Organoboron borate

To immobilize such anions as borate, organoboron polymers were reacted with aryllithium reagents.31,32 The reaction of alkylborane polymers with n-BuLi was examined first however, the ionic conductivity of the resulting material was very low. Moreover, complicated peaks were observed in the H-NMR spectrum. Conversely, selective lithium borate formation was observed in the nB-NMR spectrum when PhLi was employed (scheme 6). An ionic conductivity of 9.45 X 10 7Scm 1 was observed at 50°C. The observed ionic conductivity was relatively low because of the decreased number of carrier ions compared with dissolved salt systems. However, the lithium transference number of this polymer was markedly high (0.82 at 30°C). 

A variety of organoboron polymer electrolytes were successfully prepared by hydroboration polymerization or dehydrocoupling polymerization. Investigations of the ion conductive properties of these polymers are summarized in Table 7. From this systematic study using defined organoboron polymers, it was clearly demonstrated that incorporation of organoboron anion receptors or lithium borate structures are fruitful approaches to improve the lithium transference number of an ion conductive matrix. 

Atmospheric boron is in the form of particulates or aerosols of borides, boron oxide, borates, boranes, organoboron compounds, trihalide boron compounds, or borazines. The half-time persistence of airborne boron particles is short, usually on the order of days (USPHS 1991). 

Some of the most useful organoboron compounds are ethers of boric acid, trialkyl(aryl)borates. There are several techniques for producing these ethers ... 

The traditional synthesis of organoboron compounds from organic halides is based on the reaction of trialkyl borates with Grignard or lithium reagents. However, the cross-coupling reaction of diboron solves the difficulties associated with the use of Mg/Li compounds. The cross-coupling reaction of diborons... 

Figure 5., JB-NMR Spectra of Organoboron Polymers Prepared by Boration Polymerization.

Organometallic group 13 species investigated for non-linear optics are essentially limited to derivatives of the metalloid element, boron. A number of different organoboron systems have been used in NLO chromophores. We have described the use of 77-boratobenzene transition metal derivatives as acceptors in Section 12.04.1.2.2.(iii) and 12.04.1.2.2.(iv). In this section, we will discuss three-coordinate boranes, four-coordinate borates, and finally carboranes. 

Because of the great volume of literature on boron-oxygen coordination compounds, it has been necessary to be highly selective in the choice of material and to confine our attention predominantly to reviews. Of the metal borates only those existing in aqueous media will be briefly mentioned and of the complexes of organoboron oxygen compounds, known in a very large number, the most important types only will be included. 

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