摘要:
The interplay of argentophilic and dipolar (pi-acid center dot center dot center dot base) interactions, on one hand, and the presence or absence of interstitial solvent molecules, on the other, determines the supramolecular organization of trinuclear silver-pyrazolato complexes in the solid state. The crystal structures of one gold and six silver metallacyclic complexes of the type [M-I(mu-pz*)](3), where pz* are the substituted pyrazolato anions 3,5-Ph-2-pz, 3-Me-5-Ph-pz, 4-Br-3,5-Ph-2-pz, 4-Br-3-Bu-t-pz and 3-(o-Cl-C6H4)-pz and M = Ag and Au, are discussed in the context of their supramolecular organization. Two silver complexes, for which the pi-acid character of their Ag-3-faces is maximized by their peripheral electron-withdrawing substituents, show crystal packing dominated by short Ag-3 center dot center dot center dot Br contacts, the first structural manifestation of supramolecular structure via dipolar interactions involving the tunable it-acidity of the Ag-3-face.