Gallium, tris structure

Dimethylcadmium reacts with gallium tris(di-terr-butyl phosphide), Ga(PBu 2)3, to give a trimeric derivative [MeCdPBuSJr crystal structure determination revealed cyclic self-assembly, 27, with trigonally planar coordinated cadmium and a tendency of bond length alternation in the six-membered ring (Cd-P 2.568 and 2.586 A) [49]. This compound serves as a precursor for cadmium phosphide (Cd3P2) nanoparticles [49a]. 

In this study, we report on the GaN nanorod growth by HOMVPE technique with or without using a new precursor, tris(N,N-dimethyldithiocarbamato)gallium(III) (Ga(mDTC)3). The structural and optical properties of GaN nanorods were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL). 

Figure 32 Syntheses and structures of dianionic di-, tri- and tetranuclear gallium compounds 446, 448, and 449.

The physical and chemical properties of the tetrahydroborates show more contrasts than the salts of nearly any other anion. The alkali metal salts are the most stable. In dry air, NaBH4 is stable at 300°C and in vacuo to 400°C with only partial decomposition. In contrast, several tetrahydroborates, including the titanium, thallium, gallium, copper, and silver salts, are unstable at or slightly above ambient temperatures. The chemical and physical properties of the tetrahydroborates are closely related to molecular structure. Sodium tetrahydroborate, which is typical of the alkali metal tetrahydroborates except for the lithium salt, has a face-centered cubic (fee) crystal lattice which is essentially ionic and contains the tetrahedral [BHJ- anion. The tetrahydroborates of the polyvalent metals are in many cases the most volatile derivatives of these metals known. Aluminum tris(tetrahydroborate)... 

Sulfur complexes of Al, Ga, and In are less common, but the tris(dithiocarba-mates), M(dtc)3, and thiolato anions, Ga(SR)4, are known. The gallium and indium compounds differ structurally from most other tris(dithiocarbamates) in their close approach to a prismatic arrangement of S atoms. 

Tris(acetylacetonato)gallium(III) exists in two crystallographic modifications, differing slightly in density. The X-ray crystal-structure determination shows the central GaOe core to be close to octahedral, with an average Ga-0 distance of 1.95 A. 

Since the determination of the structure of tris(acetylacetonato)scandium (Sc—O of 2.061-2.082 A, average Sc—O 2.070(9) A), several other diketonates have been examined, though no detailed structures have been reported. The compound mer-[Sc(CF3COCHCOCH3)3] is isostruc-tural with the aluminium, gallium, rhodium, and iridium analogues, as well as those of the 3d metals V-Co whilst the dipivaloylmethanide [Sc(Me3COCHCOMe3)3] is isostructural with the iron and indium analogues. Scandium a-diketonates such as [Sc(tropolonate)3] form adducts in... 

The most stable oxo-complexes are chelate compounds. Gallium and indium form tris- -diketone complexes, soluble in alcohol and benzene, and structurally similar to those of aluminium (Fig. 155). Gallium and thallium form trioxalato compounds like the oxalato-aluminates MJ[Ga ( 304)3]HgO. All the metals form tris-complexes with oxine (Fig. 156). 

Bendix J, Dmochowski U, Gray HB, Mahammed A, Simkhovich L, Gross Z (2000) Structural, electrochemical, and photophysical properties of gallium(III) 5,10,15-tris (pentafluorophenyl)corrole. Angew Chem Int Ed 39 4048-4051... 

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