Abstract

Mono and hetero binuclear cryptates, [GdML(DMF)] [M = VO(IV), Co(II), Cu(II)], were synthesized. The ligand L represents the deprotonated anionic cryptate obtained by the 2+3 condensation of tris-(2-aminoethyl)amine with 2,6-diformyl-4-methylphenol. The crystal structure of [GdL(NO3)](NO3)(2)center dot H2O was determined by single-crystal X-ray diffraction method. The magnetic susceptibility of the complexes was measured by SQUID. The Gd(III)Cu(II) cryptate has ferromagnetic interaction and [Gd(III)VO(IV)] cryptate has weaker intramolecular antiferromagnetic interaction. Fluorescence intensity and excited state lifetime of the cryptates increase in the following order: [GdCoL] [GdVOL] [GdL] [GdCuL]. The efficiency (eta) of cryptate based dye-sensitized solar cell increases in the following order: [GdL] [GdVOL] [GdCoL] [GdCuL]. The reduction potential values of [Gd(M) L] M = VO(IV), Co(II), Cu(II) complexes are in the following order: Cu(II)[Co(II)[VO(IV). The catecholase activity of binuclear [GdML] complexes are relatively high compared with the mononuclear [Gd(III) L] complex in the following order: [GdL] [GdVOL] [GdCoL] [GdCuL]. The antimicrobial activity of the binuclear complex Gd(III)Cu(II) is relatively higher than the mononuclear and other binuclear complexes.