Premium
Structural Diversity of Coordination Cores in Homoleptic Tetraaryltin(IV) Dioxolane, Aldehyde and Imines: The First Octacoordinated Double Helicate Tetraorganotin(IV) Compound
Author(s) -
Barbul Ioana,
Varga Richard A.,
Silvestru Cristian
Publication year - 2013
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.201300245
Subject(s) - chemistry , homoleptic , tetracoordinate , coordination complex , stereochemistry , nuclear magnetic resonance spectroscopy , tin , heteroatom , crystallography , steric effects , coordination number , intramolecular force , medicinal chemistry , metal , organic chemistry , ring (chemistry) , computer graphics (images) , computer science , planar , ion
Reaction of [2‐{(CH 2 O) 2 CH}C 6 H 4 ]Li with SnCl 4 in a 4:1 molar ratio afforded [2‐{(CH 2 O) 2 CH}C 6 H 4 ] 4 Sn ( 1 ), which was deprotected to give [2‐(O=CH)C 6 H 4 ] 4 Sn ( 2 ). Homoleptic [2‐(RN=CH)C 6 H 4 ] 4 Sn [R = Me 2 NCH 2 CH 2 ( 3 ), 2,4,6‐Me 3 C 6 H 2 ( 4 ), PhCH 2 ( 5 )] were obtained by condensation of 2 with the corresponding amine either in solution or by using a green, solvent‐free procedure for (imino)arylmetal species. All compounds were characterised by multinuclear NMR spectroscopy and mass spectrometry, and their molecular structures were determined by single‐crystal X‐ray diffraction. In all cases, the C 4 Sn core is distorted tetrahedral as a result of the combined effects of the intramolecular coordination of the heteroatoms from the organic ligands and the steric impediments imposed by the ligands. The overall coordination around tin was found to be different, that is, coordination numbers from six for 1 and 4 , to seven for 3 and 5 and eight for 2 . Compound 2 is the first example of a mononuclear tetraorganotin(IV) compound that contains an octacoordinated metal centre with a double helicate topology in the solid state. Multinuclear NMR spectroscopy studies in solutions of CDCl 3 are consistent with equivalent organic groups attached to a tetracoordinate tin atom.