Structural nomenclature for polyboron hydrides and related compounds. 1. Closed and capped polyhedral structures

Structure of 3-(η2,η2-1,5-cyclooctadiene)-3-pallada-1,2-dicarba-closo-dodecaborane(11)

“…The final fractional coordinates are listed in B(5) B (7) molecule demonstrating the atomic numbering scheme B(8) adopted (Casey, Evans & Powell, 1983). Bond dis-B(9) B(10) tances and selected bond angles are listed in Table 2.…”

Structures of [HNEt3]+ and [Me3NCH2C6H5]+ salts of [7,8-Ph2-7,8-nido-C2B9H10]–

“…The preceding paper (Lewis & Welch, 1993a) reports the molecular structure of 1,2-Ph2-1,2-closo-C2BloHlo, noting the relatively long C(1)---C(2) connectivity [1.727 (6) A averaged over the two crystallographically independent molecules] and the low 0 values [0 is the average difference between 90 ° and the moduli of the C(cage)---C(cage)--C--C torsion angles] that describe the molecular conformation. Our interest in diphenylcarbaborane rests primarily in its use as a ligand to d-and f-block metals, predominantly in the partially degraded form [7, 2-[note the change in conventional numbering between related closo and nido polyhedra (Casey, Evans & Powell, 1983)]. We have already shown (Lewis & Welch, 1992) that unusual structure deformation can arise when the phenyl rings are twisted into positions described by high 0 values on ligation to a sterically demanding metal fragment such as Rh(r/-CsM%).…”