X-Ray and Synchrotron Diffraction Studies of 2-(Pyridin-2-Yl)-1,10- Phenanthroline in the Role of Ligand for Two Copper Polymorphs or Hydrogen Bonded with 2,2,6,6-Tetramethyl-4-Oxopiperidinium Hexafluorophosphate

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Different extended packing motifs of dichlorido[2-(pyridin-2-yl)-1,10- phenanthroline]copper(II), [CuCl2(C17H11N 3)], are obtained, depending on the crystallization conditions. A triclinic form, (I), is obtained from dimethylformamide-diethyl ether or methanol, whereas crystallization from dimethylformamide-water yields a monoclinic form, (II). In each case, the CuII centre is in a five-coordinate distorted square-pyramidal geometry. The extended packing for both forms can be described as a highly offset Ï€-stacking arrangement, with interlayer distances of 3.674 (3) and 3.679 (3) Ã… for forms (I) and (II), respectively. The reaction of diprotonated Pt(tmpip2NCN)Cl [tmpip2NCN = 2,6-bis(2,2,6,6-tetramethylpiperidylmethyl)benzyl] with AgPF6 under acidic conditions, followed by the addition of 2-(pyridin-2-yl)-1,10-phenanthroline, results in a hydrogen-bonded cocrystal, 2,2,6,6-tetramethyl-4-oxopiperidinium hexafluorophosphate-2-(pyridin-2-yl)-1,10- phenanthroline (1/1), C9H18NO+·PF 6 -·C17H11N3, (III). The extended packing maximizes Ï€-Ï€ interactions in a parallel face-to-face arrangement, with an interlayer stacking distance of 3.4960 (14) Ã…. © 2013 International Union of Crystallography.

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