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Near‐Infrared and Visible Luminescence from Terphenyl‐Based Lanthanide(III) Complexes Bearing Amido and Sulfonamido Pendant Arms
Author(s) -
Klink Stephen I.,
Hebbink Gerald A.,
Grave Lennart,
Peters Frank G. A.,
Van Veggel Frank C. J. M.,
Reinhoudt David N.,
Hofstraat Johannes W.
Publication year - 2000
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/(sici)1099-0690(200005)2000:10<1923::aid-ejoc1923>3.0.co;2-w
Subject(s) - chemistry , luminescence , terphenyl , lanthanide , coordination sphere , ligand (biochemistry) , photochemistry , quenching (fluorescence) , coordination complex , crystallography , crystal structure , ion , fluorescence , organic chemistry , metal , biochemistry , receptor , optoelectronics , quantum mechanics , physics
A series of m ‐terphenyl‐based ligands bearing three coordinating oxyacetate and two amido or two sulfonamido groups, ( 1a‐b )H 3 and ( 2 )H 3 , respectively, have been synthesized and characterized. The structures of the corresponding neutral complexes have been studied using 1 H‐NMR spectroscopy and luminescence experiments. The photophysical properties of the ( 1a‐b )Eu, ( 2 )Eu, ( 1a )Tb, and ( 2 )Tb complexes have been studied to determine the structure of the first coordination sphere in methanol. The first coordination sphere consists of eight donor atoms provided by the ligand (three chelating oxyacetate groups and two amide or sulfonamide oxygens), and one methanol molecule. The ( 1a )Dy and ( 1a )Sm complexes exhibited sensitized luminescence in the visible spectral region, but the luminescence intensity was very sensitive to quenching by C‐H groups. The near‐infrared emitting ( 1a )Ln and ( 2 )Ln complexes exhibited sensitized luminescence at wavelengths (at 880, 1060, and 1330 nm for Nd 3+ , at 980 nm for Yb 3+ , and at 1550 nm for Er 3+ ) of interest for applications in optical telecommunication devices. The luminescence lifetimes of these complexes in DMSO and [D 6 ]DMSO are in the range of microseconds. The luminescent state of the NIR emitting lanthanide ions is very efficiently quenched by high frequency oscillators (such as C‐H groups) in the solvent and the ligand.