Bis(toluene)chromium(I) [1,2,5]Thiadiazolo[3,4-<i>c</i>][1,2,5]thiadiazolidyl and [1,2,5]Thiadiazolo[3,4-<i>b</i>]pyrazinidyl: New Heterospin (<i>S</i><sub>1</sub> = <i>S</i><sub>2</sub> = <sup>1</sup>/<sub>2</sub>) Radical-Ion Salts
作者:Nikolay A. Semenov、Nikolay A. Pushkarevsky、Elizaveta A. Suturina、Elena A. Chulanova、Natalia V. Kuratieva、Artem S. Bogomyakov、Irina G. Irtegova、Nadezhda V. Vasilieva、Lidia S. Konstantinova、Nina P. Gritsan、Oleg A. Rakitin、Victor I. Ovcharenko、Sergey N. Konchenko、Andrey V. Zibarev
DOI:10.1021/ic400659q
日期:2013.6.3
Hamiltonian for the clusters of 12 paramagnetic species with periodic boundary conditions. According to the calculations and χT temperature dependence simulation, a simplified magnetic model can be suggested for the salt 4 with AF interactions between the anions ([1]−···[1]−, J1 = −5.77 cm–1) and anions and cations ([1]−···[3]+, J2 = −0.84 cm–1). The magnetic structure of the salt 5 is much more complex
双(甲苯)铬(0),铬0(η 6 -C 7 ħ 8)2(3),容易被还原[1,2,5]噻二唑并[3,4- c ^ ] [1,2,5]噻二唑(1)和[1,2,5]噻二唑并[3,4- b ]吡嗪(2在与heterospin的形成的四氢呋喃溶剂),š 1 = s ^ 2 = 1 / 2,自由基离子盐[ 3 ] + [ 1 ] -(4)和[ 3 ] + [2 ] -(5)高产率分离。盐4和5的特征在于单晶X射线衍射(XRD),溶液和固态电子顺磁共振以及在2–300 K的温度范围内的磁化率测量。晶体结构非常不同,与4相比,在5中阴离子杂乱无章。对于盐的XRD结构,使用CASSCF / NEVPT2和破碎对称密度泛函理论方法计算了Heisenberg自旋哈密顿量的参数,并揭示了以反铁磁(AF)相互作用为主的复杂磁基元。实验χ Ť盐的温度依赖性使用范Vleck式和海森堡自旋哈密顿的用于治疗与周期性边界条