9(1) cm(-1). On redissolution of 1 in MeCN, the hydroxo bridge was deprotonated, and a green solution of the complex [(CH(3)CN)(5)CrOCr(NCCH(3))(5)](4+) formed. The electronic absorption spectrum of this solution is very similar to the spectrum of the classical complex [(H(3)N)(5)CrOCr(NH(3))(5)](4+) with intense bands in the UV and near-UV region. From the temperature dependence of the absorption spectrum
                                    [Cr(NCCH(3))(6)](2+)与双氧在
乙腈(MeCN)溶液中用HBF(4)酸化的反应,得到双核络合物[(CH(3)CN)(5)的红色晶体)Cr(OH)Cr(NCCH(3))(5)](BF(4))(5)(1)。从1的X射线晶体结构,发现Cr-O-Cr角为147.5(2)度。磁化率测量值1显示两个
铬(III)中心之间的反
铁磁耦合,三重态能量J = 35.9(1)cm(-1)。在MeCN中重新溶解1时,羟基桥被去质子化,形成复合物[(CH(3)CN)(5)CrOCr(NCCH(3))(5)](4+)的绿色溶液。该解决方案的电子吸收光谱与经典配合物[(H(3)N)(5)CrOCr(NH(3))(5)](4+)的光谱非常相似,在紫外和可见光谱中具有很强的能带。近紫外线区域。从12900 cm(-1)附近的吸收光谱的温度依赖性,发现三重态能量J为1067(19)cm(-1)。1中的羟基桥的酸度非常高,酸解离常数K(a)>>