Mapping transition state structures for thiophosphinoyl group transfer between oxyanionic nucleophiles in water and aqueous ethanol solvents
作者:Georgina I. Kalu、Collins I. Ubochi、Ikenna Onyido
DOI:10.1039/d2nj02008d
日期:——
with the More O’Ferrall–Jencks reaction map reveals two contending factors: (i) increased nucleophile/leavinggroup basicity moves the concerted TS towards tighter structures via vector g, while (ii) lowered solvent polarity moves the TS towards dissociative structures via vector z. The inequality z > g in water-rich solvent mixtures leads to more dissociative structures, whilst a parity of these vectors
Mattes, R.; Ruehl, D., Zeitschrift fur Anorganische und Allgemeine Chemie
作者:Mattes, R.、Ruehl, D.
DOI:——
日期:——
Cook, Robert D.; Metni, Marlene, Canadian Journal of Chemistry, 1985, vol. 63, p. 3155 - 3159
作者:Cook, Robert D.、Metni, Marlene
DOI:——
日期:——
A Concerted Mechanism for the Transfer of the Thiophosphinoyl Group from Aryl Dimethylphosphinothioate Esters to Oxyanionic Nucleophiles in Aqueous Solution
作者:Ikenna Onyido、Krzysztof Swierczek、Jamie Purcell、Alvan C. Hengge
DOI:10.1021/ja0501565
日期:2005.6.1
pK(a) of the leaving group (4-nitrophenoxide, pK(a) 7.14) is indicative of a concerted mechanism. The much lower value of beta(nuc) for the more basicnucleophiles reveals the importance of a desolvation step prior to rate-limiting nucleophilic attack. The reactions of a series of substituted aryl dimethylphosphinothioate esters give the same value of beta(lg) with the nucleophiles HO(-) (beta= -0.54
(λex = 680 nm). The fluorescence enhancement of the probe is directly proportional to the F− concentration in the range of 10–300 µM with the detection limit of 4.28 µM. The probe has been successfully used to determine F− concentration in real water and toothpaste samples as well as image F− in living cells. The simplicity and quick response of this probe endow it with the ability of detecting F− rapidly
与以秒为氟离子(F响应时间(10秒)的第一超快荧光探针- )已经提出了通过缀dimethylthiophosphoryl基作为与半菁的近红外荧光基团的识别单元。响应机制是F -的dimethylthiophosphoryl组的裂解诱导,用荧光团的解放,沿其导致在730nm的明显提高的荧光强度(λ EX = 680纳米)。该探针的荧光增强是成正比的在F -浓度在10-300微米与4.28μM的检测极限的范围内。探头已被成功地用于确定˚F -浓度在实际水和牙膏样品以及图像F -在活细胞。简单性和该探针的快速响应与检测F中的能力赋予它-实际样品迅速英寸