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Crystal Structure and Spectroscopic Studies of a Dimeric Europium(III) β‐Diketonate Complex Containing [3‐(2‐Pyridyl)‐1‐pyrazolyl]acetate
Author(s) -
Coelho Ana C.,
Gomes Ana C.,
Fernandes José A.,
Paz Filipe A. Almeida,
Braga Susana S.,
Rino Luís,
Pereira Luiz,
Pillinger Martyn,
Gonçalves Isabel S.
Publication year - 2014
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.201301520
Subject(s) - chemistry , europium , carboxylate , luminescence , chelation , ligand (biochemistry) , crystal structure , lanthanide , crystallography , photoluminescence , crystallization , recrystallization (geology) , hydrolysis , bridging ligand , medicinal chemistry , ion , stereochemistry , inorganic chemistry , organic chemistry , paleontology , biochemistry , physics , receptor , optoelectronics , optics , biology
The homodinuclear europium(III) β‐diketonate complex [Eu 2 (bta) 4 (pypzCH 2 COO) 2 ] ( 1 ) {bta = 1‐benzoyl‐3,3,3‐trifluoroacetonate, pypzCH 2 COO = [3‐(2‐pyridyl)‐1‐pyrazolyl]acetate} was isolated after recrystallization of the crude product obtained from the reaction of [Eu(bta) 3 (H 2 O) 2 ] with one equivalent of the ligand phenyl[3‐(2‐pyridyl)‐1‐pyrazolyl]acetate (pypzCH 2 CO 2 C 6 H 5 ). A single‐crystal X‐ray diffraction study confirmed that during the recrystallization the hydrolysis of the ester group in pypzCH 2 CO 2 C 6 H 5 took place to give pypzCH 2 COO – , which culminated in the crystallization of dinuclear complex 1 in which each Eu 3+ ion is coordinated to two O , O′ ‐chelated bta – groups and one N , N′ ‐chelated pyrazolylpyridine ligand, and the two metal centers are linked by tridentate chelating–bridging (μ 2 ‐η 2 ,η 1 ) carboxylate groups. The luminescence properties of 1 were investigated by steady‐state photoluminescence (PL), PL excitation, and time‐resolved PL.