Two Cd(II) complexes derived from mercapto-triazole ligands: syntheses, crystal structures, and luminescent properties

Abstract

Two cadmium complexes, {[Cd(a-ptt)(ptt)]·H₂O}_n (1) and [Cd(a-Hmtt)₂(SO₄)H₂O]·CH₃OH (2), have been prepared based on 4-amino-3-(4-pyridine)-5-mercapto-1,2,4-triazole (a-Hptt) and 4-amino-3-methyl-5-mercapto-1,2,4-triazole (a-Hmtt), respectively. In 1, amino-triazole ligand a-Hptt can partly be deaminated and transformed into 3-(4-pyridine)-5-mercapto-triazole (Hptt) under hydrothermal conditions. X-ray diffraction analysis reveals that 1 exhibits an unusual 2-D lampshade-type layer structure in which the amino ligand a-ptt and the deamination ligand ptt display exo-tridentate bridging and bidentate bridging, respectively. Complex 2 is mononuclear and further assembled into a 3-D supramolecular architecture via non-covalent interactions. Complexes 1 and 2 were characterized by elemental analyses, IR, and thermogravimetric analyses. Furthermore, solid-state luminescent properties of 1 and 2 have also been investigated.

Keywords:

• Mercapto-triazole ligands
• Deamination
• Cd(II) complexes
• Crystal structures
• Luminescent properties

Supplementary material

Crystallographic data for the structural analysis has been deposited with the Cambridge Crystallographic Data Center. CCDC 881607 and 914510 contain supplementary crystallographic data for 1 and 2. The data can be obtained free of charge via www.ccdc.cam.ac.uk/conts/retrieving.htm (or from the Cambridge Crystallographic Data Center, 12 Union Road, Cambridge CB2 1EZ, UK; Fax: [phone]).

Acknowledgments

The authors thank the National Natural Science Foundation of China (Nos. 20801048, 20971110 and J1210060), Program for New Century Excellent Talents of Ministry of Education of China (NCET-07-0765), the Outstanding Talented Persons Foundation of Henan Province.