abstract
The reactions of 1H-1,2,4-triazole (Htr) with MX2 (ZnCl2 for 1; CdBr2 for 2) resulted in two coordination polymers, [Zn(tr)Cl](n) (1) and [Cd(Htr)(2)Br-2](n) (2). The structural analyses indicate that 1 and 2 feature a 2D layer and 1D triple chain, respectively. In 1, neighouring Zn atoms are connected by mu(3)-1 kappa N: 2 kappa N: 4 kappa N-tr(-) anionic ligand into 6- and 16-membered rings, further grow into a 2D sheet. Cd atoms in 2 are bonded by two mu(2)-Br- bridges and neutral mu(2)-1 kappa N: 2 kappa N-Htr to form a 1D triple chain. The fluorescent characterizations of 1,2 and the free Htr ligand feature simlilar emission peakes at 444, 446 and 423 nm respectively, which can be assigned to intra-ligand pi-pi* transition of (H)tr. The energy gaps of 5.90 eV for 1, 5.16 eV for 2, and 5.93 eV for Htr suggest that the compounds behave as insulators.
keywords
CRYSTAL-STRUCTURE; SPIN-TRANSITION; HYDROTHERMAL SYNTHESIS; MAGNETIC-PROPERTIES; LINEAR TRINUCLEAR; MOSSBAUER-SPECTROSCOPY; LUMINESCENT PROPERTIES; ORGANIC FRAMEWORKS; TRIAZOLE LIGANDS; MONOMERIC ZN(II)
subject category
Chemistry
authors
Zhang, XC; Xu, L; Liu, WG; Liu, B
Groups
acknowledgements
The authors gratefully acknowledge the financial support of post-doc grants (SFRH/BPD/47566/2008 and SFRH/BPD/73415/2010) from Fundacao para a Ciencia e a Tecnologia and the NSF of Heilongjiang Province (B2000714).