Organotransition-metal metallacarboranes. 25. Redox chemistry and electronic studies of mono- and dinuclear iron(II)-iron(III) sandwich complexes

Transition Metal Metallacarbaboranes

“…The rich chemistry of indenylferracarbaboranes, referred to earlier in Section 9.2.2, is illustrative; another example is afforded by 1,2,3-Cp*Fe n H(Et2C 2 B 4 H 4 ) and its bimetallic counterpart l,2,3-[(C 5 Me4)Fe II H(Et 2 C 2 B 4 H 4 )] 2 C 6 H4, which undergo reversible redox processes to generate, in the former case, an Fe m species, and in the latter case, Fe M /Fe ni and Fe m /Fe ni systems ( Figure 9). 72 The crystal structure of [1,2,3-(C 5 Me 4 )Fe I I H(Et2C 2 B4H4)] 2 C 6 H4 ( Figure 10) established that the metal-bound protons are in fact capping FeB 2 faces, as had long been conjectured for similar H n MC 2 B 4 clusters. 13 Hydrocarbon-metal-carbaborane complexes of the types just discussed can be regarded as bridges between boron cluster and transition metal organometallic chemistry.…”

Structure and decomposition of [HFe(CO)4(B2H5)], a revised behavior of an old uncharacterized complex

“…In contrast the (m 3 -H)eB bond is purely covalent (V 2 r(r) < 0). Let us remember that the (m 3 -H) structure has been reported also in the [complex[61] where two boron atoms are bound to the iron centre. In this complex, the Fee(m 3 -H) bond length (1.63 A) is close to the analogous one in our D isomer (1.64 A and 1.65 A,…”

Metal-containing carboranes with antitumor activity

“…After storage in a solution of tetramethylethylene diamine (TMEDA) in THF in air (or in HCl-Et 2 O in air), compound 62 was virtually quantitatively trans formed into brown green paramagnetic compound 63 (Scheme 22). 51 The reaction of the Et 2 C 2 B 4 H 5 -anion (61) with iron chloride and the C 8 H 8 2-anion produced complex 66 in rather high yield. Refluxing of 66 with AlCl 3 in anhydrous benzene afforded complex 64.…”