NON-METAL OXIDES

Non-metal Oxides.—CO, SiO, and CS. The literature on CO is very extensive, and much early work is discussed in ref. 1, together with an analysis of recent extensive calculations on the valence excited states. O Neil and Schaefer313 carried out minimal-basis full Cl calculations on 72 states of CO at nine values of R. Seventeen bound states were predicted, eight of which have been observed experimentally, and the ordering is in agreement with experiment except for the a8II and A n states. Very detailed information is available in this investigation. 

An interesting recent study of the perturbations of the 3II and. 4 11 states of CO due to spin-orbit and rotational-orbit interactions has appeared.320 By including Cl functions built from HF orbitals optimized for each state, good agreement was obtained between theory and experiment in most cases, but the single-configuration approximation is seriously in error. 

Gaussian basis calculations on diatomics have been rather rare, but Vladimiroff331 

Green317 has also reported calculations on CS, both for the ground and A1 FT excited states. Agreement between theory and experiment for p was very good for both states. 

Spin-spin and spin-orbit constants for CO have been investigated using semi-empirical methods, for states which can be described by a single configuration.323 

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The other more electronegative elements are non-metals and form oxides which are entirely covalent and usually acidic. For example, sulphur yields the oxides SO2 and SO3, dissolving in bases to form the ions SO3 and SO4" respectively. A few non-metallic oxides are often described as neutral (for example carbon monoxide and dinitrogen oxide) because no directly related acid anion is known to exist. 

A final group of reactions are those involving water. A wide variety of materials such as the alkali metals light metals and their hydrides strong acids, such as sulphuric acid anhydrous metal oxides anhydrous metal halides and non-metal oxides ail react vigorously or violently with water under various circumstances. 

Zinc Arsenic trioxide See other NON-METAL oxides... 

See Potassium Non-metal oxides Sodium Non-metal oxides... 

See Barium peroxide Non-metal oxides Caesium oxide... 

See Monolithium acetylide-ammonia Gases Monopotassium acetylide Non-metal oxides Rubidium acetylide Non-metal oxides Sodium acetylide Non-metal oxides... 

Aluminium Aluminium halides, Carbon oxides Lithium Non-metal oxides Magnesium Carbon dioxide, etc. 

Potassium Non-metal oxides Potassium-sodium alloy Carbon dioxide Sodium Non-metal oxides Titanium Carbon dioxide Uranium Carbon dioxide... 

Metals, or Metal oxides, or Metal salts, or Non-metals, or Non-metal oxides... 

Non-metal oxides MRH Carbon monoxide 6.44/42, dinitrogen tetraoxide 1.00/45,... 

See Metal oxides, also Non-metal oxides, both above Selenium, etc., also Sulfur, and Sulfuric acid, all below Ammonium nitrate Ammonium sulfate, etc. 

See Acetonitrile, etc., also Non-metal oxides, both above... 

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