Affiliation:
1. Institut für Anorganische und Analytische Chemie der Justus-Liebig-Universität, Heinrich-Buff-Ring 58, D-35392 Gießen
Abstract
Abstract
The Born-Haber Cycle (BHC) is critically reviewed, the origin of severe limitations in its appli cation is shown. Partly this is based on the construction of the third step, partly it is connected with the fact that most of the "classical" anions of inorganic chemistry are instable, "unobservable" gaseous entities. The Madelung Part of Lattice Energy, MAPLE*, is extentionally analyzed (e.g. TiO2) to demonstrate that the similarity of thermodynamical properties like ΔH°298 of all modifica tions, reflected in MAPLE, is non-trivial. The analogous analysis with e.g. BaTiO3 proves that neither the classical "central ion" (here Ti4+) nor the "completing" cation (here Ba2+) but the "anions" coordinating the last mentioned cation BaO gain energy and, in this sense, "stabilize" the complex. Even simple compounds (e.g. A-La2O3) show surprising geometrical arrangements, in striking contrast to often used but simple minded concepts like "Bond Length/Bond Strength" and its derivatives like CHARDI, whereas such "oddities" are explained by MAPLE. The application of the theorem of additivity of MAPLE (MAPLEpolynary = Σ MAPLEbinary), that passes even in the case of hydrates, and its limitations are discussed. Guided by MAPLE, surprisingly complicated structures (e.g. Cs2Li3I5) of polynary derivatives of structurally exceedingly simple binary com pounds become "understandable". If "molecular" entities like SO3 are involved, limitations can be excluded using "increments". Last not least, MAPLE is the first known guide to a multi-dimen-sional but strict scheme of characterisation of Solid State Structures in the sense of Linne's ideas, based on geometrical facts only.
Subject
Physical and Theoretical Chemistry,General Physics and Astronomy,Mathematical Physics
Cited by
38 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献