Oxygen deficient compounds

The calculated values do not exactly agree with those obtained by experiment if the explosion takes place in a bomb, the true compositions of the explosion products are different and, moreover, vary with the loading density. In accurate calculations these factors must be taken into account. In difficult cases (strongly oxygen-deficient compounds and side reactions, such as the formation of CH4, NH3, HCN, or HCI), the only way is to analyze the explosion products. For standard values of heats of formation at constant volume or constant pressure -> Energy of Formation. 

In the oxygen-deficient compound YBa2Cu306.6, shows a broad maximum... 

S. Noirault, S. C61erier, O. Joubert, M.T. Caldes, Y. Piffard, Incorporation of water and fast proton conduction in the inherently oxygen-deficient compound La26027(B03)g. Adv. Mater. 19, 867-870 (2007)... 

The development of molecular orbital theory (MO theory) in the late 1920s overcame these difficulties. It explains why the electron pair is so important for bond formation and predicts that oxygen is paramagnetic. It accommodates electron-deficient compounds such as the boranes just as naturally as it deals with methane and water. Furthermore, molecular orbital theory can be extended to account for the structures and properties of metals and semiconductors. It can also be used to account for the electronic spectra of molecules, which arise when an electron makes a transition from an occupied molecular orbital to a vacant molecular orbital. 

Unlike Lewis s theory, molecular orbital theory can account for the existence of electron-deficient compounds and the paramagnetism of oxygen. 

Several structural features, including electron transfer between atoms of different electronegativity, oxygen deficiency, and unsynchronized resonance of valence bonds, as well as tight binding of atoms and the presence of both hypoelectronic and hyperelectronic elements, cooperate to confer metallic properties and high-temperature superconductivity on compounds such as (Sr.Ba.Y.LahCuO,-,. 

Fullerene Ceo is an electron-deficient compound with rich photophysical and photochemical properties. Moreover, the triplet-excited state of Ceo is formed almost quantitatively and, in the presence of molecular oxygen, energy transfer from the triplet-excited... 

Operates in an oxygen-deficient environment, minimizing the generation of hazardous compounds during treatment. 

The exact synthetic chemistry which produces PAH in a fuel-rich flame is not well known, even today. It is clear, however, that PAH can be produced from almost any fuel burned under oxygen deficient conditions. Since soot is also formed under these conditions, PAH are almost always found associated with soot. As an example of the PAH assemblage produced by combustion systems. Figure 1 shows gas chromatographic mass spectrometry (GCMS) data for PAH produced by the combustion of kerosene ( ). The structures of the major compounds are also given in Figure 1. We draw the reader s attention to a number of features of this PAH mix-... 

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