Other Binary Compounds

The mineral laurite is the mixed sulphide (Ru,Os)S2 this and RuS2 and OsS2 have the pyrite structure as does RuQ2 (Q = Se, Te). These can be made from the reaction of the chalcogen with the metals, while RuCl3 will also react with Se and Te. 

MAs2 and MSb2 all have a compressed form of the marcasite structure, while the carbides MC have trigonal prismatic coordination in the WC structure. Several borides are known MB2 has nets of boron atoms. RunB8 has branched chains while Ru7B3 has isolated borons. 

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Three other binary compounds of molybdenum and fluorine are known to exist molybdenum trifluoride [20193-58-2] MoF, molybdenum tetrafluoride [23412-45-5] MoF, and molybdenum pentafluoride [13819-84-6] MoF. Also known are the two oxyfluorides, molybdenum dioxydifluoride [13824-57-2] M0O2F2, and molybdenum oxytetrafluoride [14459-59-7] MoOF. The use of these other compounds is limited to research appHcations. 

SiC has greater thermal stability than any other binary compound of Si and decomposition by loss of Si only becomes appreciable at 2700°. It resists attack by most aqueous acids (including HE but not H3PO4) and is oxidized in air only above 1000° because of the protective layer of Si02 this can be removed by molten hydroxides or carbonates and oxidation is much more rapid under these conditions, e.g. ... 

Other binary compounds include MAs3 (M = Rh, Ir), which has the skutterudite (CoAs3) structure [33] containing As4 rectangular units and octahedrally coordinated M. The corresponding antimonides are similar. M2P (M = Rh, Ir) has the anti-fluorite structure while MP3 has the CoAs3 structure. In another compound of this stoichiometry, IrSi3, 9-coordination exists for iridium. 

Other Binary Compounds.—Scandium nitride and zirconium and titanium carbide do not conform with the theoretical radii. It is possible that these crystals do not consist essentially of Sc+3, N 3, Ti+4, Zr+4 and C-4 ions, especially since zirconium and titanium nitride, ZrN and TiN, also form crystals with the sodium chloride structure but possibly also the discrepancy can be attributed to deformation of the anions, which have very high mole refraction values. 

Binary compounds are compounds that consist of only two elements. Some binary compounds have special names, and these special names supersede any of the rules given below. H20 is water, NH3 is ammonia, and CH4 is methane. All other binary compounds have a name with a suffix ide. Binary compounds may be subdivided into metal type, nonmetal type, and acid type. 

The ternary oxides M3AUO (M = Rb, Cs) contain Au , however [34], Other binary compounds include the very insoluble black Ag2S... 

Besides carbon snlfrdes CS and CS2, described in previous sections, some other binary compounds of sulfur and carbon have been known for a long time, such as C3S2 and the two isomers of C4S6 and C9S9. In the latter, extensive delocalization leads to the formation of disulfide bonds within linear three-sulfur sequences, and the molecule is sometimes considered to be a carbon-sulfur analogue of coronene (Figure 5). ... 

The above model similarly applies to the successful synthesis of GaN and GaP and other binary compounds. Figures 10.23 and 10.24 show the typical HRTEM... 

When atomic theory developed to the point where it was possible to write specific formulae for the various oxides and other binary compounds, names reflecting composition more or less accurately then became common no names reflecting the composition of the oxosalts were ever adopted, however. As the number of inorganic compounds rapidly grew, the essential pattern of nomenclature was little altered until near the end of the 19th century. As a need arose, a name was proposed and nomenclature grew by accretion rather than by systematization. 

This chapter is concerned with the thermal decompositions of oxides and peroxides. There are obviously very important connections with the reactions of hydroxides (Chapter 8) and so-called peroxysalts, which contain hydrogen peroxide of crystallization (included in Chapter 7 on hydrates). Hydrated oxides vary from compounds accurately represented by the stoichiometric formula M(OH) , to phases which contain discrete HjO molecules. The chemistry of oxides should also be considered in the context of the other binary compounds (e.g. hydrides, nitrides, carbides, sulphides etc.) dealt with in Chapter 10. 

Reaction rates may be determined by the ease of intracrystalline transport to the surface, or by the chemical change on the surface. These surface reactions often resemble behaviour described in modelling heterogeneous catalytic processes and are usually reversible so that decomposition rates are sensitive to any gases present. Behaviour of reactants of the present group is similar to that of the oxides (Chapter 9), which are in the same class. Little information is available for other binary compounds, fluorides, chlorides, etc., which usually melt rather than decompose. 

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