Variation in coordination modes of aromatic N-oxides in lanthanum(III) coordination polymers

Abstract

Two new coordination polymers of lanthanum(III) benzoate having pyridine N-oxide and 4,4′-bipyridyl-N,N′-dioxide as ancillary ligands are synthesized and characterized. Different binding modes of the N-oxide are demonstrated; pyridine N-oxide binds as a bridging ligand, whereas 4,4′-bipyridyl-N,N′-dioxide is monodentate.

Keywords:

• Coordination polymer
• Lanthanum(III) benzoate
• Pyridine N-oxide
• 4,4′-Bipyridyl-N,N′-dioxide
• Crystal structure

Acknowledgements

The authors thank the Department of Science and Technology, New Delhi, India, for financial support and R. Sarma thanks the Council of Scientific and Industrial Research, New Delhi, India, for Junior Research Fellowship.