Synthesis, crystal structures, and luminescence of organic-lanthanide complexes with nicotinate and isonicotinate ligands

Guohua Jia, Ga Lai Law, Ka Leung Wong, Peter A. Tanner, Wing Tak Wong

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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.
Original languageEnglish
Pages (from-to)9431-9438
Number of pages8
JournalInorganic Chemistry
Issue number20
Publication statusPublished - 20 Oct 2008
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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