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Additional info for Chelating Agents and Metal Chelates
One is that outer d orbitals of iron are used when the ligand is one of high elec tronegativity like fluorine. T h e proposed electron distribution under these circumstances is shown in Scheme 2. : [FeF ] 6 3d i i i 4s AP 4d it i A s a means of indicating this, the complex is3 described as an outerorbital complex to distinguish it from [ F e ( C N ) ] ~ which, in contrast, is 6 called an inner-orbital complex. There is, however, still some d o u b t whether outer d orbitals are used in the fluoride complex.
Chemical methods are based essentially on the study of t w o main types of isomerism—geometrical and optical. a. Geometrical Isomerism. There are three possible types of regular arrangement of six atoms about a seventh: (1) hexagonal (planar); (2) trigonal prismatic; (3) octahedral. For structures of the t y p e [ M A 2B 4] , three isomers are possible for (1) and (2) and t w o for ( 3 ) . T w o only have been found. In this negative kind of way, isomer counts support the octahedral configuration.
London) 12, 265. Am. Chem. Soc. 61, 1087. , and Corey, R . B. (1939). Alexander, W . , and Pauson, P. L. (1961). J. Inorg. & Nuclear Chem. 17, 186. Arrhenus, S. (1887). Z. physik. Chem. (Leipzig) 1, 631. Chem. Soc. p. 586. Barclay, G. , and Hoskins, B. F. (1962). Barclayi, G. , and Nyholm, R . S. (1953). Chem. & Ind. (London) p . 378. , and Pearson, R . G. (1958). " Wiley, New York. , and Sillen, L. G. (1957). " Chem. Soc. (London) Spec. Publ. No. 7. Blau, F. (1898). Monatsh. 19, 647. Blomstrand, C.