Tris complexes gallium

The known sequestering ability of various hydroxypyridi-nones for iron(III) prompted investigation of the gallium complexes. The tris complexes have been prepared with a wide... 

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). 

Gallium.—The rate of extraction of Ga + into chloroform containing thenoyltri-fluoroacetone (A) to form the tris-complex GaAj follows the rate law below, and is thought to involve GaOH + and A . 

Metallotropic rearrangement, in mercury tri-azenide complexes, 30 41 Metals, see also Heterobimetallics specific element Transition metal complex alkoxides, 15 159-297 of actinides, 15 290-293 of alkali metals, 15 260-263 of alkaline earths, 15 264-266 of aluminium, 15 266-272 of beryllium, 15 264-266 double type, 15 293-294 of gallium, 15 266-272 of lanthanides, 15 290-293 of magnesium, 15 264-266 properties of, 15 260 of transition metals, 15 272-290 trialkylsilyloxides, 15 295-297 of zinc, 15 264-266... 

For rearrangement reactions of the kinetically fast variety, i.e., for complexes which are stereochemically nonrigid, DNMR techniques have in several cases permitted detailed mechanistic conclusions via the observation of site interchanges.s-8 The first experiments were carried out by Fay and Piper15 on tris(trifluoroacetylacetona-to) complexes of aluminum(III), gallium(III) and indium(III), 3, using 19 F DNMR. These complexes which are members of the class of octahedral tris chelates M(A—B)3... 

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. 

The triazenide anion, RN=N NR, is formally isolobal with the carboxylate anion. However, while there are no well-characterized examples of gallium tris-carboxylates (see Section 8.7), the (hT-diphenyltriazenide) complex Ga(dpt)3 (14) has been isolated and fully characterized. ... 

Other studies involving the self-assembly of tri-stranded, non-chiral complexes composed of three bis(catecholate) ligands wrapped around two titanium(IV) ions have been reported. The self-assembly of gallium(III) catecholamide triple helices has also been investigatedalong with the assembly and racemisation of helicates incorporating linked catechol derivatives and either titanium(IV) or... 

FIGURE 22.10 (a) Gold (I) phosphole complex (b) KP46 (c) Gallium tris-maltolate. 

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