Synthesis, structure, and electrochemical behavior of a new dinuclear Rh(III) complex bridged by a bpp− ligand (bpp−= 3,5-bis(2-pyridyl)pyrazolate)

Twinned versus linked organometallics - bimetallic “half-baguette” pentalenide complexes of Rh(i)

“…The majority of known bimetallic Rh(I) complexes consist of a ligand with two distinct binding sites connected by a linker moiety, where the size and nature of the linker determines the proximity and the extent of electronic communication between the two Rh(I) centres. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] With a view on cooperative effects it is thus useful to distinguish between linked bimetallics (two monometallic complexes tethered together) and twinned bimetallics where the two metals are held closely enough for direct metal-metal interactions to exist. 20,21 This distinction is not purely a function of atomic distances but depends on orbital overlap and is thus a sliding scale akin to the Robin-Day classification, 22,23 where the extremes of a truly twinned bimetallic would be class III and a distantly linked bimetallic class I.…”