The Structure and Vibrational Spectra of Gallium(III) Fluoride Dimeric Complex with Tetramethylammonium Cation

Resumo

We have determined the crystal structure of gallium(III) fluoride dimeric complex [N(CH₃)₄]₂[Ga₂F₈(H₂O)₂], which is composed of [N(CH₃)₄]⁺ tetrahedral cations and [Ga₂F₈(H₂O)₂]^2– dimeric complex anions, formed by combining two slightly distorted GaF₅(H₂O) octahedral groups with a common F–F edge. By O–H···F hydrogen bonds, [Ga₂F₈(H₂O)₂]^2– dimeric complex anions unite into polymer chains, between which tetramethylammonium cations are located. Based on quantum-chemical calculations, we have assigned bands in vibrational spectra of the synthesized compound. Bands that refer to vibrations of anions, cations and H₂O molecules involved in hydrogen bonds have been identified in the spectra.