Synthesis and characterization of the unusual cluster [Ni2(GaAr′)2(η1:η1-μ2-C2H4)]: Ready addition of ethylene to Ni(COD)(GaAr′)2 at 25 °C and 1 atmosphere

Hume–Rothery Phase-Inspired Metal-Rich Molecules: Cluster Expansion of [Ni(ZnMe)6(ZnCp*)2] by Face Capping with Ni0(η6-toluene) and NiI(η5-Cp*)

“…The structurally most interesting feature of 2 with respect to 1 is the toluene molecule coordinated to Ni2. The Ni–toluene centroid distance of 2 is 1.635 Å, which is rather similar to those other nickel(0) arene complexes found in the literature: [{(μ 2 -η 6 -IPr)Ni} 2 ] [IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene; Ni-[η 6 -C 6 H 3 ( i -Pr) 2 ] centroid = 1.607 Å], [C 3 H(CH 2 )(CH 3 )(C 6 H 3 -2,6- i -Pr 2 ) 2 )SiNi(η 6 -toluene)] [Ni–(η 6 -toluene) centroid = 1.592 Å], [(η 1 - t -Bu 2 PCH 2 P- t -Bu 2 )Ni(η 6 -benzene)] [Ni–(η 6 -benzene) centroid = 1.619 Å], [(R H 2 Si)Ni(η 6 -toluene)] [R H = 1,1,4,4-tetrakis(trimethylsilyl)butane-1,4-diyl; Ni–(η 6 -toluene) centroid = 1.618 Å], and [Ni 2 (GaAr′) 2 (η 1 :η 1 -μ 2 -C 2 H 4 )] [Ar′ = C 6 H 3 -2,6-(C 6 H 3 -2,6- i -Pr 2 ) 2 ; Ni–(η 6 -C 6 H 3 -2,6- i -Pr 2 ) centroid = 1.679 and 1.672 Å]. The Ni1–Zn and Zn–Zn distances in 2 are very similar to those of compound 1 , and likewise the trend for the Ni–Zn distances is Ni2–ZnMe bridging ≥ Ni1–ZnMe bridging > Ni1–ZnCp* > Ni1–ZnMe terminal .…”

“…Besides them, bis-arene structures like [Cr(η 6 -C 6 H 6 ) 2 ] and [U(η 8 -C 8 H 8 ) 2 ] , have been known for decades, but in contrast, zerovalent d 10 metal(η 6 -arene) complexes are still rare, which may arise from the electron-rich situation of the d 10 metal center, resulting in a low σ-donor/π-acceptor bonding efficiency and, thus, low thermal stability of these moieties. A few examples of such Ni(η 6 -arene) complexes that are stable enough to be characterized by single-crystal X-ray analysis have been reported: Mostly, strong σ donors are able to stabilize these highly reactive Ni 0 (η 6 -arene) complexes, including N-heterocyclic carbenes (NHCs), ylides like silylene and phosphine, and low-valent Ga I Ar′ [Ar′ = C 6 H 3 -2,6-(C 6 H 3 -2,6- i -Pr 2 ) 2 ] ligands. − …”

Metal–Metal (MM) Bond Distances and Bond Orders in Binuclear Metal Complexes of the First Row Transition Metals Titanium Through Zinc

“…Computational studies should be useful here. Complexes 02 (Figure a) to 06 (Figure b) have Ni(0)–Ni(0) bond lengths from 2.483 to 2.572 Å (Kubiak, , Fischer, and Seifert and Linti), while structure 07 has a shorter R MM value of 2.437 Å (Power).…”

Bonding and Reactivity of Gallium and Aluminium Coordination Complexes

“…This makes them effectively group 13 carbene analogues. Complex 1 will donate its lone electron pair into empty orbitals of Lewis acids (Figure 56), resulting in complexes of type XCVI where M = boron, [177][178] aluminium, 178 gallium, 178 phosphorus, [179][180] nickel, 14,[181][182][183] platinum, 184 palladium, 184 copper, 185 silver, 185 germanium, 186 chromium, 187 molybdenum, 187 tungsten, 187 and cobalt. 187 While complex 1 can act as an ancillary ligand, it also readily undergoes redox chemistry to form complexes of type XCVII, and has been shown to insert into Au-Cl, 180 Rh-Cl , 188 Zn-Cl, 189 Zn-Me, 189 Ga-Cl, 190 Ga-Me, 190 Sn-Cl, [190][191] Si-Cl, 190 C-Cl , 190 Bi-O, 192 Bi-C, 130 Bi-N, 193 H-H, 194 O-H, [194][195] P-H, 194 P-P, 196 P-Cl, 193 N-H, 194 Sn-H, 194 Pb-Cl, 197 Pb-O, 197 Hg-S,…”