R. Dellapergola et al., STRUCTURE AND ELECTROCHEMICAL-BEHAVIOR OF THE PARAMAGNETIC ANION [IR14(CO)27]-, POSSESSING A TRIGONAL BIPYRAMIDAL ARRANGEMENT OF METAL ATOMS, Angewandte Chemie, International Edition in English, 32(9), 1993, pp. 1347-1349
The structure hardly changes when the cluster [Ir14(CO)27]- (1) is red
uced to the dianion or oxidized to the neutral compound. The 14 Ir ato
ms form a trigonal bipyramid, which contains an Ir atom at the center
of every edge (see picture). The terminal CO ligands cover the metal f
ramework completely.