Crystal structure of Bis(2,2':6',2''-terpyridyl)cobalt(II) perchlorate c. 1.3 hydrate

Abstract

The crystal structure of the title compound, [CO(C₁₅H₁₁N₃)₂](ClO₄)₂.c. 1.3H₂O has been determined by single crystal X-ray diffraction methods at 295 K. The structure is described in terms of atetragonal P4₂/n sub-lattice structure similar to that of [Co(terpy)₂]I₂.2H₂O, with a 8.86(1), c 20.19(2) Å. Perchlorate orientation and disorder, however, demand consideration of superlattice structures in I 4₁/a//F4₁/d with 4 and 8 times the P4₁/n cell volume. The relationship between the general structural features of the [Co(terpy)₂] X₂ salts is described and discussed. The cobalt-nitrogen(central, distal) distances (2.03, 2.14 Å) are the longest observed in the [Co(terpy)₂]²⁺ system, and are consistent with the unusually high magnetic moment of the salt (4.2 BM).