José Campo - Academia.edu (original) (raw)
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Three new ionic silver complexes based on the 3,5-dimethyl-4-nitropyrazole ligand ðHpz NO 2 Þ and... more Three new ionic silver complexes based on the 3,5-dimethyl-4-nitropyrazole ligand ðHpz NO 2 Þ and 1:2 or 1:3 ðAg : Hpz NO 2 Þ stoichiometries, ½AgðHpz NO 2 Þ 2 ½BF 4 , ½AgðHpz NO 2 Þ 3 ½SbF 6 and ½AgðHpz NO 2 Þ 3 ½PO 2 F 2 Á Hpz NO 2 have been prepared and structurally characterised. The linear or trigonal metallic coordination environment, the NO 2 groups on the pyrazole ligand as well as the presence of counteranions of the type AX n À as BF 4 À , SbF 6 À or PF 6 À (the latter one evolving to PO 2 F 2 À) were strategically selected to produce molecular assemblies established on the basis of hydrogen-bonds (N-HÁ Á ÁX) and pÁ Á Áp or coordinative interactions involving the NO 2 group. The complex ½AgðHpz NO 2 Þ 2 ½BF 4 exhibited polymeric N-HÁ Á ÁF hydrogen-bonded chains which were assembled in a 3D network by weaker coordinative AgÁ Á ÁO(NO 2) and p(NO 2)Á Á Áp(NO 2) interactions. In the complex ½AgðHpz NO 2 Þ 3 ½SbF 6 , consistent with the three-coordinated molecular environment, the interactions were extended to give rise an open 3D cationic sub-network in which the counteranions SbF 6 À were encapsulated. By contrast, in the related complex ½AgðHpz NO 2 Þ 3 ½PO 2 F 2 Á Hpz NO 2 the presence of a fourth non-coordinated pyrazole Hpz NO 2 avoided the formation of a 3D network giving rise to a double-chained 1D structure.
Three new ionic silver complexes based on the 3,5-dimethyl-4-nitropyrazole ligand ðHpz NO 2 Þ and... more Three new ionic silver complexes based on the 3,5-dimethyl-4-nitropyrazole ligand ðHpz NO 2 Þ and 1:2 or 1:3 ðAg : Hpz NO 2 Þ stoichiometries, ½AgðHpz NO 2 Þ 2 ½BF 4 , ½AgðHpz NO 2 Þ 3 ½SbF 6 and ½AgðHpz NO 2 Þ 3 ½PO 2 F 2 Á Hpz NO 2 have been prepared and structurally characterised. The linear or trigonal metallic coordination environment, the NO 2 groups on the pyrazole ligand as well as the presence of counteranions of the type AX n À as BF 4 À , SbF 6 À or PF 6 À (the latter one evolving to PO 2 F 2 À) were strategically selected to produce molecular assemblies established on the basis of hydrogen-bonds (N-HÁ Á ÁX) and pÁ Á Áp or coordinative interactions involving the NO 2 group. The complex ½AgðHpz NO 2 Þ 2 ½BF 4 exhibited polymeric N-HÁ Á ÁF hydrogen-bonded chains which were assembled in a 3D network by weaker coordinative AgÁ Á ÁO(NO 2) and p(NO 2)Á Á Áp(NO 2) interactions. In the complex ½AgðHpz NO 2 Þ 3 ½SbF 6 , consistent with the three-coordinated molecular environment, the interactions were extended to give rise an open 3D cationic sub-network in which the counteranions SbF 6 À were encapsulated. By contrast, in the related complex ½AgðHpz NO 2 Þ 3 ½PO 2 F 2 Á Hpz NO 2 the presence of a fourth non-coordinated pyrazole Hpz NO 2 avoided the formation of a 3D network giving rise to a double-chained 1D structure.