ISSN:
0570-0833
Keywords:
Chloride ligands
;
Halogen bridges
;
Bridging ligands
;
Chemistry
;
General Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The chemistry of the gaseous halide complexes which have been observed in large numbers in recent years is discussed for the example of chlorides. Homo-complexes - dimeric or polymeric chloride molecules containing chlorine-bridge linkages [e.g.(NaCl)n, n = 2 - 4; (CuCl)n, n = 2 - 5; (BeCl2)n, n = 2 - 4; Pd6Cl12] - occur through broad areas of the Periodic Table. Comparison of the dissociation enthalpy of such molecules with the vaporization enthalpy of the liquid chlorides is particularly informative. Hetero-complexes are formed from different chloride molecules by linkage through Cl bridges. Not only 1:1 complexes (e.g. NaAlCl4, TIPbCl3, KThCl5, CdPbCl4, AlUCl8) but also larger molecules (e.g. CoAl2Cl8, CrAl3Cl12, Cu2UCl6, In2UCl10) are known. Types of formulas, structures, and above all the formation enthalpies of such complexes are discussed critically. Hetero-complexes are useful in chemical transport reactions, as aids in syntheses, and in gas-chromatographic separations (lanthanoids, actinoids). They also play a part in many industrial processes (chlorination of ores) and in recently developed types of high-pressure discharge tubes.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/anie.197607131
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