Gallium halogens

Gallium Halogenates. The anhydrous galhum(III) perchlorate [19854-31-0], Ga(Q0 2 is obtained by reaction of chlorine peroxide, 0120, on GaCl at —180° C (34). The product is a white sohd and is stable at room temperature. 

For a number of organogallium halides self-assembly involves longer, secondary gallium-halogen bonds these are discussed in Section 4.3.1. 

The person whose name is most closely associated with the periodic table is Dmitri Mendeleev (1836-1907), a Russian chemist. In writing a textbook of general chemistry, Mendeleev devoted separate chapters to families of elements with similar properties, including the alkali metals, the alkaline earth metals, and the halogens. Reflecting on the properties of these and other elements, he proposed in 1869 a primitive version of today s periodic table. Mendeleev shrewdly left empty spaces in his table for new elements yet to be discovered. Indeed, he predicted detailed properties for three such elements (scandium, gallium, and germanium). By 1886 all of these elements had been discovered and found to have properties very similar to those he had predicted. 

Metal-halogen stretching vibrations in coordination complexes of gallium, indium and thallium. A. J. Carty, Coord. Chem. Rev., 1969,4, 29-39 (32). 

Like aluminum, gallium forms a series of GaYX compounds (Y = S,Se,Te X = Cl,Br,I) (160). Hardy and Cottreau (165) noticed that at least GaSCl and GaSBr do not correspond exactly to this stoichiometry. These phases are halogen-rich, according to the formula GagSgXn (X = Cl,Br). 

Formation of the Group-IIIB-Group-IIIB Element Bond 6.2.5. from Gallium in Halogen Acid Media... 

Instead of glowbars, as used in MIR, tungsten halogen lamps are the sources of light. The detectors are solid-state semiconductors such as lead sulfide (PbS) or indium gallium arsenide (InGaAs). These are orders of magnitude quieter than typical MIR detectors and often more sensitive. 

The mass spectrometric behavior (the types and abundance ratios of the fragments) shows variations from compound to compound depending on the changes of both the metal and halogen atoms. Substitution of aluminium by gallium or that of chlorine by bromine considerably decreases the stability of the molecular ion. 

Gallium(III) chloride also combines with other metal chlorides such as CaCls or CrCls to form mixed chlorides that have halogen bridge structures i.e., Cl4Ta(-Cl)2. Many such compounds are volatile. 

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