Bond length average

TABLE 2.5 Bond Average and Actual Bond Lengths Average bond length (pm) Molecule Bond length (pm)... 

The only simple diphosphide complex in Table IV is /-Bu-Ga(PHMes ")2,82 which has Ga—P bond lengths averaging 2.325 A. This distance is, with one exception, longer than those observed in the monophosphide complexes. This is consistent with a weak but significant gallium-phosphorus 7r-interaction where competition between two phospho-... 

The rather complicated indium-phosphorus cluster framework 24 was obtained by the reaction of indium(III) chloride with PhP(SiMe3)2 in the presence of triethyl-phosphane [Eq. (12)] [29]. Apparently, a complex redox process occurred, in the course of which phosphorus atoms were oxidized by the formation of three P-P bonds, while six indium atoms were reduced from +3 to +2 accompanied by the formation of three In-In bonds. The In-In (average 274 pm) and P-P bond lengths (average 222 pm) represent localized single bonds. Other strategies for the... 

The phosphoryl groups retain considerable double bond character (P 0 = 1.53 A). The Ce-O(P) bond lengths (average 2.219 A) are shorter than the Ce-OaNO bond lengths (average 2.479 A). 

The aluminium is coordinated by three silylamido nitrogens in an essentially trigonal planar fashion ( °A1 = 359.7(3)) with coordination by the amine nitrogen in an axial position. The Al—N(amido) bond lengths average 1.809(3) A and the axial Al—N(amine) distance is 1.983(6) A The related podand derivatives [ HC(SiMe2NR)3 Al thf] (R CHsPh or C6H4Me-4 2), synthesized by salt elimination reactions, were reported recently. 

Fig. 43. [Re,C(CO)24p, 35, as in its Et4N+ salt (77). The Re, polyhedron comprises a trans-bicapped octahedron, with the carbide carbon at the center of the octahedral cavity (mean Re-C = 2.12 A). Re- Re bond lengths average 2.993 A within the octahedron and 2.970 A for bonds to the capping atoms. There are three terminal carbonyls per metal atom, and the anion has overall D d symmetry.

The two rhodium centers are distinctly nonequivalent in the solid state. The Rh(l)-P(l) and Rh(l)-P(2) bond lengths (see Table IV) are insignificantly different and are both shorter than the Rh(2)-P(3) and Rh(2)-P(4) bond lengths. The Rh(l)-P bond lengths (averaging 2.250(6) A) are the shortest ever observed in a triisopropylphosphine-rhodium structure. Values found previously in low-temperature struc-... 

Fig. 36 Definition of parameters a used in Tables 1 and 2. Each a value is a root mean square deviation calculated for the set of C-C bond lengths shown in bold. Low a values (<1.5 pm) are indicative of bond length averaging. The expected value for an alternating pattern of pure single and double bonds is ca. 6 pm [287]...

The X-ray structure of a tritellurole, cz s-3,5-dibenzylidene-l,2,4-tritellurole (13), has been reported (81TL4199). The tritellurole was shown to have a non-planar heterocyclic system in which the ditelluride bond forms a dihedral angle of 35.9° with the other three ring atoms. The Te—C bond lengths averaged 2.125 and the Te—Te bond length was shown to be 2.710 A. 

When 2 forms a complex with Pt(PF6>2, the Pt2+ lies at an inversion center surrounded by a distorted square planar array of four atoms. The two oxygen atoms lie trans to each other and oriented away from the Pt center, precluding any Pt-O interactions. In the complex, the S-O-S unit adopts a meridional rather than facial coordination mode. The Pt-O distances in 2-Pt(PF6)2 complex is 3.730(5) A and the Pt-S bond lengths average 2.317(2) A. In this structure, the platinum(n) ion lies 0.018 A above the mean plane of the four sulfur atoms. 

Compound (RMgX L2) Bond angles (°) Bond lengths (averaged. A) Ref. 

---