Untitled

Synthesis and structure of halogen derivatives of 9-dimethylsulfonium-7,8-dicarba-nido-undecaborane [9-Me2S-7,8-C2B9H11]

“…The halogen derivatives contained halogen atoms at the positions 5, 6 [19], 2, 4 [20], and 3 [21] in the ''lower'' belt of the 7,8-dicarba-nido-undecaborate cage can be obtained by indirect methods. The bromination and iodination at the ''lower'' belt of [9-Py-7,8-C 2 B 9 H 11 ] was reported earlier by Volkov et al [15], however, the proposed position of substitution was not supported by any reasonable arguments. Moreover, these results (at least in the iodination part) were disproved later by X-ray structure determination, which revealed the substitution at the position 11 of the ''upper'' belt [16].…”

“…An introduction of alkyl or aryl substituents at the carbon atoms of the carborane cage does not interfere with this pattern [11][12][13][14]. The halogenation of charge-compensated nido-carboranes is less studied [15], however the iodination of [9-Py-7,8-C 2 B 9 H 11 ] with elemental iodine has been reported recently to proceed at the position 11 giving [9-Py-11-I-7,8-C 2 B 9 H 10 ] [16]. Based on these data it could be expected that halogenation of [9-Me 2 S-7,8-C 2 B 9 H 11 ] will proceed in the similar way.…”

Boron clusters in luminescent materials

“…Later in 2000, Volkov et al further investigated the photophysical properties of a series of cluster borane derivatives, carboranes of the types B 10 H 12 [Py(X)] 2 , C 2 B 9 H 11 Py(X) and C 2 B 9 H 10 BrPy(X) and the salts of hydroborate anions [B 10 H 13 Py(X)] À , [B 10 H 10 ] 2À and [B 12 H 12 ] 2À with cations of quaternary pyridinium bases. 68 On the basis of the studies into the key photoluminescence properties of a series of forty two compounds, it was demonstrated that the luminescence features are rather inherent for boron hydrides. However, neutral boranes seldom show any detectable photoluminescence.…”

Geometric, Spectroscopic, and Magnetic Characteristics of [Tris(1,10-phenanthroline)manganese](2+) 1,2;1′,2′-trans-Bis[nonahydro-closo-decaborate](2−) Bis(dimethylformamide)

“…Previously [1] we revealed weak ferromagnetic interactions at 20 K in the complexes [MnPhen 3 ][Co(C 2 . B 9 H 11 ) 2 ] 2 and [MnPhen 3 ][C 2 B 9 H 12 ] 2 [Phen is phenanthroline, 1,10-C 12 H 8 N 2 ; C 2 B 9 H 12 is the dodecahydro-7,8-dicarba-nido-undecaborate (13) anion] containing the paramagnetic Mn(II) ion (3d 5 ), which is a new fact in the chemistry of boron hydrides. Here we report on a compound containing the 1,2;1`,2`-trans-bis-[nonahydro-closo-decaborate] (23) anion, [B 20 H 18 ] 2!…”

“…In particular, whereas the spectrum of the [B 10 H 10 ] 2! anion consists of two signals with the intensity ratio of 1 : 4 and 2523 cm !1 , respectively, which suggests a decrease in the electron density on the BH groups [13] and hence a decrease in their hydride character.…”