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There is some controversy as to whether or not oxygen should be considered a chalcogen. The term chalcogen appears to have developed directly from the words "chalkosphäre" and "chalkophile", coined in the earlier part of this century by Goldschmidt, a geochemist [2a,b]. Goldschmidt used "chalkosphäre" to describe a region of the earth that is rich in metal oxides and sulfides, i.e. ores, while "chalkophile" was used to describe elements found in this region (e.g. Fe, Cu, Zn). Since these names derived from the Greek word "chalkos" (χαλκoσ) meaning copper, a literal translation of chalcogen is "copper-former". However, Jensen has rationalized that since "chalkos" may also be interpreted as copper alloy or ore, and since copper is not the only element considered to be a "chalkophile", a more pertinent interpretation of the term chalcogen is "ore-former" [2c]. Consequently, oxygen is appropriately considered to be a chalcogen, a term that has, in fact, been approved by IUPAC as the collective name for the group 16 elements : O, S, Se, Te, Po [2d]. (a) Goldschmidt, V. M., J. Chem. Soc. (London), 1937, 655 ;
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85033527169
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note
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A crude estimate of the relative number of studies on elements of the second and third transition series may be obtained by examining the number of papers that cite these elements themselves either in the title or abstract. For example, using the names of the elements as keywords, there are ca 25% more listings in the Science Citation Index (1982-1996) for the elements of the second transition series than for the third transition series.
-
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49
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85033512740
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note
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+] bonds. For simplicity, however, in this paper we use the representation [M=E] to refer generally to any terminal chalcogenido moiety, regardless of bond order.
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85033514710
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note
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The mean W-S single bond length (2.390 Å, with a range of 2.107-2.721 å) is that for complexes in which sulfur is two-coordinate.
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Some related problems in ligand assignment have been noted with the reformulation of complexes originally proposed to be alkoxides as, in fact, alcohol derivatives. See : Koch, S. A. and Lincoln, S., Inorg. Chem., 1982, 21, 2904.
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3 [1.803(11) Å] is considerably longer than the mean value (1.678 Å) reported by Mayer for mono-oxo molybdenum complexes.
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85033505585
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Mayer has noted, however, that M=O bond lengths do increase slightly in the presence of a second multiply bonded ligand (e.g. oxo, nitrido, imido).
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The metallic radii of the transition elements are effectively identical to the covalent radii derived by consideration of the bond lengths (Å) in diatomic MH molecules: Ti (1.324), V (1.224), Cr (1.176), Mn (1.171), Fe (1.165), Co (1.162), Zr (1.454), Nb (1.342), Mo (1.296), Tc (1.271), Ru (1.246), Rh (1.252), Hf (1.442), Ta (1.343), W (1.304), Re (1.283), Os (1.260), Ir (1.265). Data taken from Pauling, L. The Nature of the Chemical Bond, 3rd edn. Cornell University Press, Ithaca, 1960, p. 256.
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