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- Title
Supramolecular Arrays of Cationic Complexes Containing Pyrazole Ligands and Tetrafluoroborate, Trifluoromethanesulfonate, or Nitrate as Counterions. Crystal Structure of Bis(3,5-dimethyl-4-nitro-1H-pyrazole-κN2)silver(1+) Nitrate ([Ag(HpzNO2)2](NO3))
- Authors
M. 4;Luz Gallego; Mercedes Cano; José 4;A. Campo; José 4;V. Heras; Elena Pinilla; M. 4;Rosario Torres
- Abstract
The structures of [Pd(η3-C3H5)(HpzR2)2](BF4) (HpzR2=Hpzbp2=3,5-bis(4-butoxyphenyl)-1H-pyrazole, 1; HpzR2=HpzNO2=3,5-dimethyl-4-nitro-1H-pyrazole=Hdmnpz, 2) and [Ag(HpzR2)2](A) (HpzR2=Hpzbp2, A=$\rm{ BF_4^ -}$, 3; HpzR2=HpzNO2, A=$\rm{ CF_3 SO_3^ -}$, 4) were comparatively analyzed to determine the factors responsible for polymeric assemblies. In all cases, the H-bonding interactions between the pyrazole moieties and the appropriate counterion and, in particular, the orientation of the NH groups of the pyrazole ligands are determinant of one-dimensional polymeric arrays. In this context, the new compound [Ag(HpzNO2)2](NO3) (5) was synthesized and its structure analyzed by X-ray diffraction (Fig. 4;4). The HpzNO2 serves as N-monodentate ligand, which coordinates to the AgI center through its pyrazole N-atom giving rise to an almost linear N—Ag—N geometry. The planar NO$\rm{_{3}^{-}}$ counterion bridges two adjacent AgI centers to form a one-dimensional zigzag-shaped chain which is also supported by the presence of N—H⋅⋅⋅O bonds between the pyrazole NH group of adjacent cationic entities and the remaining O-atom of the bridging NO$\rm{_{3}^{-}}$ (Fig. 4;5). The chains are further extended to a two-dimensional layer-like structure through additional Ag⋅⋅⋅O interactions involving the NO2 substituents at the pyrazole ligands (Fig. 4;6).
- Publication
Helvetica Chimica Acta, 2005, Vol 88, Issue 9, p2433
- ISSN
0018-019X
- Publication type
Article