Acta Crystallographica Section C

Volume 65, Part 10 (October 2009)

metal-organic compounds

 

Two novel silver(I) coordination polymers: poly[(₂-2-aminopyrimidine-²N¹:N³)bis(₃-thiocyanato-³S:S:S)disilver(I)] and poly[(2-amino-4,6-dimethylpyrimidine-N)(₃-thiocyanato-³N:S:S)silver(I)]

G.-G. Luo, D. Sun, N. Zhang, R.-B. Huang and L.-S. Zheng

Abstract: 2-Aminopyrimidine (L1) and 2-amino-4,6-dimethylpyrimidine (L2) have been used to create the two novel title complexes, [Ag₂(NCS)₂(C₄H₅N₃)]_n, (I), and [Ag(NCS)(C₆H₉N₃)]_n, (II). The structures of complexes (I) and (II) are mainly directed by the steric properties of the ligands. In (I), the L1 ligand is bisected by a twofold rotation axis running through the amine N atom and opposite C atoms of the pyrimidine ring. The thiocyanate anion adopts the rare ₃-³S coordination mode to link three tetrahedrally coordinated Ag^I ions into a two-dimensional honeycomb-like 6³ net. The L1 ligands further extend the two-dimensional sheet to form a three-dimensional framework by bridging Ag^I ions in adjacent layers. In (II), with three formula units in the asymmetric unit, the L2 ligand bonds to a single Ag^I ion in a monodentate fashion, while the thiocyanate anions adopt a ₃-¹N,²S coordination mode to link the AgL2 subunits to form two-dimensional sheets. These layers are linked by N-HN hydrogen bonds between the noncoordinated amino H atoms and both thiocyanate and pyrimidine N atoms.

Formula: [Ag₂(NCS)₂(C₄H₅N₃)] and [Ag(NCS)(C₆H₉N₃)]

	Structure factor file (CIF format) (51.3 kbytes) [ doi:10.1107/S0108270109032934/sq3210Isup2.hkl ] Contains datablock I
	Structure factor file (CIF format) (274.4 kbytes) [ doi:10.1107/S0108270109032934/sq3210IIsup3.hkl ] Contains datablock II

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