Optical spectroscopy and structure of neodymium complexes with 2,6-pyridine-dicarboxylic acid in solution and single crystal at room and low temperatures

• Published in: Journal of alloys and compounds Vol. 225; no. 1; pp. 367 - 371
• Main Authors: Mondry, A., Starynowicz, P.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-07-1995
• Subjects: Absorption; Intensity analysis; Nepheloauxetic effect; X-Ray structure; Intensity analysis; Absorption; X-Ray structure; Nepheloauxetic effect
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/0925-8388(94)07041-5

X-ray characterization of a compound reported as Na
3[Nd(dpa)
3]·15H
2O by Albertsson was repeated and it was found to be a 14-hydrate. Absorption spectra of the crystal were measured along the
a axis at room temperature and at 5 K. The results for the crystal were compared with those for Nd(III) aquoion and Nd(III)-dipicolinate solutions. Intensities of the f-f transitions were analyzed according to the Judd-Ofelt theory. The good correspondence between the values of oscillator strength of the hypersensitive transition for [Nd(dpa)
3]
3− complex in solution and in the crystal suggests an analogy between the coordination polyhedra; however, the crystal field splitting is different, best seen for the
4
I
9
2
→
2
P
1
2
transition. The contribution of polarization and electrostatic field mechanisms to the oscillator strengths is discussed.