New girdle-like Mo18 polyanions linked into chains.
From the reduction of heptamolybdate, a polyoxomolybdate was obtained with the formula [Na(6)(+)(H(2)O)(16)(NH(2)CH(2)COO)(2)(-)](4+).[Na(+)[H(9)Mo(10)(VI)Mo(8)(V)O(56)(NH(2)CH(2)COO)(2)(-)](5-)](4-).20H(2)O, i.e. heptasodium nonahydrogen tetracarbamate hexadecaaquahexapentacontaoxaoctadecamolybdate(V,VI) icosahydrate. The 18 Mo atoms are connected by bridging O atoms to form a centrosymmetric girdle-like structure, in which Mo(V)-Mo(V) units are found. An Na(+) cation occupies the central hole of the girdle, while four Na(+) cations are bonded to the O atoms on the girdle edge. The girdles are linked into a one-dimensional chain by the other Na(+) cations.
Liu
Guang
G
Institute of Physical Chemistry, Peking University, Beijing 100871, People's Republic of China.
Zhang
Shi-Wei
SW