Thiocyanate mediated structural diversity in phenol based "end-off" compartmental ligand complexes of group 12 metal ions: Studies on their photophysical properties and phosphatase like activity.
The reaction of a pentadentate compartmental ligand LH, namely 4-tert-Butyl-2,6-bis-[(2-pyridin-2-yl-ethylimino)-methyl]-phenol, with group 12 metal ions (ZnII, CdII, HgII) followed by addition of NaSCN afforded one discrete dinuclear complex [Zn2(L)(SCN)3](1), and two polymeric 1D species [Cd2.5(L)(SCN)3(AcO)]n(2) and [Hg2(L)(SCN)3]n(3). All the complexes have been structurally characterized by single crystal X-ray diffraction. The crystal structure of the complexes reveals different coordination modes of thiocyanate anion that affect the different topology detected in the compounds: the anions are μ1-NCS and μ1,1-NCS connected in complex 1, while μ1,3-NCS bridging mode is observed in 2, and μ1-SCN and μ1,3-NCS in 3. The polymeric Hg complex of the bicompartmental ligand system here reported is unprecedented. Detail study of their photophysical properties including the phosphorescence spectra at 77K has been done. Phosphatase like activity of all the three complexes has been performed in DMSO-H2O medium and their activity follows the order of 1>2>>3.
Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700 009, India; Department of Chemical Sciences, Ariel University, Ariel 40700, Israel.
Jaydeep
J
Adhikary
Department of Chemistry, School of Basic Sciences and Research, Sharda University, Greater Noida, Uttar Pradesh 201306, India.
Prateeti
P
Chakraborty
Department of Chemistry, Presidency University, Kolkata 700073, India.
Sugata
S
Samanta
Department of Chemical and Pharmaceutical Sciences, University of Trieste, Via L. Giorgieri 1, 34127 Trieste, Italy.
Ennio
E
Zangrando
The School of Science, Adamas University, Barasat, West Bengal, India. Electronic address: pchemsg@gmail.com.
Sanjib
S
Ghosh
Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700 009, India. Electronic address: dasdebasis2001@yahoo.com.
Debasis
D
Das
Coordination chemistry; Group 12 metals; Phosphatase like activity; Photophysical property; Structural diversity