Article,

A Novel 1:1 Co-Crystal of Bis(1,10-Phenanthroline)(1,10-Phenanthroline-5,6-Dione)Nickel(II) Hexafluorophosphate and Tris(1,10-Phenanthroline)Nickel(II) Hexafluorophosphate Complexes, Ni(phen)(2)(phen-dione) Ni(phen)(3) (PF6)(4)

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JOURNAL OF CHEMICAL CRYSTALLOGRAPHY, 42 (5): 486-493 (May 2012)
DOI: {10.1007/s10870-011-9992-y}

Abstract

The purpose of this study was to investigate whether co-crystals form by simply mixing pure solutions of Ni(phen)(3)(PF6)(2) and Ni(phen)(2)(phen-dione)(PF6)(2) where phen is 1,10-phenanthroline and phen-dione is 1,10-phenanthroline-5,6-dione. The 1:1 cocrystal, Ni(phen)(2)(phen-dione)Ni(phen)(3)(PF6)(4)center dot CH3CN has been characterized by elemental analysis, IR, paramagnetic NMR, and UV-vis spectroscopies, cyclic voltammetry, and single crystal X-ray structure analysis. The title complex crystallized in triclinic crystal system (z = 2) with space group of PA <<, a = 13.201(2) , b = 14.782(3) , c = 22.294(4) , alpha = 81.575(15)(o), beta = 88.756(15)(o), gamma = 88.032(15)(o) and V = 4300.1(14) (3). A careful inspection of the packing pattern in the lattice reveals that non-covalent interactions of three different types, viz. C-H center dot center dot center dot F, C=O center dot center dot center dot H-C and C-H center dot center dot center dot pi interactions, are active in the lattice. The coordination around the Ni(II) centers is a distorted octahedral, with bite angles of 78.3-79.8(o) for the chelating phen and phen-dione ligands. Cyclic voltammetry of this co-crystal shows that the Ni(III/II) couple is quasi-reversible. The effective magnetic moment (mu(eff)) of the co-crystal was measured to be 2.87 BM per Ni(II) ion by Evans method. The magnitude of mu(eff) is consistent with magnetic moment for octahedral Ni(II) complexes.

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