Boron clusters: Do they receive the deserved interest?

Teixidor, Francesç; Viñas, Clara; Demonceau, Albert; Núñez, Rosario

doi:10.1351/pac200375091305

Cited by 121 publications

(41 citation statements)

References 20 publications

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“…As could be expected, borane cluster compounds found use in several special fields [2,3]. Apart from the already abandoned high-energy rocket fuel development [4] in the 1950s and 1960s, other more promising application have been designed ranging from Boron Neutron Capture Therapy (BNCT) [5][6][7][8], radionuclide extraction [9], high-temperature polymers, solid electrolytes, catalysts [10], etc. (for examples see review [3]).…”

Section: Introductionmentioning

confidence: 99%

Capillary electrophoresis of boron cluster compounds in aqueous and nonaqueous solvents

Valeri¹,

Kremser²,

Raggi³

et al. 2008

Electrophoresis

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The electrophoretic properties of boron cluster compounds were determined in water, methanol and ACN as solvents of the BGE and discussed based on the principles of ion migration. Two types of boron cluster compounds were investigated. One type consisted of derivatives of the nido-7,8-dicarbaundecaborate cluster, the other types are derivatized cobalt bis(dicarbollide) ions (COSANs) whose central cobalt atom is sandwiched by two 7,8-dicarbaundecaborate clusters. The BGE in all solvents was acetate/acetic acid buffer with pH 4.75 in water, 9.7 in methanol and 22.3 in ACN, respectively, at different ionic strength between 5 and 30 mM. The dependence of the mobility on ionic strength could not be explained by the theory of Debye, Hückel and Onsager, but good agreement was found upon considering an ion size parameter. Limiting mobilities were derived by curve fitting, and by the aid of the solvent viscosities the hydrodynamic radii of the analyte anions were calculated. They are between 0.25 and 0.48 nm, and were nearly independent of the solvent. Electrophoresis of the analytes in a BGE consisting of 6 mM perchloric acid in ACN allows the conclusion that the present boron cluster compounds behave as stronger acids than perchloric acid.

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Section: Introductionmentioning

confidence: 99%

Capillary electrophoresis of boron cluster compounds in aqueous and nonaqueous solvents

Valeri¹,

Kremser²,

Raggi³

et al. 2008

Electrophoresis

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“…Currently investigated prospects include those in which chirality is either important or decisive feature. Relevant examples are boron cluster compounds applied as homogeneous stereoselective catalysts or their constituents [4,9] and as building blocks increasing curing efficacy of carbon drugs up to three orders of magnitude [10]. Recently, it has been reported that some boron cluster anions are capable to cure HIV forms resistant to carbon compounds [11].…”

Section: Introductionmentioning

confidence: 99%

Chiral separability of hydrophobic boron cluster anions with native cyclodextrins in water–methanol background electrolytes

Horáková

Vespalec

2007

Electrophoresis

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Cluster anions of boron are built up on three-center two-electron bonds in contrast to naturally occurring compounds and their synthetic analogs. Methanol works as a solvent and as a competing agent, which advantageously adjusts reasonable strength of their interaction with native CDs in water-organic BGE. The highest methanol concentration preserving chiral discrimination of atropoisomers of individual anions is approximately 35, 55 and 75% v/v for alpha-, beta- and gamma-CD, respectively. alpha-CD separates anionic 7, 8-nido-dicarbaundecaborate clusters with small exo-skeletal substituents. beta-CD separates anions of all four tested structural types. The efficiency of separation of a compound with alpha- or beta-CD is always markedly lower than the separation efficiency at the absence of a CD in BGE. The efficiency of separation of a compound with beta-CD is always lower than the efficiency of separation of the compound with alpha-CD. gamma-CD was proved to be unsuitable as a chiral selector because in BGEs with gamma-CD, effective mobilities of analytes as well as their differences continuously decrease. The decrease was ascribed to the decomposition of the gamma-CD. The assessment of analytical prospect of alpha- and beta-CDs as chiral selectors for chiral separations of boron cluster anions requires knowledge of stability of individual CDs at the conditions of analyses and recognition of the chance to eliminate low separation efficiency.

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“…have received much current interest. On the other hand, o-carborane has been shown to be a good system to modulate the C-C distance [15,16]. Depending on the steric and electronic nature of the C-substituents, the carbon-carbon distances within the C 2 B 10 clusters can vary from 1.629(4)Å in closo-C 2 B 10 H 12 [17] to 2.156(4)Å in a sterically crowded ferrocenyl derivative reported recently [18].…”

Section: Introductionmentioning

confidence: 97%

Synthesis, Crystal Structure and Photoluminescence of 1,2-Bis(phenylselenyl)-1,2-dicarba-closo-dodecaborane(12)

Miao

Chen

et al. 2011

Zeitschrift Für Naturforschung B

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The reaction of dithio-o-carborane with diphenyldiselenide (PhSeSePh) affords the title compound, closo-1,2-(PhSe) 2 C 2 B 10 H 10 (1), which has been characterized by IR and NMR ( 1 H, 11 B) spectroscopy and by single-crystal X-ray diffraction. The phenylselenyl groups are bonded to the cage carbon atoms of the o-carborane cluster with a C cage -C cage distance of 1.751(6)Å and an Se-C cage -C cage -Se torsion angle of 10.1(3) • . Compound 1 displays a violet emission on excitation with UV light. For comparison the photoluminescence of the known analog closo-1,2-(PhS) 2 C 2 B 10 H 10 (2) was also studied.

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Boron clusters: Do they receive the deserved interest?

Cited by 121 publications

References 20 publications

Capillary electrophoresis of boron cluster compounds in aqueous and nonaqueous solvents

Capillary electrophoresis of boron cluster compounds in aqueous and nonaqueous solvents

Chiral separability of hydrophobic boron cluster anions with native cyclodextrins in water–methanol background electrolytes

Synthesis, Crystal Structure and Photoluminescence of 1,2-Bis(phenylselenyl)-1,2-dicarba-closo-dodecaborane(12)

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