Crystal structure of salicylato-(1,10-phenanthroline)thallium(I)

Abstract

A three-dimensional X-ray crystal structure analysis has shown that the title compound exists as a dimeric entity, the two halves related by a two-fold axis. The five atoms of the thallium co-ordination sphere form the base of a shallow, irregular pentagonal pyramid which has the thallium ion at its apex. The phenanthroline ligand co-ordinates to the TI⁺ ion through both nitrogen atoms, with TI ⋯ N 2·65 and 2·71 Å;. The salicylate ion forms an asymmetrical bidentate co-ordination with one TI⁺ through the two oxygen atoms of the carboxylate group, TI ⋯ O 2·65 and 2·98 Å; the first oxygen also has a weak ‘bridging’ interaction with the other thallium of the dimer, TI ⋯ O 3·00 Å;. The second oxygen atom of the carboxylate group is hydrogen-bonded to the phenolic group, O ⋯ O 2·52 Å;.

Crystals are colourless needles, orthorhombic, space group Pbcn, with a= 22·769, b= 10·273, c= 14·204 Å;. The structure was determined from diffractometer observations, by the heavy-atom method, and refined (the thallium ion anisotropically) by least-squares methods to R 0·101 for 1599 reflections.