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NMR study of thermodynamic and structural properties of molecular complexes formed by metalloporphyrins and aromatic substrates

✍ Scribed by Alexander N. Kitaigorodski; Ulf Edlund

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
500 KB
Volume
29
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

^1^H NMR shifts and ^13^C spin–lattice relaxation rates were measured for various aromatic π‐acceptors (S) in solutions containing paramagnetic cobalt(II) and iron(III) porphyrins (P). The stability constants of P Β· S molecular complexes and limiting values of substrate chemical shifts in the complexes were determined from the concentration dependence of chemical shifts. The abilities of different substituents to promote complexation of aromatics with metalloporphyrins are discussed. The preferred substrate orientation in molecular complexes were derived using relative values of chemical shifts and relaxation rates induced by metalloporphyrins. Both monocyclic (benzene and pyridine derivatives) and bicyclic (naphthalene derivative) substrates tend to form β€˜axially symmetric’ adducts with parallel π‐planes and the centre of the aromatic system situated in the vicinity of the porphyrin z‐axis.

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