Synthesis, characterization and magnetic properties of cyanide bridged 1-D metal-coordination polymers based on [Fe^III(s-bqdi)₂(CN)₂]⁻

Abstract

A new series of transition metal complexes K[M^II(s-bqdi)₂][Fe^III(s-bqdi)₂(CN)₂] · 10H₂O (s-bqdi = semibenzoquinonediiminate, M^II = Co (2), Ni (3), and Cu (4)) have been synthesized. These complexes have been characterized by elemental analyses, FT IR, Far IR, FAB mass, UV-Vis, TGA, CV measurements, and powder XRD. The powder XRD patterns of 2, 3, and 4 show that they are isostructural with hexagonal primitive lattice structures. The coordination polymers display 1-D chain networks. Magnetic properties of the Co^IIFe^III complex studied by a SQUID magnetometer reveal low-temperature antiferromagnetic interaction.

Keywords:

• 1-D chain
• Semibenzoquinonediiminate
• Hexagonal primitive
• Antiferromagnetic interaction

Acknowledgments

The authors thank the Head, Department of Chemistry B.H.U., Varanasi- 221005 for providing laboratory facilities. The authors also thank Mr Suryanarayan Das and Mr Kranti Kumar Sharma for providing help in magnetic data recording and Dr P. Srivastava for recording CV and facilitating discussion of the results. They also thank BHU for research scholarship; Dr A. Singh (I.T., B.H.U.) for recording X-ray powder pattern and facilitating discussion of the results; CDRI, Lucknow for FAB mass; SAIF IIT, Mumbai for TGA analysis; Mr Satish Tiwari for CHN analyses; and Mr V.N. Pandey for IR and electronic spectra recording.