PhPhForm)2(thf)3]·2thf (7) was successfully prepared. Compounds 1–7 have been characterised by various spectroscopic methods (1H, 13C{1H} NMR and IR), elemental analyses and, for 1, 2 and 4–6, X-ray crystallography. The calcium complexes are monomeric and six-coordinate with either transoid octahedral or trigonal prismatic geometry, whilst the larger radius of strontium accommodates an additional thf solvent donor to give seven-coordinate structures with two types of coordination polyhedra.

Graphical abstract: Synthesis and structural characterisation of heavy alkaline earth N,N′-bis(aryl)formamidinate complexes

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Article information

DOI
https://doi.org/10.1039/B602210C
Article type
Paper
Submitted
14 Feb 2006
Accepted
13 Apr 2006
First published
27 Apr 2006

Dalton Trans., 2006, 3360-3367

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Synthesis and structural characterisation of heavy alkaline earth N,N′-bis(aryl)formamidinate complexes

M. L. Cole, G. B. Deacon, C. M. Forsyth, K. Konstas and P. C. Junk, Dalton Trans., 2006, 3360 DOI: 10.1039/B602210C

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