Silver® pyrazolates crystal structure

The crystal structure of tris(l-phenyl-3,5-dimethylpyrazole)silver(I) nitrate (3) has been determined.63 The Ag+ ion sat at the centre of a triangle of 3 Ns from the pyrazole rings and the Ag—N bond lengths were about 224 pm. The nitrate groups were situated between the silver ions in the crystal lattice but the separations were of the order of 550-700 pm—too far... 

Dinuclear complexes were obtained by reacting some binary copper(I) and silver(I) homoleptic pyrazolate complexes with neutral ligands. The trimeric [Cu(dmpz)]3 (23) readily reacted with phen or RNC (R = cyclohexyl) to give the doubly bridged species [(phen)Cu(/i-dmpz)2Cu(phen)], 32, (49) or [(RNC)Cu(/t-dmpz)2Cu(RNC)], 33 (50). The dimeric nature of 32 was argued from its spectroscopic and chemical properties, while 33 was characterized by an X-ray crystal structure analysis (50). 

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