Copper(I) and silver(I) coordination assemblies of imino-pyridyl and azino-pyridyl ligands: Syntheses, crystal structures, spectroscopic and photophysical properties

Six coordination polymers, [Cu(μI)(L1)]n (1), [Cu(μI)(L2)]n (2), [Cu(μI)(L3)]n (3), [Cu(μI)(L4)]n (4), [Ag(L4)(NO3)]n (5) and {[Ag(L5)](ClO4)·4CH3CN)}n (6) based on coinage metals Cu(I)/Ag(I) and a set of five imino-pyridyl ligands (L1–L5) have been synthesized. The self-assembling behaviour of the metals and the ligands and photo-physical properties of these coordination polymers have been described. Cu2I2 secondary building unit (SBU) is a robust feature of the Cu and Iodine self-assembly. This SBU along with the ligands provides 1D coordination polymers in 1, 2 and 4 and 2D coordination polymer in 3. The Ag(I) complex 5 is a helical coordination polymer and 6 is a 2D coordination polymer with (4, 4′) net architecture with rhombic grids.