Lanthanide(III) coordination polymers from the exo-coordination of Na+: Syntheses, structures, luminescence, and decay dynamics

Autor:	Tanneika N. Dawkins, Marvadeen A. Singh-Wilmot, Alan J. Lough, Roxan U. Richards-Johnson
Rok vydání:	2007
Předmět:	Lanthanide Stereochemistry Kinetics Supramolecular chemistry Ion Inorganic Chemistry chemistry.chemical_compound Crystallography Salicylaldehyde chemistry Materials Chemistry Physical and Theoretical Chemistry Luminescence Trifluoromethanesulfonate Coordination geometry
Zdroj:	Inorganica Chimica Acta. 360:3727-3732
ISSN:	0020-1693
DOI:	10.1016/j.ica.2007.04.048
Popis:	[Na 2 [Ln 2 ( sal ) 4 (CF 3 SO 3 ) 2 (H 2 O) 4 ](CF 3 SO 3 ) 2 ] n Ln = Nd ( 1 ) and Eu ( 2 ) were synthesized from the reaction of salicylaldehyde, lanthanide(III) triflates, and sodium hydroxide. The compounds are iso-structural and possess a 2-D supramolecular network built up from discrete dinuclear Ln(III) units [Ln 2 ( sal ) 4 (CF 3 SO 3 ) 2 (H 2 O) 4 ] via exo-coordination of Na(CF 3 SO 3 ). The sal ligands display μ 2 -O coordination modes involving both the phenolic and carbonyl oxygen atoms while the triflates function as both μ 2 and μ 3 bridges. Each Ln(III) in the network is eight coordinate and in bicapped trigonal prism coordination geometry. Luminescence from [Na 2 [Eu 2 ( sal ) 4 (CF 3 SO 3 ) 2 (H 2 O) 4 ](CF 3 SO 3 ) 2 ] n showed temperature dependent sensitized emission with significant quadrupolar contribution and decay dynamical studies followed single exponential kinetics. Together these results indicate that in the presence of Na + ions, sal , and triflate are useful ligands in the construction of Ln(III) coordination polymers with unusual luminescence and structures.
Databáze:	OpenAIRE
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