Superconducting alkali metal fullerides: development of a versatile solution-phase route from soluble M3C60 precursors
Superconducting alkali metal fullerides: development of a versatile solution-phase route from soluble M3C60 precursors
复制标题
超导碱金属富勒烯化合物：从可溶性 M3C60 前驱体开发多功能溶液相路线
DOI：
--
复制
发表时间：
1994
期刊：
影响因子：
--
通讯作者：
W. Broderick
中科院分区：
文献类型：
--
作者：
Xiaohua Liu;W. Wan;S. Owens;W. Broderick
我们在这里报告了一种简单而通用的超导M[sub 3]C[sub 60]材料的溶液相合成，通过可溶性碱金属-富勒化物前体，绕过了化学计量控制的常见问题。我们的方法是利用强还原18电子十甲基锰二世阴离子[Mn(cp*)[sub 2]][sup -] （cp*=五甲基环戊二烯）的碱金属盐，以高收率制备离散四氢呋喃溶剂化的C[sub 60]三阴离子M[sub 3]C[sub 60][中心点]xTHF。可溶的M[sub - 3]C[sub - 60]前驱体M[sub - 3]C[sub - 60][中心点]xTHF在非常温和的条件下（100[度]C）退火，可转化为具有大屏蔽分数的超导M[sub - 3]C[sub - 60]相。此外，这些前驱体在M[sub - 3]C[sub - 60]材料的制备和沉积方面提供了比传统的蒸气传输方法更大的通用性，并且应该允许制备高结晶M[sub - 3]C[sub - 60]以及薄膜。15个参考文献。， 2个无花果。
We report here a simple and versatile solution-phase synthesis of superconducting M[sub 3]C[sub 60] materials via soluble alkali metal-fulleride precursors that circumvents the usual problems of stoichiometric control. Our method involves the use of alkali metal salts of the strongly reducing 18-electron decamethylmanganocene anion, [Mn(cp*)[sub 2]][sup -] (cp*=pentamethylcyclopentadienide), to produce discrete THF-solvated alkali metal salts of the C[sub 60] trianon, M[sub 3]C[sub 60][center dot]xTHF, in high yield. The soluble M[sub 3]C[sub 60] precursors, M[sub 3]C[sub 60][center dot]xTHF, can be converted to the superconducting M[sub 3]C[sub 60] phase with large shielding fractions by annealing under very mild conditions (100 [degree]C). In addition, these precursors provide greater versatility in the preparation and deposition of M[sub 3]C[sub 60] materials than the conventional vapor transport method and should allow the preparation of highly crystalline M[sub 3]C[sub 60], as well as thin films. 15 refs., 2 figs.