Synthesis, Structure and Properties of a New Terbium(III) Complex Tb 2 (C 15 H 11 O 3 ) 6 (phen) 2

A new terbium(III) complex Tb-2(C15H1O3)(6)(phen)(2) has been synthesized with 2-(4-methylbenzoyl)benzoic acid and 1,10-phenanthroline as ligands. Crystal data for the complex are as follows: monoclinic, space group P2(1)/n, a = 15.0786(6), b = 13.5762(5), c = 22.9683(9) angstrom, beta = 104.130(4)degrees, V = 4559.6(3) angstrom(3), D-c = 1.540 g/cm(3), Z = 2, mu(MoK alpha) = 1.615 mm(-1), F(000) = 2136, the final R = 0.0528 and wR = 0.0740. The Tb(III) ion is coordinated by eight atoms to give a distorted square antiprism coordination geometry. The complex shows four fluorescence emission bands arising from the transitions of Tb3+ :D- 5(4) -> F-7(6) (490 nm), D-5(4) -> F-7(5) (546 nm), D-5(4) -> F-7(4) (588 nm) and D-5(4) -> F-7(3) (622 nm). The complex is an antiferromagnet in the range of 300 similar to 2 K. Also reported in the paper is the thermal stability property of the title complex.