TY - JOUR
T1 - Synthesis, crystal structures, and luminescence of organic-lanthanide complexes with nicotinate and isonicotinate ligands
AU - Jia, Guohua
AU - Law, Ga-Lai
AU - Wong, Ka-Leung
AU - Tanner, Peter A.
AU - Wong, Wing-Tak
PY - 2008/10/20
Y1 - 2008/10/20
N2 - Six lanthanide coordination compounds with two isomeric carboxylic acids, nicotinic acid (HL1) and isonicotinic acid (HL2), [(L 1)3Ln(H2O)2]2 (Ln = Eu, 1; Gd, 2; Tb, 3) and [(L2)2Ln(H2O) 4][NO3] (Ln = Eu, 4; Gd, 5; Tb, 6), have been synthesized and structurally characterized by single-crystal X-ray diffraction. Complexes 1-3 are dimeric whereas 4-6 are polymeric, all with 8-coordination of Ln 3+. The distinction between these lanthanide complexes is readily accomplished from the 10 K high resolution electronic emission spectra. Spectral interpretation is given for the Eu3+ complexes 1, 4, whereas the spectra of 3 and 6 are more complex. The relationships between spectroscopic and crystallographic site symmetries are discussed. The calculated second rank crystal field strengths of Eu3+ in 1 and 4 are intermediate in magnitude. © 2008 American Chemical Society.
AB - Six lanthanide coordination compounds with two isomeric carboxylic acids, nicotinic acid (HL1) and isonicotinic acid (HL2), [(L 1)3Ln(H2O)2]2 (Ln = Eu, 1; Gd, 2; Tb, 3) and [(L2)2Ln(H2O) 4][NO3] (Ln = Eu, 4; Gd, 5; Tb, 6), have been synthesized and structurally characterized by single-crystal X-ray diffraction. Complexes 1-3 are dimeric whereas 4-6 are polymeric, all with 8-coordination of Ln 3+. The distinction between these lanthanide complexes is readily accomplished from the 10 K high resolution electronic emission spectra. Spectral interpretation is given for the Eu3+ complexes 1, 4, whereas the spectra of 3 and 6 are more complex. The relationships between spectroscopic and crystallographic site symmetries are discussed. The calculated second rank crystal field strengths of Eu3+ in 1 and 4 are intermediate in magnitude. © 2008 American Chemical Society.
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U2 - 10.1021/ic8010103
DO - 10.1021/ic8010103
M3 - RGC 21 - Publication in refereed journal
SN - 0020-1669
VL - 47
SP - 9431
EP - 9438
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 20
ER -