Crystal structure of Bis(tri-2-pyridylamine)cobalt(II) diperchlorate

Abstract

The crystal structure of the title compound, [Co((C₅H₄N)₃N)₂] (ClO₄)₂, has been determined by single-crystal X-ray diffraction at 295(1) K, i.e. in its pseudo-'high-spin' form, and refined by least squares to a residual of 0.061 for 4639 'observed' reflections. Crystals are monoclinic, P2₁/a, a 12.811(7), b 17.644(7), c 8.375(4) Ǻ, β 120.15(3)°, Z 2. Whereas in the iron(II) ('low-spin') analogue, the metal atom coordination geometry deviates only trivially from octahedral (<Fe-N> 1.98₂ Ǻ, <N-Fe-N> within the one ligand 88.1°), in the present compound Co-N ranges from 2.100(2) to 2.152(2) Ǻ and the intraligand N-Co-N angles range from 84.86(7) to 86.09(8)°.