摘要
测量了Sr和Ba高氯酸盐在乙腈和乙醇中0.5mol.L^(-1)溶液的^(35)Cl NMR峰宽Δv和粘度η。按核四极矩弛豫机理,结合文献中Mg和Ca盐的数据,一种溶剂中各盐的Δv/η之比当反映~935)Cl核处的电场梯度平方之比。按接触型离子对假设,^(35)Cl处电场梯度平方之比应等于(r_++r_-)^(-6)。测得各盐的Δv/η之比与计算的(r_++r_-)^(-6)吻合,论证了在乙腈与乙醇中为接触型离子对。同时文中报告了Δv/η和盐的摩尔电导随水或DMF加入的变化。
This research has recorded the linewidth of ^(35)Cl ofSr(ClO_4)_2 and Ba(ClO_4)_2 at 0.5 mol·L^(-1) in acetonitrile and etha-nol. In terms of nuclear quadrupole moment relaxation mecha-nism and together with the results for Mg(ClO_4)_2 and Ca(ClO_4)_2in literature contact type of ion pair for perchlorate salts ofalkali earth metals was argued. The linewidth of ^(35)Cl at fixedconcentration of Sr (ClO_4)_2 and Ba(ClO_4)_2 in acetonitrile or etha-nol as bulk solvent was measured as a function of [B]/[M^(2+)].where B represents H_2O or DMF. The trend of the plot and thereason for that were explained and the solvation numbers forSr^(2+) and Ba^(2+) were estimated. Mole conductivities of salts werealso measured and explained for supporting of contact ion pair.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1992年第6期772-777,共6页
Acta Physico-Chimica Sinica
基金
Project Supported by National Nature Science Fundation of China and Lab. of Magnetic Resonance and Atomic and Molecular Physics
关键词
离子对
NMR
溶液
离子
缔合
Relaxation rate
Electric field gradient
Ion pair
Ionic solvation
Perchlorate salts
