Add time:08/05/2019         Source:sciencedirect.com

The structures of the N,N′-dimethylpropyleneurea (DMPU) solvated gallium(III) and indium(III) ions have been determined in DMPU solution by means of EXAFS. The gallium(III) ion is five-coordinate with a mean Ga–O bond distance of 1.924(5) Å, while the larger indium(III) ion is octahedrally coordinated with a mean In–O bond distance of 2.146(3) Å. The complex formation equilibria in DMPU for the gallium(III) and INDIUM(III) BROMIDE (cas 13465-09-3) systems have been studied calorimetrically at 298 K. Three relatively strong complexes are formed in the indium(III) bromide system in DMPU, whereas no stability constants could be established in the gallium(III) bromide system as the heats of complex formation were very close to zero. Gallium(III) bromide is present as DMPU solvated GaBr3 complexes in solution with three equatorial Ga–Br bonds at 2.328(3) Å, and two Ga–O bonds at 1.92(3) Å in the apical positions of a distorted trigonal bipyramid. The DMPU solvated indium(III) bromide has the same configuration with a mean In–Br bond distance of 2.510(3) Å, and two In–O bonds at 2.201(6) Å. Indium(III) binds three bromides and three Me2SO molecules through the oxygen atoms in octahedral fac-configuration with mean In–Br and In–O bond distances of 2.630(3) and 2.211(15) Å, respectively.

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