Syntheses and characterizations of tetracyanoplatinate(II) complexes with 2-pyridineethanol

Abstract

The cyanide-bridged heteronuclear polymeric complexes, [M(hepH)₂Pt(μ-CN)₂(CN)₂]_n (M = Cu(II) (1), Zn(II) (2) and Cd(II) (3); hepH = 2-pyridineethanol), have been synthesized and characterized by elemental analysis, FT-IR and Raman spectroscopies, thermal analysis, and single-crystal X-ray diffraction techniques. The crystallographic analyses reveal that 1 and 2 crystallize in the triclinic system, space group P-1, while 3 crystallizes in the monoclinic system, space group P2₁/n. The structures of 1–3 consist of 1-D linear chains in which the M(II) and Pt(II) ions are linked by cyanide ligands. Each M(II) center exhibits a distorted octahedral coordination environment with four nitrogens from two cyanides and two hepH ligands. The 1-D chains are further linked by C–H⋯Pt and O–H⋯N hydrogen bonding interactions to construct 3-D supramolecular structures. Thermal stabilities and decomposition products of the complexes were investigated from 30 to 700 °C in air.

Graphical abstract

New cyanide-bridged heteronuclear polymeric complexes, [Cu(hepH)₂Pt(μ-CN)₂(CN)₂]_n (1), [Zn(hepH)₂Pt(μ-CN)₂(CN)₂]_n (2), and [Cd(hepH)₂Pt(μ-CN)₂(CN)₂]_n (3) (2-pyridineethanol abbreviated to hepH), have been synthesized and characterized by elemental analysis, FT-IR and Raman spectroscopies, thermal analysis, and single-crystal X-ray diffraction techniques. Hydrogen bonds play very important roles in the construction of supramolecular structures. From the crystallographic data, it was determined that the crystal packings of 1–3 were composed of rare intermolecular C–H⋯Pt interactions. In addition, these complexes have π⋯π and O–H⋯N interactions.

Keywords:

• Tetracyanoplatinate(II) complex
• 2-Pyridineethanol complex
• Heteronuclear complex
• Cyanide-bridged complex
• 1-D complex

Acknowledgement

This work was supported by the Research Fund of Eskişehir Osmangazi University (Project No. 201419A207). The authors are indebted to Anadolu University and the Medicinal Plants and Medicine Research Centre of Anadolu University, Eskişehir, Turkey, for the use of X-ray diffractometer.

Disclosure statement

No potential conflict of interest was reported by the authors.