The lanthanide coordination chemistry of the new ligand 2-hydroxy-2-(1-oxy-pyridin-2-yl)-N,N-diphenyl acetamide (5) has been examined. X-ray crystal structure determinations for the free ligand 5 and for one complex, [La(5)6] (NO3)3·7H2O, have been completed and the latter reveals an unexpected bidentate chelation mode for 5 that involves the amide carbonyl oxygen atom and the 2-hydroxy oxygen atom of each ligand. The six bidentate ligands generate an icosohedral inner coordination sphere. The N-oxide oxygen atom of each ligand also hydrogen bonds with a 2-hydroxyl hydrogen atom in a neighboring ligand molecule in the same molecular unit.
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Acknowledgement is made to the US Department of Energy (DOE), Chemical Sciences, Geosciences and Biosciences Office, Office of Basic Energy Sciences (Grant DE-FG02-03ER15419 ) for financial support at UNM (RTP) and (Grant DE-AC05-00OR22725 ) for financial support at Oak Ridge National Laboratory managed by UT-Battelle, LLC (BPH). We also acknowledge the contributions of Dr. S.-J. Kim to the early phase of this study.
- 2-(1-Oxypyridin-2-yl) acetamide ligand
- Hexakis-bidentate chelate
- La(III) complex