Coordination Behavior and Coligand‐Dependent  cis / trans  Isomerism of Calcium Bis(diphenylphosphanides) | Zendy

Langer Jens | Zendy; AlShboul Tareq M. A. | Zendy; Younis Fadi M. | Zendy; Görls Helmar | Zendy; Westerhausen Matthias | Zendy

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Coordination Behavior and Coligand‐Dependent cis / trans Isomerism of Calcium Bis(diphenylphosphanides)

Author(s) -

Langer Jens,

AlShboul Tareq M. A.,

Younis Fadi M.,

Görls Helmar,

Westerhausen Matthias

Publication year - 2011

Publication title -

european journal of inorganic chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.667

H-Index - 136

eISSN - 1099-0682

pISSN - 1434-1948

DOI - 10.1002/ejic.201100241

Subject(s) - chemistry , metathesis , salt metathesis reaction , salt (chemistry) , medicinal chemistry , stereochemistry , calcium , lewis acids and bases , crystallization , crystallography , catalysis , organic chemistry , polymerization , polymer

The salt metathesis reaction of KPPh 2 with CaI 2 and SrI 2 in THF yields the corresponding complexes [(THF) 4 Ae(PPh 2 ) 2 ] [Ae = Ca ( 1 ), Sr]. Depending on the crystallization conditions, cis ‐ or trans ‐[(THF) 4 Ca(PPh 2 ) 2 ] can be isolated. In solution, a fast equilibrium converts these isomers into each other leading to a single set of resonances in the NMR spectra. The THF ligands can be replaced by stronger Lewis bases, such as N ‐methylimidazole (MeIm), which leads to the formation of [(MeIm) 4 Ae(PPh 2 ) 2 ] [Ae = Ca ( 2a ), Sr ( 2b )]. The use of tetradentate hexamethyltriethylenetetramine (hmteta) fixes a cis configuration yielding [(hmteta)Ca(PPh 2 ) 2 ] ( 3 ). All compounds are very air and moisture sensitive, therefore a few crystals of the partially oxidized product [(hmteta)Ca(PPh 2 )(OPPh 2 )] ( 4 ) were also obtained.

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