Structures of the intermediate complex, {CpCo(dppe)[P(OMe)3]}2+, and final product, {CpCo(dppe)[P(O)(OMe)2]}+, from an Arbuzov transformation. A comment on the Lewis basicity of the phosphoryl oxygen atom

Heterometallic Mercury Compounds: Classification and Analysis of Crystallographical and Structural Data

“…The relevant data are given in Table 1 where the first three entries [4][5][6] have mercury with digonal coordination to two chlorine atoms. The next four examples have mercury(ll) atoms in trigonal environments of chlorine [7,8], iodine [9] and silicon [10]. The mean Hg-L bond distances of the trigonal species increase with the covalent radius of the coordinated atom: 241.5 pm (CI, 99pm) < 251.6 pm (SiL, 117 pm) < 269.0 pm (1,133 pm).…”

“…In this group of double salts of mercury(ll) there is an isolated monomeric mercury unit together with a heterometal unit, in which the coordination ranges from tetrahedral TeC 2 NCI [7], CON 4 [12], through pentacoordinate NaO s [14], hexacoordinate RhN 4 CI 2 [5], Mg0 6 [10], CrN 6 [11], TaCI 5 0 [13], K0 6 [16] and CoN 6 [17], hexa-plus heptacoordinate (K0 6 + K0 7 ) [15], to octacoordinate CoC 5 P 3 [9]. In one case [13] two TaCI 5 bi-tetrahedral structure about mercury is found.…”

“…The Etjdtc ligands asymmetrically chelate the mercury atoms. The mean Hg-Nb distance of 279.0 ( 13,18) pm is indicative of a metal-metal bond, with the mean Hg-Hg distance being 289.2 (9,9) pm. Here, the first number in parenthesis is the low range variation from the mean, and the second number is the high range variation from the mean.…”