Different crystal structure and photophysical properties of lanthanide complexes with 5-bromonicotinic acid

Journal Article · Fri Oct 01 04:00:00 EDT 2004 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2004.07.035· OSTI ID:20653401

Yishan, Song ^[1]; Bing, Yan ^[1]; Zhenxia, Chen ^[2]

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1. Department of Chemistry, Tongji University, Siping Road 1239, Shanghai 200092 (China)
2. Department of Chemistry, Fudan University, Shanghai 200433 (China)

Five novel lanthanide (Eu{sup 3+} (1), Tb{sup 3+} (2), Sm{sup 3+} (3), Dy{sup 3+} (4) and Gd{sup 3+} (5)) complexes with 5-Bromonicotinic acid (5-Brnic) were synthesized and two of them (Tb{sup 3+}, Sm{sup 3+}) were characterized by X-ray diffraction. The results reveal that {l_brace}[Tb(5-Brnic){sub 3}(H{sub 2}O){sub 3}]{center_dot}H{sub 2}O{r_brace}{sub n} (2) and [Sm(5-Brnic){sub 3}(H{sub 2}O){sub 2}{center_dot}H{sub 2}O]{sub 2} (3) exhibit different coordination geometries and crystal structures. Complex 2 has a one-dimensional chain-like polymeric structure through the bridged 5-Brnic anions which links up two neighboring terbium ions, while Complex 3 forms a dimeric molecular structure. The lowest triplet state energy of 5-Brnic was determined to be 24 330 cm{sup -1} corresponded to the 0-0 transition in the phosphorescence spectrum of its gadolinium complex at 411 nm. The strong luminescent emission intensities of these complexes indicated that the triplet state energy of 5-Brnic is suitable for the sensitization of luminescence of Eu{sup 3+}, Tb{sup 3+}, Sm{sup 3+} and Dy{sup 3+}, especially for that of Tb{sup 3+} and Dy{sup 3+}.

• OSTI ID: 20653401
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 10 Vol. 177; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ANIONS
CRYSTAL STRUCTURE
DYSPROSIUM IONS
EUROPIUM IONS
GADOLINIUM COMPLEXES
GADOLINIUM IONS
MOLECULAR STRUCTURE
PHOSPHORESCENCE
SAMARIUM IONS
TERBIUM IONS
TRIPLETS
X-RAY DIFFRACTION