Diversity of coordination architecture of silver(Ι) complexes with different 2-aminopyrimidyl derivatives: Effect of counter anions and ligands

Abstract

Five new silver(Ι) complexes of the formula [Ag(L 1)(CF 3SO 3)(H 2O)] n ( 1), [Ag 4(L 1) 4(CF 3CO 2) 4] n ( 2), [Ag 2(L 1) 4(ClO 4) 2] ( 3), [Ag(L 2)(ClO 4)] n ( 4), and [Ag(L 3)(ClO 4)] n ( 5) have been synthesized by reactions of varied silver(Ι) salts with the corresponding 2-aminopyrimidyl ligands (namely, 2-amino-4,6-dimethylpyrimidine (L 1), 2-amino-4-methoxy-6-methylprimidine (L 2), and 2-amino-4,6-dimethoxyprimidine (L 3)). The influences of counter anions and ligands on the structure of the complexes are discussed. Two complexes, 1 with one-dimensional (1D) zigzag chain and 2 with 1D ladder network are obtained by using the same ligand L 1 but different silver(Ι) salts. On the other hand, using the same silver(Ι) perchlorate but different ligands under the same synthetic conditions, complexes 3– 5 are isolated, respectively. In the case of 3, two metal atoms and four L 1 ligands form dimeric [Ag 2(L 1) 4] unit further connected by intermolecular hydrogen bonds and π–π interactions to form an infinite 2D layer structure. Complex 4 displays a two-dimensional (2D) grid network. Complex 5 has a 1D zigzag chain but different from that of 1. An extended 3D framework arises from N–H···O intermolecular hydrogen bonds and Ag···O weak interaction. The results reveal that the nature of the counter anions and organic ligands all has great impact on the structure of the complexes. In addition, the hydrogen-bonding interactions and π–π stacking also play important roles in the formation of supramolecular architectures, for instance, to link low-dimensional entities to high-dimensional frameworks. The luminescence properties of the synthesized silver complexes were investigated in the solid state at room temperature.