By M. Kumar, R. Gupta
The current quantity II/27 of Landolt-Börnstein sequence is a very revised and prolonged variation of quantity II/16. the current quantity comprises the huge literature of diamagnetic susceptibility and magnetic anisotropy in line with the literature survey of chemical abstracts as much as 2005. The symbols and terminology when it comes to diamagnetic susceptibility and magnetic anisotropy with their causes have additionally been provided. the current quantity II/27 has been equipped into 3 subvolumes: Subvolume II/27A : Diamagnetic susceptibility and magnetic anisotropy of inorganic and organo-metallic compounds. Subvolume II/27B : Diamagnetic Susceptibility of natural Compounds, Oils, Paraffins and Polyethylenes Subvolume II/27C : Diamagnetic susceptibility and magnetic anisotropy of natural compounds. the current subvolume II/27B comprises diamagnetic susceptibility of natural compounds. The calculated values of diamagnetic susceptibility of natural compounds have additionally been offered alongwith their experimental values. The calculated values of diamagnetic susceptibility were calculated with using structural parameters in structural formulation through the use of assorted theoretical equipment on hand within the literature. The theoretical equipment were offered in subvolume II/27A alongwith the experimental equipment. The natural compounds with their structural formulation were prepared by means of gross formulation utilizing Hill’s approach. The values of experimental diamagnetic susceptibility were expressed in either cgs and SI units.
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1007/978-3-540-45860-9_1 # Springer 2008 Landolt-Börnstein New Series II/27B Introduction 43 adjusting the weights) until the beam returns to its original position. This twist of the torsion head measures the force required to balance the magnetic force at zero position. The measurements are carried out for a standard substance of known magnetic susceptibility and for the substance under investigation. χs of the substance is calculated by equation (23). (ii) Optical arrangements: The force experienced by a sample in a magnetic ﬁeld is measured by an optical system consisting of a mirror, a lamp and a scale.
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The superposition-additivity approach provides reliable description of not only ortho- but also of peri-fused systems as well bridged systems, non-alternate hydrocarbons and molecules containing anti-aromatic rings. It can be extended to calculate diamagnetic susceptibilities of heterocyclic molecules, radicals, ions and carbene like species. It can also be used for the calculation of other physicochemical parameters. 20 Sub-structural graph theoretical approach [121-123] The sub-structural graph theoretical approach is quantitatively an additive method to calculate the diamagnetic susceptibility of organic compounds.
Diamagnetic Susceptibility of Organic Compounds, Oils, Paraffins and Polyethylenes by M. Kumar, R. Gupta