Novel silver(I) pyrazole-based coordination polymers: Synthetic and structural studies

The reaction of 1,1,3,3-tetrakis(3,5-dimethyl-1-pyrazole)propane (tdmpp) with silver(I) salts (AgSCN or AgI) leads to the formation of [Ag-2(mu(2)-SCN)(2)(mu(2)-tdmpp)](n) (1) and [{Ag-2(mu(2)-I)(2)(mu(2)-tdmpp)}center dot DMF](n) (2) complexes. These compounds have been characterized using single crystal X-ray diffraction, elemental analysis and infrared spectroscopy. In both complexes, the Ag(I) centers are in distorted tetrahedral environments with Ag centers bridged alternately by tdmpp bridges and pairs of anions. The crystals of polymorphs [Ag(dmpzH)(2)](2)Cr2O7 (3) and (4), were generated by the reaction of silver(I) chromate with dmpzH (3,5-dimethylpyrazole) in acetone. Recrystallization from acetone/water yielded (3) and recrystallization from thf gave (4). In each structure, two monodentate pyrazole ligands bind to the Ag(I) centers in a linear arrangement. Longer, weak interactions, with the dichromate anions, lead to the formation of 1D polymers in each case. (C) 2012 Elsevier Ltd. All rights reserved.