Emission Enhancement Through Dual Donor Sensitization And Photo-Luminescine Properties Of Europium(Iii)And Terbium(Iii) -Terpyridine -Tetracyanoplatinate Complexes

Luminescence studies were conducted on tetracyanoplatinate complexes that contain up to four different ligands simultaneously, resulting in very complex structural features. Most of the complexes of (terpy)-Eu-platinum tetra cyanide complexes (terpy = terpyridine) crystallize with low one-, and two-dimensional structural types. The effects of anion variation on the intermolecular energy transfer (IET) mechanism are discussed in detail. Temperature dependent luminescence studies were also conducted on terbium based compounds that contain different ligands resulting in complex structural features. The system also displays dual donor feature where both the organic ligand (terpyridine) and the platinum tetracyanide (TCP) metal complex act as donors. When the counter anion is changed to the acetate ion, the bonding interaction between the donor (TCP complex) and acceptor (Eu3+ and Tb3+) is removed, and the energy transfer pathway is blocked. As a result, the donor emits strongly, albeit totally quenched in the complexes with direct bonding interaction. Moreover, all of these complexes show interesting structural features that consist of channels capable of accommodating volatile organic compounds (VOC). Studies on VOC sensing by these compounds is currently in progress in our laboratory. Details of the photoluminescence studies are presented in this thesis