Abstract
The single crystals of some lanthanide carboxylates are characterized by a lack of inversion symmetry, so they could be used for generation of the second harmonic. 1−5 Single crystals of neodymium and erbium trichloroacetate were synthesized and shown to form the polymeric chain linking dimeric subunits, where the lanthanide ions can occupy different site symmetry positions. The absorption and luminescence spectra of single crystals of the title compounds were measured at room and liquid helium temperatures; Stark components were determined and analysed in terms of interacting ions. Spectroscopic properties were related to the X-ray crystal data. Probabilities of f- f transitions depending on the orientation of biaxial single crystals were considered.
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