ELECTRON SPIN RESONANCE STUDIES OF THE STRUCTURE OF TRIARYLTIN RADICALS (ESR, ARYLTIN, SYNTHESIS).
Item
-
Title
-
ELECTRON SPIN RESONANCE STUDIES OF THE STRUCTURE OF TRIARYLTIN RADICALS (ESR, ARYLTIN, SYNTHESIS).
-
Identifier
-
AAI8614671
-
identifier
-
8614671
-
Creator
-
EL-HEFNAWI, SOBHY ABDEL HAMID.
-
Contributor
-
Fitzgerald B. Bramwell
-
Date
-
1986
-
Language
-
English
-
Publisher
-
City University of New York.
-
Subject
-
Chemistry, Physical
-
Abstract
-
Electron spin resonance (ESR) spectra of isotopically enriched (('119)Sn) triphenyltin, triparatolyltin and triorthotolyltin radicals in rigid glass solution are reported at 4 K and 93 K. Radicals were generated by visible light photo-oxidation of triaryltin anions. Anions were synthesized by alkali metal reduction of tetraryltin in 2-methyltetrahydrofuran.;The isotropic and anisotropic hyperfine splitting have been determined using the Breit-Rabi equation. From this data we have used a semi-empirical approach to estimate the "S" and "P" character of the orbital containing the unpaired electron, the extent of hybridization, the ligand-tin-ligand bond angle, (PHI), and the ligand-symmetry axis complementary angle, (THETA), (out-of-plane bond angle).;From an analysis of the spectra, the following conclusions were drawn: triphenyltin and triparatolyltin radicals appear to be relatively stable, pyramidal structures with ligand-tin-ligand bond angles of 114.6(DEGREES), and 114.8(DEGREES), respectively. Ligand-symmetry axis complementary angles are 1.36(DEGREES), 13.4(DEGREES), respectively.;Triorthotolyltin radical appears to have a deeper pyramidal structure with a ligand-tin-ligand bond angle of 114.4(DEGREES) and a ligand-symmetry axis complementary angle of 13.9(DEGREES). These results are discussed in terms of limited tin-carbon multiple bonding and in terms of steric effects.
-
Type
-
dissertation
-
Source
-
PQT Legacy CUNY.xlsx
-
degree
-
Ph.D.
-
Program
-
Chemistry
