Thermally stable luminescent zinc–Schiff base complexes: A thiocyanato bridged 1D coordination polymer and a supramolecular 1D polymer

A single thiocyanato bridged 1D polymeric zinc complex with dinuclear asymmetric unit [Zn2L1(μ1,3-SCN)(SCN)]n (1) and a dimeric zinc complex [Zn2L2(NCS)(OOCCH3)(CH3OH)2] (2) have been synthesized using two different Schiff bases N,N/-bis(3-methoxysalicylidenimino)-1,3-diaminopropane (L1H2) and N,N/-bis(3-ethoxysalicylidenimino)-1,3-diaminopropane (L2H2), respectively. All the ligands and the complexes have been characterized by microanalytical and spectroscopic techniques. The structures of the complexes have been conclusively determined by single crystal X-ray diffraction studies. Thermo-gravimetric analysis has been performed to investigate their thermal stability. Finally, the photoluminescence properties of the complexes as well as their respective ligands have been investigated with a comparative approach.

Two new ZnII complexes chelated by potentially hexadentate N2O4 donor Schiff bases and thiocyanato ligands have been synthesized and characterized by spectroscopic techniques as well as single crystal X-ray diffraction analysis. In one complex (1) the dinuclear cores are interconnected by SCN− ligands to form 1D polymer but in another (2) SCN− behaves only as terminal ligand. The complexes are thermally stable enough to be used as a luminescent probe.Figure optionsDownload as PowerPoint slide