Mn₂bis(pentalene): a mixed-spin bimetallic with two extremes of bonding within the same molecule

Abstract

Structural, magnetic and theoretical studies show that the bimetallic pentalene complex, Mn(2)(C(8)H(4)(1,4-Si(i)Pr(3)))(2), contains both high and low spin Mn(ii) in two very different sites.

Bonding in pentalene complexes and their recent applications

“…The bond order again decreases and Mn2Pn*2 has a bond order of one. However, Mn2Pn † 2 has a different structure, [63] in which one Mn is η 5 coordinated by both pentalenes, the other η 1 coordinated by both pentalenes (Fig. 13).…”

Bis(azulene) “submarine” metal dimer sandwich compounds (C10H8)2M2 (M = Ti, V, Cr, Mn, Fe, Co, Ni): Parallel and opposed orientations

“…4). [14] In addition Cloke and coworkers [15][16][17] have synthesized the related silylated bis(pen- 2 , have not been synthesized. However, they have been the subject of a recent theoretical study.…”

“…) . In addition Cloke and coworkers have synthesized the related silylated bis(pentalene)metal derivatives Mo 2 [C 8 H 4 (SiPr 3 ) 2 ] 2 , Cr 2 [C 8 H 4 (SiPr 3 ) 2 ] 2 , and Mn 2 [C 8 H 4 (SiPr 3 ) 2 ] 2 . Similar bis(heptalene)dimetal binuclear submarine sandwich compounds, (C 12 H 10 ) 2 M 2 , have not been synthesized.…”

Binuclear Pentalene Iron Carbonyl Complexes

“…[18] This has allowed the synthesis of stable hexameth-ylpentalene metal carbonyl complexes [4] including the metal carbonyl derivatives cis-(η 5 ,η 5 -C 8 Me 6 )Fe 2 (CO) 5 and cis-(η 5 ,η 5 -C 8 Me 6 )Co 2 (CO) 4 [4] as well as the bis(hexamethylpentalene)metal derivatives (C 8 Me 6 ) 2 M 2 (M = V, Cr, Mn, Co, Ni). [23] In addition Cloke and co-workers [24][25][26] Among the pentalene metal carbonyl derivatives, the pentalene iron carbonyls (Figure 1) have been studied in the greatest detail. Either dihydropentalene [1,2,4,27] or pentalene dimer [6] can be used as the source of the pentalene ligand in thermal reactions with Fe(CO) 5 .…”