An xhyphen;ray diffraction study of the crystal structure of Cu2B10H10shows that the earlier proposal that the B10H10mdash;2ion hasD4dsymmetry is correct, and further establishes the covalent nature of the interactions of CuIwith B atoms forming the edges of the polyhedron. There are eight Cu2B10H10in a unit cell having dimensionsa= 10.11,b= 11.36, andc= 14.50, and the space group isPcab.Bonds within a tetragonal pyramid are 1.73 Aring; (to apex) and 1.86 Aring; (along base), while Bsngbnd;B bonds between the tetragonal pyramids are 1.81 Aring; in length. The closest Cumiddot;middot;middot;B distances range from 2.14 to 2.33 Aring; in length.
展开▼
