5 years ago

A Series of Dimeric Selenidogermanates with Lanthanide Complexes of Multidentate Chelating Amines


A series of lanthanide selenidogermanates (H3O)[Tm(teta)2][Ge2Se6] (1, teta = triethylenetetramine) and [Ln(teta)(tren)Cl]2[Ge2Se6](en) {en = ethylenediamine, tren = N,N,N- tris(2-aminoethyl)amine, Ln = Pr (2a), Nd (2b), Sm (2c), Eu (2d), Gd (2e), Tb (2f)}were prepared under mild solvothermal conditions and structurally characterized. 1 contains isolated [Tm(teta)2]3+ ions, protonated H3O+ ions and dimeric [Ge2Se6]4− anions, while 2af are composed of [Ln(teta)(tren)Cl]3+ ions, dimeric [Ge2Se6]4− anions and free en molecules. The lighter lanthanide ions (Pr–Tb) adopt a distorted tricapped trigonal prism with the nine-coordinated number, and the heavier Tm3+ ion adopts a distorted bicapped trigonal prism with the eight-coordinated number. Their band gaps in the range of 1.52–1.86 eV are derived from optical absorption spectra.

Publisher URL: https://link.springer.com/article/10.1007/s10876-017-1223-z

DOI: 10.1007/s10876-017-1223-z

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