The magneticproperties of layered double hydroxides (LDH) containing transition metal ions can still develop, compared with layered metal hydroxide salts which exhibit structure-dependent magnetism. In this article, we report the preparation of a hybrid magnet composed of Co–Ni LDH and n-alkylsulfonate anions (Co–Ni–CnSO3 LDH). As Co–Ni LDH is anion-exchangeable, we can systematically control the
与表现出依赖于结构的磁性的层状金属氢氧化物盐相比,包含过渡金属离子的层状双氢氧化物(LDH)的磁性仍然可以发展。在本文中,我们报告了由Co-Ni LDH和正烷基磺酸根阴离子(Co-Ni-C n SO 3 LDH)组成的混合磁体的制备。由于Co-Ni LDH是阴离子可交换的,因此我们可以通过嵌入n来系统地控制层间距-具有不同碳数的-烷基磺酸盐。用与温度和场有关的磁化强度测量来检验磁性能。结果,我们发现矫顽场取决于基础间距。建议增加基础间距会改变平面内超交换相互作用与远程平面外偶极相互作用之间的竞争。此外,矫顽场在基距20Å附近的跃迁被认为是Co-Ni-C n SO 3 LDH中磁有序的修正。
Process for preparing benzoic acid derivative intermediates and
申请人:Eli Lilly and Company
公开号:US05631369A1
公开(公告)日:1997-05-20
Novel processes for producing compounds of formula I ##STR1## wherein R.sup.1 and R.sup.2 each are independently C.sub.1 -C.sub.4 alkyl, or combine to form piperidinyl, pyrrolidinyl, methylpyrrolidinyl, dimethylpyrrolidinyl, morpholino, dimethylamino, diethylamino, or 1-hexamethyleneimino; and n is 2 or 3; or a pharmaceutically acceptable salt thereof employing alkylacetate solvents are provided.
Micellar effects on the reaction of (arylsulfonyl)alkyl arenesulfonates with hydroxide ion. 2. The absence of substrate orientational effects in a series of sulfonates of different hydrophobicities