664310-83-2Relevant academic research and scientific papers
Influence of the crystallization solvent on molecular and supramolecular structures of silver(I) tris(3-phenylpyrazolyl)methane complexes
Reger, Daniel L.,Semeniuc, Radu F.,Smith, Mark D.
, p. 3480 - 3494 (2007/10/03)
The compound [{HC(3-Phpz)3}Ag](BF4) (pz = pyrazolyl ring) has been prepared and shown to crystallize in four different forms depending on the solvent. Vapor-phase diffusion of diethyl ether into nitromethane solutions of the complex produces two polymorphs, an orthorhombic form (1) and triclinic form (2). Both polymorphs are coordination polymers constructed by a κ2-κ1 coordination of the tris(3-Phpz)methane units and have similar, but different, supramolecular structures. In 1 there are two independent chains linked by C-H...π interactions. In 2 only one type of chain is present, with a different internal structure than in 1. Non-covalent forces, mainly C-H...π interactions, organize the chains into sheets and the sheets into a final 3-D supramolecular structure in the case of 1, while in the case of 2 only a 2-D supramolecular structure forms. In contrast, vapor-phase diffusion of diethyl ether into acetonitrile or acetone solutions produces [{HC(3-Ph-pz)3}Ag{(CH 3)2CO}](BF4) (3) and [{HC(3-Phpz) 3}Ag{CH3CN}](BF4) (4). In these compounds, the ligand shows tripodal coordination to a single silver center and coordination of one solvent molecule to the metallic center. Both compounds form 3-D supramolecular structures organized by both C-H...π interactions and weak C-H...F hydrogen bonds and in the case of 4 π-π stacking. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.
