Clusters borane

B5H9 also acts as a weak Brpnsted acid and, from proton competition reactions with other boranes and borane anions, it has been established that acidity increases with increasing size of the borane cluster and that arachno-boranes are more acidic than nido-horancs ... 

B Km- At least five different stmcture types of interconnected borane clusters have been identified they have the following features ... 

Typical borane clusters incorporating As or Sb atoms are c/oso-l,2-BioHioCHAs and closo-... 

Correlations between B NMR chemical shifts and electronic structure in borane and metal-borane clusters 99CCC767. 

Carboranes, azaboranes, and borane clusters in constructing liquid crystal materials 99CCC895. 

Further studies by this group centered on comparisons of the overoxidation resistance limit (ORL) of polypyrrole materials doped with monoanionic borane clusters [B12H11NH3] or dianionic borane [B12H12]2 or carborane [Co(C2B9Hu)2]2-clusters. The monoanionic boron clusters were found to offer the highest stability to the PPy doped materials against overoxidation than any other charged dopant. They were also found to be far superior to the dianionic clusters in their ability to impart an ORL rise.140... 

Oxidative insertion of a metal into a borane cluster. 

This chapter concerns carboranes (carbaboranes), which are boron clusters with at least one carbon atom as part of the polyhedral cage. Published studies on carboranes before 1981 were reviewed in GOMC (1982) and between 1982 and 1992 in COMC (1995). The present review covers the period of 1992 to early 2005. Unlike in previous chapters, boron hydrides with organic substituents attached to a boron atom, organopolyboron hydrides, are not discussed in this chapter. Borane clusters containing at least one non-carbon atom as part of the cage framework are reviewed in Chapters 3.03, 3.04 and 3.05 of this volume. 

The concept of borane clusters acting as ligands through B-H-M bonds although this review cites much of the pre-1995 literature, it is still useful.13... 

As in the latter example, the same aminosilane employed for the synthesis of the disilaborane (Scheme 3.3-1) was used to incorporate a silicon vertex into a poly-borane cluster skeleton. However, attempts to use pentaborane(9) B5H9 for this method proved not to be successful. Instead, pentaborane(9) undergoes degradation and formation of the tetraborane derivative [B4H8SiMe(NMe2)2BH2] was observed [30],... 

Borane Clusters with Croup 15 and Croup 16 Heteroatoms Survey of Compounds and Structures... 

Little is known about cl-8 and cl-9 hetero-borane clusters. 

A large number of borane clusters of the hypho-type are known that contain bridging groups such as CH2, NH, S, etc. Formally, these groups could be considered to... 

Presented in part at the Ralph W. Rudolph Memorial Symposium at the ACS Meeting, Kansas City, on September 15th, 1982. For a summary of some of the numerous valuable contributions of the late R.W. Rudolph to Inorganic Chemistry cf. "Borane Clusters, Metal Clusters and Catalysis" in Parry, R.W. Kodama,... 

Many further examples could be added to those already cited to support the close relationship between carbonyl clusters and borane clusters, particularly for species based on an octahedron. These other clo80 octahedral clusters include anions such as Co0(CO)i6 (34), [Fe6(CO)ieC] - (35, 40), [Rhe(CO)i5l]- (6), [Nie(CO)i2] - (31), [Co4Ni2(CO)i4] (5), and [Rhi2(CO)8o], in which two Rhg octahedra are linked by a metal-metal bond and two bridging carbonyl groups (2). 

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