Catena-Poly[[[2,4-dichloro-6-{[(2-hydroxyethyl)imino]methyl}phenolato-κ³N,O,O']-copper(II)]-μ-chlorido]monohydrate]: Synthesis, structural, spectroscopic and luminescent properties

ABSTRACT

A new chloride bridged polymeric Cu(II) complex, [Cu(HL)(μ-Cl).H₂O]_n, 1, (H₂L = 2,4-dichloro-6-{[(2-hydroxyethyl)imino]methyl}phenol) has been synthesized and characterized by elemental-spectral analysis, crystal structure analysis and photoluminescence measurements. The Copper(II) atom is five-coordinate in a slightly distorted square-pyramidal geometry (τ = 0.085), with one N and two O atoms of the Schiff base ligand and one Cl atom defining the basal plane and a symmetry-related Cl atom occupying the apical position. The bridging Cl atom lies in apical position for one Cu(II) ion and basal for the other, and it makes this structural arrangement unusual. The linked moieties form polymeric zigzag chains running along the c axis. This zigzag chains connect each other with intramolecular and intermolecular O–H···O hydrogen bonds, which form 3D structure through π−π interactions. Furthermore, the photoluminescence properties of H₂L and 1 were investigated, they exhibit unique bright green visible emissions in the solid state, under the excitation of 349 nm UV light. The strong luminescence emission of them makes 1 a potentially useful photoactive material in photo-physical chemistry.

KEYWORDS:

• Crystal structure analysis
• polymeric Cu(II) complex
• photoluminescence

Acknowledgements

The authors are grateful to the Research Funds of Balikesir University (BAP-2017 / 161) for the financial support and to Balikesir University, Science and Technology Application and Research Center (BUBTAM) for the use of the Photoluminescence Spectrometer. In addition, Dr. Acar is also grateful to Prof. Andrea Caneschi and Laboratory of Molecular Magnetism (Department of Chemistry, University of Florence) for the use of Xcalibur-3 diffractometer.