Yoshida Yukihiro, Muroi Koji, Otsuka Akihiro, Saito Gunzi, Takahashi Masahide, Yoko Toshinobu
Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.
Inorg Chem. 2004 Feb 23;43(4):1458-62. doi: 10.1021/ic035045q.
New 1-ethyl-3-methylimidazolium (EMI) salts [EMI][C(CN)3] and [EMI][Ag(CN)2] were prepared and characterized. The C(CN)3 salt has a melting point at -11 degrees C and shows a low viscosity (18 cP) and a high ionic conductivity (1.8 x 10(-2) S cm(-1)) at room temperature. This conductivity is less than that of [EMI][N(CN)2] salt (2.7 x 10(-2) S cm(-1)), possibly due to the larger molecular weight of the anion. The first EMI salt containing Ag(I) complexes [EMI][Ag(CN)2] has a higher melting point of 73 degrees C. In the crystal, the C-H...pi interionic interactions between cations construct zigzag chains in the cationic two-dimensional layer. Close Ag..Ag interionic contacts of 3.226(1) A were observed in the one-dimensional anionic chain, and the relatively high melting point among the EMI salts with a monoanion appears to be governed essentially by these direct Ag...Ag interactions.
制备并表征了新型1-乙基-3-甲基咪唑鎓（EMI）盐[EMI][C(CN)3]和[EMI][Ag(CN)2]。[C(CN)3]盐的熔点为-11℃，在室温下显示出低粘度（18厘泊）和高离子电导率（1.8×10⁻² S cm⁻¹）。该电导率低于[EMI][N(CN)2]盐（2.7×10⁻² S cm⁻¹），这可能是由于阴离子的分子量较大。首个含Ag(I)配合物的EMI盐[EMI][Ag(CN)2]的熔点较高，为73℃。在晶体中，阳离子之间的C-H...π离子间相互作用在阳离子二维层中构成锯齿链。在一维阴离子链中观察到3.226(1) Å的紧密Ag..Ag离子间接触，并且在具有单阴离子的EMI盐中相对较高的熔点似乎主要由这些直接的Ag...Ag相互作用决定。
