Mononuclear copper(II) complexes containing chelating ligand of 2-methyl-N-(pyridine-2-yl-methyl)propane-2-amine as chromotropic probes
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The synthesis of two mononuclear copper(II) complexes of formula [L2CuX]X where L is a bidentate ligand of N-(pyridin-2-yl-methyl)propane-2-amine and X = Cl, 1 and Br, 2, is reported. Both complexes are fully characterized by elemental analysis, spectroscopic techniques (IR, UV–Vis, and EPR), thermal analysis, conductance measurements, and single-crystal X-ray structure determination. The structures of both complexes are similar and display a distorted square–pyramidal arrangement around copper(II) ion. The chromotropism behavior of the complexes, including thermo- and halochromism, was investigated. The complexes demonstrated strongly pronounced reversible thermochromism in solution due to dissociation and re-coordination of halide and bidentate ligands. Their halochromism was investigated in pH range of 3.0–11.0 by visible absorption spectroscopy. Their reversible color variations from blue to colorless attributed to the deprotonation and protonation of the bidentate ligands.
KeywordsCopper(II) complex Chromotropism Halochromism Mononuclear complex
We are grateful for the financial support of the University of Mazandaran of the Islamic Republic of Iran.
- 7.L. Stryer, Biochemistry, 3rd Ed. New York: Freeman; 1988Google Scholar
- 9.P. Bamfield, Chromic phenomena: technological applications of color chemistry Springer, Berlin, 2002, p. 8Google Scholar
- 13.SAINT, Software for the CCD Detector System, (version 7.06A), Bruker AXS (Inc, Madison, Wisconsin, 2005)Google Scholar
- 15.G.M. Sheldrick, SHELXL-2014/7: program for the solution of crystal structures (University of Göttingen, Göttingen, 2014)Google Scholar
- 16.G.M. Sheldrick, Acta Cryst. C71, 3–8 (2015)Google Scholar
- 17.A.W. Addison, T.N. Rao, J. Reedijk, J. van Rijn, G.C. Verschoor, J. Chem. Soc. Dalton Trans. 1349–1356 (1984)Google Scholar
- 20.Cambridge Structural Database System, Cambridge Crystallographic Data Centre, University Chemical Laboratory, Cambridge, UKGoogle Scholar
- 24.V. Sakaguchi, A.W. Addison, J. Chem. Soc. Dalton Trans. 600–608 (1979)Google Scholar