Coordination chemistry of bis(2-pyridylimine) ligands with Ag(I): formation of two structurally different coordination polymers and one metallocycle controlled by linker and the solvent system |
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| Authors: | Harold B Tanh Jeazet Jens Mizera Thomas Doert Kerstin Gloe Axel Heine Gert Bernhard Karsten Gloe |
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| Institution: | 1. Department of Chemistry and Food Chemistry, TU Dresden, 01062, Dresden, Germany
2. Institute of Radiochemistry, Helmholtz Centre Dresden-Rossendorf, 01314, Dresden, Germany
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| Abstract: | Reaction of equimolar amounts of AgClO4 and bis4-(2-pyridylmethyleneamino)phenyl] methane (L1) or bis4-(2-pyridylmethyleneamino)phenyl] ether (L2) in a 1:1 solvent mixture of CH3CN and CH2Cl2 leads to the formation of two infinite coordination polymers of the composition {Ag(L1)]ClO4·CH3CN}n (1) and {Ag(L2)]ClO4·CH2Cl2}n (2). Whereas 1 represents a homochiral single-stranded helicate the related complex 2 shows a typical zigzag chain arrangement. Both structures are characterized by a distorted tetrahedral coordination environment of the Ag(I) centres each based on a N4 coordination pattern of two ligand molecules. The resulting strands are connected by a hydrogen bonding network including ClO4 ? anions and solvent molecules forming 2-D layers. Additional ?ШC?? and CH?C?? interactions between the aromatic parts of the ligand molecules give a 3-D arrangement of the packing. In contrast, a discrete dinuclear metallocycle, Ag2(L2)2](ClO4)2·CH3OH (3), has been formed by reaction of AgClO4 with L2 when CH2Cl2 in the solvent mixture was replaced by CH3OH. Again each Ag(I) has a distorted tetrahedral geometry and is coordinated to two pyridylimine units of two ligand molecules. Additional weak hydrogen bonds involving perchlorate and solvent molecules as well as edge-to-face and face-to-face ?ШC?? interactions allow a 3-D packing arrangement. |
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