CRYSTAL STRUCTURE OF A SILVER(I) COMPLEX {[Ag(N-METHYLTHIOUREA)2]NO3}n EXHIBITING INFINITE CHAINS OF AgS4 TETRAHEDRA
Habib-ur-rehman1, S. Ahmad2, H. Ajaz3, M. Hanif4, M. Altaf5, H. Stoeckli-evans6
1 Exxelis Limited ETTC/Biospace
2 Department of Chemistry University of Engineering and Technology, saeed_a786@hotmail.com
3 Department of Chemistry University of Engineering and Technology
4 Department of Chemistry University of Engineering and Technology
5 Institute of Physics University of NeuchГўtel
6 Institute of Physics University of NeuchГўtel
Keywords: Silver(I) complexes, N-methylthiourea, crystal structure
Pages: 164-169
Abstract
A polymeric silver(I) complex, bis(N-methylthiourea)silver(I) nitrate, {[Ag(Metu)2]NO3}n is prepared and its crystal structure is determined by X-ray crystallography. The compound crystallizes in the monoclinic C2/c space group. In the structure, distorted AgS4 tetrahedra are linked through the sulfur atoms of the Metu ligand to form isolated infinite chains of the type [Ag(SR)2]. The cationic chains are separated from each other by nitrate ions that do not coordinate to the metal ion. The chains are bridged via N-H…O hydrogen bonds involving the nitrate ions. The complex exhibits an Ag---Ag separation of ~3.21 Å indicating the existence of significant argentophilic interactions. An upfield shift in the >C=S resonance of Metu in 13C NMR and downfield shift in the N-H resonance in 1H NMR are consistent with sulfur coordination to silver(I).
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