Science. 1995 Mar 10;267(5203):1476-9. doi: 10.1126/science.267.5203.1476.
A simple preparation of Cd(17)S(4)(SCH(2)CH(2)OH)(26) clusters in aqueous solution leads to the formation of colorless blocky crystals. X-ray structure determinations revealed a superlattice framework built up of covalently linked clusters. This superlattice is best described as two enlarged and interlaced diamond or zinc blende lattices. Because both the superlattice and the clusters display the same structural features, the crystal structure resembles the self-similarities known from fractal geometry. The optical spectrum of the cluster solution displays a sharp transition around 290 nanometers with a large absorption coefficient ( approximately 84,000 per molar per centimeter).
在水溶液中，一种简单的 Cd(17)S(4)(SCH(2)CH(2)OH)(26) 簇的制备方法导致了无色块状晶体的形成。X 射线结构测定揭示了由共价连接的簇组成的超晶格框架。这个超晶格最好被描述为两个放大和交错的金刚石或闪锌矿晶格。由于超晶格和簇都显示出相同的结构特征，晶体结构类似于分形几何中已知的自相似性。簇溶液的光学光谱在 290 纳米左右显示出一个尖锐的跃迁，具有大的吸收系数（约每摩尔每厘米 84000）。
