Synthesis and structure of bis-μ-[(methylenedicyclopentanone-2,2′-dioximato)triphenylantimony]

Abstract

The reaction of pentaphenylantimony with methylenedicyclopentanone-2,2' dioxime affords bis-µ -[(methylenedicyclopentanone-2,2'-dioximato)triphenylntimony] having, according to the X-ray diffraction data, a centrosymmetric structure with two Ph 3 Sb moieties linked by dioxime bridges. The antimony atom has a distorted trigonal bipyramidal coordination. The Sb-C bond lengths vary in an interval of 2.111(1)-2.137(3) Å, and the Sb-O distances are equal to 2.064(1) and 2.0663(9) Å. The molecule contains short intramolecular contacts Sb···N of 2.876(1) and 2.910(1) Å.

Thermodynamic properties of pentaphenylantimony Ph5Sb over the range from T→0K to 400K

“…Their relative deviations from the smoothing C p;m ¼ f ðTÞ curve were ±0.5% over the range from T = (16 to 40) K and ±0.2% from T = (40 to 370) K. Shown in figure 1 are the deviations of our experimental heat capacities C p;m from values C p;mðfitÞ calculated from equation (1). The molar mass of the material studied was calculated from the IUPAC table of atomic weights [16].…”

“…This is due to the fact that these compounds can be used in preparative organometallic chemistry [1]. In addition, obtaining unknown antimony(V) organic compounds is interesting, because, as it was shown, the coordination number of the central atom in some antimony compounds can be equal to 6 [2], 7 [3], and 9 [4].…”