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Luminescent Study on Nd 3+ Complexes Containing Carboxylate‐Dithiolene and Alkoxide‐Dithiolene Ligands
Author(s) -
Veith Michael,
Ndiaye Amadou L.,
Huch Volker,
Cui Hailing,
Wickleder Claudia
Publication year - 2008
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200800348
Subject(s) - chemistry , carboxylate , amide , ligand (biochemistry) , neodymium , luminescence , protonation , lanthanide , quenching (fluorescence) , crystallography , medicinal chemistry , photochemistry , stereochemistry , ion , fluorescence , materials science , organic chemistry , optoelectronics , optics , quantum mechanics , laser , biochemistry , physics , receptor
Reaction of ligand L H 2 (4,5‐bis[carboxymethylthio]‐1,3‐dithiol‐2‐thione) with neodymium silyl‐amide (Nd[N(TMS) 2 ] 3 ; TMS= ‐SiMe 3 ), in a ratio 2:1, yields a neodymium‐dithiolene‐carboxylato complex ( 1 ) (Nd( L H) L ). Similarly, reaction of 2 equivalents of L′ H 2 (4,5‐bis[2′‐hydroxyethyl)thio]‐1,3‐dithiol‐2‐thione) and one equivalent of neodymium silyl‐amide (Nd[N(TMS) 2 ] 3 ) allowed the isolation of complex 2 , with a ligand:metal ratio of 3:2. ATR‐IR spectrum of 1 displays a broad band characteristic of an OH group showing that one carboxylate group remains protonated. Emission spectrum of complex 1 under excitation in the visible region (at 360 nm i.e . on the ligand) displayed typical emission bands of the Nd 3+ , showing that energy transfer from the ligand to the lanthanide was achieved ( i.e. “antenna effect”). No significant quenching from the remaining –OH group was detected. In the case of complex 2 , the main emission bands characteristic of the Nd 3+ ion have been observed, by excitation at 495 nm.