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Z. Naturforsch. 2013,
68b, 546 – 550
doi:10.5560/ZNB.2013-3077
Coordination Chemistry of Polynitriles, I. Syntheses and Crystal Structures of [Ag(PCC)(DMF)], [Ni(DMF)6](PCC)2 and [Co(DMF)6](PCC)2 (PCC = [C5(CN)5]−, DMF = N,N-Dimethylformamide)
Ludwig-Maximilians-University Munich, Department of Chemistry, Butenandtstr. 9, 81377 München, Germany
Reprint requests to Prof. Dr. Karlheinz Sünkel. Fax: ++49 89 2180 77774. E-mail:
suenk@cup.uni-muenchen.de
Received March 1, 2013 / published online Juli 2, 2013
Dedicated to Professor Heinrich Nöth on the occasion of his 85th birthday
Recrystallization of silver pentacyanocyclopentadienide Ag[C5(CN)5] from N,N-dimethylformamide (DMF) gives the polymeric 1:1 complex [Ag{C5(CN)5}(DMF)] (1). The Ag+ cation is coordinated by three N atoms of three different [C5(CN)5]− anions and two O atoms of two DMF molecules. Each [C5(CN)5]− is coordinated via three neighboring CN groups to three different Ag+ ions, while each DMF molecule bridges two Ag+ ions via its O atom. Treatment of NiCl2 ·6H2O, CoCl2 ·6H2O or ZnCl2
with Ag[C5(CN)5] in DMF gives the DMF complexes [M(DMF)6][C5(CN)5]2 (M = Ni, 2; Co, 3; Zn, 4). The complexes 2 and 3 were characterized by X-ray diffraction and show octahedral [M(DMF)6]2+ cations with O-coordinated DMF molecules. The [C5(CN)5]− anions show ideal pentagonal symmetry.
Key words: Silver, Cobalt, Nickel, Zinc, Pentacyanocyclopentadienide, Dimethylformamide Complexes