Abstract
A series of dimesitylplatinum(ii) complexes of sym. substituted dimethyl-1,10-phenanthrolines (dmphen) was prepd. and examd. in view of their electronic structure. Electrochem. data of the parent complexes and spectroscopic data of parent and one-electron reduced species reveal the variable electronic influence of the Me substituents in different positions of the heteroarom. system. From multi-frequency S, X, K and Q-band EPR measurements of the corresponding radical anions and of analogous species with 1,10-phenanthroline, 3,4,7,8-tetramethyl-1,10-phenanthroline and 2,2'-bipyridine ligands hyperfine coupling consts. and g values were obtained and used for an estn. of the contributions from platinum orbitals to the singly occupied MO. X-Ray crystal structures are reported for (2,9-dmphen)PtMes2 and (2,9-dmphen)PtPh2, allowing us to probe the steric interactions between the Me substituents of the phenanthroline and the mesityl ligands. on SciFinder(R)
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