Coordination networks of 2,3-bis(4,5-dimethylthio-1,3-dithiole-2-ylidene)succinonitrile with silver salts: A study of network connectivity and topology as a function of counterion

Complexes of 2,3-bis(4,5-dimethylthio-1,3-dithiole-2-ylidene)succinonitrile (L) with AgX salts (X=NO3-,CF3SO3-) have been prepared and fully characterized by elemental analysis, IR and single-crystal X-ray analysis. The structural topology in the solid state is found to depend on the type of counterions. With AgNO3, a 3D coordination network of composition [Ag2(L)(NO3)2]n (1) forms in which Ag(I) is six-coordinated, bonding to two sulfur atoms of ligand L, a neighboring ligand nitrogen atom and totally three oxygen atoms of bridging nitrate anions. Changing the counterion to triflate produces a 2D coordination network of composition [Ag2(L)(CF3SO3)2]n (2) in which Ag(I) is five-coordinated and bonds to two sulfur atoms of ligand L and totally three oxygen atoms of bridging triflate anions. Obviously, in the latter case, the nitrile groups of L are non-coordinating.

Two new Ag(I) complexes 1 and 2 with a multitopic ligand L have been prepared. Their structures illustrate how the metal coordination assembly in the solid state may be influenced significantly not only by the nature of the counterion, but also by the topicity of the ligand.Figure optionsDownload as PowerPoint slide