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Synthesis, Crystal Structure, and Near‐IR Luminescent Properties of Lanthanide Bis(β‐diketonate) Complexes
Author(s) -
Hou Yanjun,
Shi Jing,
Chu Wenyi,
Sun Zhizhong
Publication year - 2013
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201300013
Subject(s) - chemistry , lanthanide , denticity , luminescence , crystallography , alkyl , crystal structure , bipyridine , ion , ether , photochemistry , organic chemistry , materials science , optoelectronics
A bis(β‐diketone), 1,3‐bis(4,4,4‐trifluoro‐1,3‐dioxobutyl)phenyl (BTP), which contains a trifluorinated alkyl group, has been exploited to obtain three series of visible‐light sensitive dinuclear rare‐earth complexes with the general formula [Ln 2 (BTP) 3 L 2 ] [Ln = Nd, L = DME ( 1 ), bpy ( 2 ), and phen ( 3 ); Ln = Yb, L = DME ( 4 ), bpy ( 5 ), and phen ( 6 ); Ln = Er, L = DME ( 7 ); DME = ethylene glycol dimethyl ether, bpy = 2,2′‐bipyridine, phen = 1,10‐phenanthroline]. An X‐ray crystallographic analysis revealed that complexes 1 , 2 , 4 , 5 , and 7 are triple‐stranded helical dinuclear structures that are formed by three bis(bidentate) ligands with two lanthanide ions. The room‐temperature near‐IR luminescent properties of complexes 1 – 6 show that this bis(β‐diketone) can effectively sensitize rare earths (Nd 3+ , Yb 3+ ) and produce typical near‐infrared luminescence upon excitation with visible light of the corresponding Nd 3+ and Yb 3+ ions. Additionally, two bidentate nitrogen ancillary ligands, 2,2‐bipydine (bpy) and 1,10‐phenanthroline (phen), have been applied to enhance the NIR luminescent properties.