A series of novel metal-ferrocenedicarboxylate coordination polymers: crystal structures, magnetic and luminescence properties

Novel two-dimensional layered lanthanide(III)-ferrocenedicarboxylate coordination polymers {[M(eta(2)-O(2)CFcCO(2)-eta(2))(mu(2)-eta(2)-O(2)CFcCO(2)-eta(2)-mu(2))(0.5)(H2O)(2)] .mH(2)O}(n) (Fc = (eta(5)-C5H4)Fe(eta(5)-C5H4), M = Tb3+, m = 2, 1; M = Eu3+, m = 2, 2; M = Y3+, m = 1,3) with trapezium-shaped units and one-dimensional wave-shaped Cd(II)-ferrocenedicarboxylate polymer {[Cd(eta(2)-O(2)CFcCO(2)-eta(2))(H2O)(3)].4H(2)O}(n) (4) have been prepared and structurally characterized by single crystal diffraction. In polymers 1-3, each central metal ion (Tb(III), or Eu(III) or Y(III)) is located in a pseudo-capped-tetragonal prism coordination geometry, and ferrocenedicarboxylate anion ligands have two coordination modes (bidentate-chelating mode and tridentate-bridging mode). The magnetic behaviors for 1 and 2 are studied in the temperature range of 5.0-300 K. The results show that the paramagnetic behavior of 2 is mainly due to the effective spin-orbital coupling between the ground and excited states through the Zeeman perturbation, and the weak magnetic interaction between Eu3+ centers can be observed. In addition, compared with sodium ferrocenedicarboxylate, the fluorescent intensities of the polymers 1-4 are enhanced in the solid state. (C) 2003 Elsevier B.V. All rights reserved.