Sekar Perumal, Ibers James A
Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA.
Inorg Chem. 2004 Aug 23;43(17):5436-41. doi: 10.1021/ic040026h.
Several mixed Te/Se polychalcogenide anions Te(m)Se(n) were synthesized at 293 K by reactions between Te(n)(2-)and Se(n)(2-) anions in N,N-dimethylformamide (DMF) in the presence of different-size ammonium or phosphonium cations, in some cases in the presence of metal species. The structures of these anions were determined by single-crystal X-ray diffraction methods. The crystal structures of NEt(4)[Te(3)Se(6)] (1) and NEt(4)[Te(3)Se(7)] (2) consist, respectively, of one-dimensional infinite 1(infinity)[Te(3)Se(6)(2-)] and 1(infinity)[Te(3)Se(7)(2-)] anionic chains separated by NEt(4)(+) cations. In compound 1, each chain comprises Te(3)Se(5) eight-membered rings bridged by Se atoms. The Te(3)Se(5) ring has an "open book" conformation. The NMR spectrum of a DMF solution of NEt(4)[Te(3)Se(6)] crystals at 223 K shows (77)Se resonances at delta = 290, 349, and 771 ppm and a single (125)Te resonance at delta = 944.7 ppm. In compound 2, each chain comprises Te(3)Se(6) five- and six-membered rings bridged by Se atoms. The Te(3)Se(6) ring can be regarded as an inorganic analogue of bicyclononane. The anion of PPh(4)[Te(2)Se(2)] (4) contains a Se-Te-Te-Se chain with the terminal Se atoms trans to one another. The new compounds PPN[TeSe(10)] (3), NMe(4)[TeSe(3)].DMF (5), and NEt(4)[TeSe(3)] (6) contain known anions.
在293K下,通过碲(n)(2-)和硒(n)(2-)阴离子在N,N-二甲基甲酰胺(DMF)中,在不同尺寸的铵或鏻阳离子存在下,有时在金属物种存在下反应,合成了几种混合的碲/硒多硫属化物阴离子Te(m)Se(n)。通过单晶X射线衍射方法确定了这些阴离子的结构。NEt(4)[Te(3)Se(6)](1)和NEt(4)[Te(3)Se(7)](2)的晶体结构分别由一维无限的1(∞)[Te(3)Se(6)(2-)]和1(∞)[Te(3)Se(7)(2-)]阴离子链组成,这些链被NEt(4)(+)阳离子隔开。在化合物1中,每条链包含由硒原子桥连的Te(3)Se(5)八元环。Te(3)Se(5)环具有“打开的书”构象。NEt(4)[Te(3)Se(6)]晶体的DMF溶液在223K下的NMR光谱显示在δ = 290、349和771ppm处有(77)Se共振,在δ = 944.7ppm处有单一的(125)Te共振。在化合物2中,每条链包含由硒原子桥连的Te(3)Se(6)五元环和六元环。Te(3)Se(6)环可被视为双环壬烷的无机类似物。PPh(4)[Te(2)Se(2)](4)的阴离子包含一个Se-Te-Te-Se链,末端的硒原子彼此反式排列。新化合物PPN[TeSe(10)](3)、NMe(4)[TeSe(3)].DMF(5)和NEt(4)[TeSe(3)](6)包含已知的阴离子。