ISSN:
1573-9171
Keywords:
hexacoordinated tin compounds
;
synthesis
;
X-ray study
;
stereochemical nonrigidity
;
dynamic and multinuclear NMR spectroscopy
;
quantum-chemical calculations
;
MNDO
;
MNDOJPM3
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Previously unknown (0-Sn)-bischelated bis(lactamomethyl)dichlorostannanes have been synthesized by a direct method from metallic tin and N-chloromethyllactams. According to X-ray structural analysis data, in the solid state in these compounds the tin atom is hexacoordinated and has an octahedral configuration with the two carbon atoms in the transposition, and both coordinating oxygen atoms and the two halogen atoms in thecis-position. A comparison to Ge-analogs indicates that the replacement of the central atom of the coordination unit MCl2O2C2 has inconsistent effects on the parameters of the latter. According to1H and1191 Sn NMR data, the hexacoordination of tin and the geometry of the coordination unit are also retained in solution at low temperatures. At higher temperatures a dynamic process takes place resulting in isochronisms of the protons signals of the NCH2Sn groups. Quantum-chemical calculations of isomeric bis(lactamomethyl)dichlorostannanes by MNDO and MNDO/PM3 methods have been discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01431130
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