<sup>77</sup>Se NMR Spectroscopic, DFT MO, and VBT Investigations of the Reversible Dissociation of Solid (Se<sub>6</sub>I<sub>2</sub>)[AsF<sub>6</sub>]<sub>2</sub>·2SO<sub>2</sub>in Liquid SO<sub>2</sub>to Solutions Containing 1,4-Se<sub>6</sub>I<sub>2</sub><sup>2+</sup>in Equilibrium with Se<sub><i>n</i></sub><sup>2+</sup>(<i>n</i>= 4, 8, 10) and Seven Binary Selenium Iodine Cations: Preliminary Evidence for 1,1,4,4-Se<sub>4</sub>Br<sub>4</sub><sup>2+</sup>and<i>cyclo</i>-Se<sub>7</sub>Br<sup>+</sup>
作者:Scott Brownridge、Larry Calhoun、H. Donald B. Jenkins、Risto S. Laitinen、Michael P. Murchie、Jack Passmore、Jarkko Pietikäinen、J.Mikko Rautiainen、Jeremy C.P. Sanders、Gary J. Schrobilgen、Reijo J. Suontamo、Heikki M. Tuononen、Jussi U. Valkonen、Chi- Ming Wong
DOI:10.1021/ic8015673
日期:2009.3.2
The composition of a complex equilibrium mixture formed upon dissolution of (Se6I2)[AsF6]2·2SO2 in SO2(l) was studied by 77Se NMR spectroscopy at −70 °C with both natural-abundance and enriched 77Se-isotope samples (enrichment 92%). Both the natural-abundance and enriched NMR spectra showed the presence of previously known cations 1,4-Se6I22+, SeI3+, 1,1,4,4-Se4I42+, Se102+, Se82+, and Se42+. The structure
通过-70°C的自然和丰度富集的77 Se NMR光谱研究了(Se 6 I 2)[AsF 6 ] 2 ·2SO 2在SO 2(l)中溶解后形成的复杂平衡混合物的组成。77个硒同位素样品(富集92%)。天然丰度和富集NMR光谱均显示存在先前已知的阳离子1,4-Se 6 I 2 2 +,SeI 3 +,1,1,4,4-Se 4 I 4 2 +,Se 10 2+,Se 8 2+和Se4 2+。使用DFT计算研究了1,4-Se 6 I 2 2+和1,1,4,4-Se 4 I 4 2+中的结构和键合。结果表明,观察到的Se-Se键交替以及热力学稳定的4pπ-4pπSe-Se和4pπ-5pπSe-I键的存在是由于正电荷带正电的三坐标Se +引起的正电荷离域。在77使用相对论零阶正则逼近(ZORA)计算阳离子的Se化学位移。另外,进行了添加少量显式溶剂分子的计算和隐式导体样筛选模型,以包括溶剂对化学位移