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Syntheses, Crystal Structures and Photophysical Properties of Two Doubly μ‐Phenoxo‐Bridged Ln III (Ln = Pr, Nd) Homodinuclear Schiff Base Complexes
Author(s) -
Chakraborty Joy,
Thakurta Santarupa,
Pilet Guillaume,
Ziessel Raymond F.,
Charbonnière Loïc J.,
Mitra Samiran
Publication year - 2009
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.200900251
Subject(s) - chemistry , lanthanide , schiff base , ligand (biochemistry) , crystallography , square antiprism , luminescence , photoluminescence , crystal structure , ion , stereochemistry , biochemistry , physics , receptor , optoelectronics , organic chemistry , optics
Two novel homodinuclear isomorphous lanthanide(III) complexes [Ln(api)] 2 (where Ln = Pr and Nd for 1 and 2 , respectively) with Schiff base anion api 3– {H 3 api = 2‐(2‐hydroxyphenyl)‐1,3‐bis[4‐(2‐hydroxyphenyl)‐3‐azabut‐3‐enyl]‐1,3‐imidazolidine} have been synthesized by a direct reaction of the Schiff base ligand and the corresponding hydrated lanthanide(III) nitrates in methanol. The geometry of each Ln III ion in both complexes is distorted square antiprism (DSAP) as revealed by single‐crystal X‐ray diffraction studies and the structures are found to be centrosymmetric. Both the complexes along with the ligand have been characterized by microanalysis and different spectroscopic techniques. A detailed photophysical investigation has been performed on both the ligand and the complexes. The fluorescence lifetime for the ligand is in the nanosecond regime, suggesting emission from a singlet state. The two lanthanide complexes exhibit NIR luminescence which has been explored throughsolid‐state photoluminescence. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)