Structure of the 7,7'-commo-bis[dodecahydro-7-nickela-nido-undecaborate] dianion

Boranes and heteroboranes: a paradigm for the electron requirements of clusters?

“…Relatively minor exceptions are found in (C5H5)2Fe2C2B6H864 and Ni(BioHi2)22-. 65 The former (2n electrons) is noticeably distorted from an idealized structure, and the latter is reminiscent of the d8 and d9 complexes discussed above. However, the extremely deficient count obtained for ((C2B9Hn)2Crin)presents a disconcerting situation in view of its clearly closo structural classification.…”

“…66 In some of these cases, it is more satisfying to consider the borane as a multidentate ligand, e.g., BioH422~i s effectively bidentate, giving square planar and tetrahedral complexes, Ni(BioHi2)22~a nd Zn(BioHi2)22~, respectively. 65 Both the latter and the former are cases where the metal in effect occupies the position of a bridge hydrogen of the conjugate acid borane, a rather prevalent occurrence which gives rise to another classification for metalloboranes and metalloheteroboranes. Weg-ner673 and Lippard67b have discussed in more detail situations where the metal vertex is equivalent to an H+, BH2+, or BH2+ moiety; however, in the latter formalism the arachno molecules (Ph3P)2CuB3H8 and [(OC)4-Cr(B3H8)]_ were incorrectly classified as nido.…”

Transition metal hydroborate complexes. VIII. Structure of .mu.-decahydrodecaboratotetrakis(triphenylphosphine)dicopper(I)-chloroform. Bonding annalogies between boron hydrides and nido-metalloboranes

“…Using graphite-monochromatized Cu Km ( 1.54041 Á) radiation, 21 reflections were centered, 12 of which were used to compute an orientation matrix and lattice parameters for data collection. The full set of 21 reflections was later refined by a least-squares method9 to yield the following unit cell constants: a = 21.189 (3) A ,b= 13.438 (2) A, c = 13.207 (2) A, a = 102.61…”

ortho-Cycloboronation of a Thiobenzoate Cluster: [(PPh3)(PhC\bridge{OS)$_{2}$NiB}{12.5mm}10H10].0.5C6H14

“…The Ni atom is bound to one PPh3 group, two S atoms and four B atoms. The Ni7--B2 and Ni7--B3 distances (Table 1) are shorter than the corresponding Ni--B distances in Ni(Bl0Hl2)22- (Guggenberger, 1972) The distances between the Ni and two S atoms (Table 1) are longer than the Ni--S bond lengths in compound (I) [Ni7--S1 2.2135(10) and Ni7--S2 2.2056 (10) A]. This may be interpreted by steric effects owing to two Ni---S--C---O---B rings being on the same side of the cage [S1--Ni7uS2 87.86(5)°].…”