Synthesis and anion binding properties of multi-phosphonium triarylboranes: selective sensing of cyanide ions in buffered water at pH 7 was written by Song, Ki Cheol;Lee, Kang Mun;Nghia, Nguyen Van;Sung, Woo Young;Do, Youngkyu;Lee, Min Hyung. And the article was included in Organometallics in 2013.Recommanded Product: 2,5-Dibromo-1,3-dimethylbenzene This article mentions the following:
A series of mono-, di-, and tris-phosphonium-substituted triarylboranes, [Mes2BArP]I ([2]I), [MesBArP2]I2 ([3]I2), and [BArP3]I3 ([4]I3) (ArP = 4-MePh2P+-2,6-Me2C6H2), were prepared from the corresponding neutral boranes 2a–4a. The crystal structure of [4]I3 determined by x-ray diffraction study reveals peripheral decoration of aryl groups with phosphonium moieties. The anion affinity of the cationic boranes for fluoride and cyanide ions was investigated by UV-vis absorption titrations in aqueous solution The triarylboranes, [2]I-[4]I3 bind both fluoride and cyanide ions in a DMSO/H2O (7:3 volume/volume) mixture with high binding constants (K). Comparison of the K values of triarylboranes for fluoride reveals that fluorophilicity increases with the increasing number of phosphonium moieties: [2]+ (K = 2.3 × 101 M-1) < [3]2+ (3.6 × 105 M-1) < [4]3+ (1.0 × 107 M-1). A similar trend is also observed in the cyanide binding, with K values that are greater by 2-4 orders of magnitude than those in the fluoride binding. These results indicate an apparent additive effect of multiple phosphonium substitutions on the Lewis acidity enhancement of triarylboranes. The triphosphonium borane [4]Cl3, a water-soluble form of [4]I3, was further utilized in evaluating the anion affinity in water. While [4]3+ is shown to hardly bind fluoride in buffered aqueous solutions at pH 7, it binds cyanide with a high binding constant (1.7 × 107 M-1). In the experiment, the researchers used many compounds, for example, 2,5-Dibromo-1,3-dimethylbenzene (cas: 100189-84-2Recommanded Product: 2,5-Dibromo-1,3-dimethylbenzene).
2,5-Dibromo-1,3-dimethylbenzene (cas: 100189-84-2) belongs to organobromine compounds. A variety of minor organobromine compounds are found in nature, but none are biosynthesized or required by mammals. Organobromine compounds have fallen under increased scrutiny for their environmental impact. Bromine-containing agents predominate because not only are they more efficient than similar chlorine-containing species, but also the high atomic weight of bromine ensures that it is present in a high mass fraction within most organobromine compounds.Recommanded Product: 2,5-Dibromo-1,3-dimethylbenzene
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary