Single-Molecule Magnets: Site-Specific Ligand Abstraction from [Mn<sub>12</sub>O<sub>12</sub>(O<sub>2</sub>CR)<sub>16</sub>(H<sub>2</sub>O)<sub>4</sub>] and the Preparation and Properties of [Mn<sub>12</sub>O<sub>12</sub>(NO<sub>3</sub>)<sub>4</sub>(O<sub>2</sub>CCH<sub>2</sub>Bu<i><sup>t</sup></i>)<sub>12</sub>(H<sub>2</sub>O)<sub>4</sub>]
作者:Pau Artus、Colette Boskovic、Jae Yoo、William E. Streib、Louis-Claude Brunel、David N. Hendrickson、George Christou
DOI:10.1021/ic010252g
日期:2001.8.1
complex 6 shows resonances assigned to transitions between zero-field split M(s) states of the S = 10 ground state. Fitting of the data gave S = 10, g = 1.99, D = -0.46 cm(-1), and B(4)(0) = -2.0 x 10(-5), where B(4)(0) is the quartic zero-field coefficient. The combined results demonstrate that replacement of four carboxylate groups with NO(3)(-) groups leads to insignificant perturbation of the magnetic
站点选择性的羧酸盐提取已通过在MeCN中用HNO(3)处理从[Mn(12)O(12)(O(2)CR)(16)(H(2)O)(4)]复合物实现。R = Ph或CH(2)Bu(t)()配合物与4当量的HNO(3)的反应得到[Mn(12)O(12)(NO(3))(4)(O(2 )CR)(12)(H(2)O)(4)](R = CH(2)Bu(t)(6)或Ph(7))的分析纯度。配合物6.MeNO(2)在单斜空间群C2 / c中以-168摄氏度的以下细胞参数结晶:a = 21.280(5),b = 34.430(8),c = 33.023(8)A,beta = 104.61(1)度,V = 23413 A,Z =8。这四个NO(3)(-)基团是无序的,它们以桥联模式结合在先前由桥联羧酸酯基占据的轴向位置。CD(2)Cl(2)和CDCl(3)中的(1)H NMR光谱显示在这些溶剂中溶解后固相结构得以保