Structural aspects of platinum coordination complexes

Abstract

Structural parameters of over two thousand and five hundred platinum coordination complexes are outline. There is wide variety of mer, from mono-to nanomer. In these platinum is found in the oxidation states of zero, +1, +2, +3, and +4, and also nonintegral states of +0.5, +2.08, +2.14, +2.25, +2.5, +2.375, +2.75, +2.87, +3.25 and +3.5. There are also mixed-valence Pt(0)-Pt(II), Pt(I)-Pt(II), Pt(II)-Pt(III) and Pt(II)-Pt(IV). The most predominant state is Pt(II), with a square planar geometry and differing degree of distortion. In lower oxidation states (below 2), the Pt atoms are two, three and four coordinated, with the latter most prevails. The Pt(III) is mostly square-planar with some examples of trigonal bipyramidal arrangement. The Pt(IV) is mostly six-coordinated with various degree of distortion, there are examples of four-coordinated (square-planar). There is a wide variability of ligand types from uni-to hexadentate. The shortest Pt-Pt distance elongated in the order: 2.390(1) Å (Pt(III)-Pt(III)) < 2.492(1) Å (Pt(II)-Pt(II)) < 2.584(1) Å (Pt(2.5)-Pt(2.5)) < 2.619(4) Å (Pt(0)-Pt(0)) < 2.641(2) Å (Pt(0.5)-Pt(0.5)) < 2.699(1) Å (Pt(2.75)-Pt(2.75) < 2.724(2) Å (Pt(2.375)-Pt(2.375)) < 2.774(1) Å (Pt(2.25)-Pt(2.25)) < 2.824(1) Å (Pt(0)-Pt(II)) < 2.835(1) Å (Pt(2.08)-Pt(2.08)) < 2.839(2) Å (Pt(2.14)-Pt(2.14)) < 3.090(1) Å (Pt(IV)-Pt(IV)) < 3.331(1) Å (Pt(III)-Pt(IV)). Correlations between ligand donor atoms, bond lengths and bond angles are indicated and discussed. © 2013 by Nova Science Publishers, Inc. All rights reserved.