Pyrroles and benzannulated forms

Charge-compensated nido-carborane derivatives in the synthesis of iron(ii) bis(dicarbollide) complexes

“…6 One or more carbon atoms in the cyclopentadienyl ligand may be replaced by boron, nitrogen or phosphorus atoms, as well as various combinations thereof. [7][8][9][10][11] A three-dimensional analogue of the planar cyclopentadienyl anion Cp − is the dicarbollide anion [1,2-C 2 B 9 H 11 ] 2− , which is formed upon the deboronation of ortho-carborane C 2 B 10 H 12 with strong nucleophiles followed by deprotonation of the resulting nido-carborane [7,8-C 2 B 9 H 12 ] − . 12,13 Replacement of one or two cyclopentadienyl ligands in ferrocene with dicarbollide ones leads to the corresponding ferracarboranes 3-Cp-3,1,2-FeC 2 B 9 H 11 and [3,3′-Fe(1,2-C 2 B 9 H 11 ) 2 ] − .…”

Pyrrolyl-Bridged Metallocene Complexes: From Synthesis, Electronic Structure, to Single-Molecule Magnetism

“…By contrast, the Lewis basicity of the nitrogen atom allows a σ-coordination mode via η 1 . The combination between the two coordination types (σ- and π- type) affords the ability for a wide range of binding modes to be accessed without structural alterations to the ligand …”