Rhenium is different: CO tetramerization induced by a divalent lanthanide complex in rhenium carbonyls

Abstract

The reduction of M2(CO)10 (M = Mn, Re) with different divalent lanthanide (Ln = Sm, Yb) compounds was investigated.

Cooperative strategies for CO homologation

“…The coupled CO units form a bis(alkylidene) ligand bound to the rhenium centre in 50 (Scheme 12). Interestingly, CO coupling is only observed in the case of samarocene and the rhenium carbonyl: variation of the CO source to [Mn 2 (CO) 10 ] or reductant to a bis(amidinate) supported lanthanide complex (Ln = Sm, Yb) yielded a suite of isocarbonyl bridged complexes but provided no evidence for carbon chain growth from CO. 38…”

3d–4f heterometallic complexes by the reduction of transition metal carbonyls with bulky LnII amidinates

“…Very recently, some of us have reported the reduction of [Re 2 (CO) 10 ] with [L 2 Sm II (thf) 2 ] (L = Cp* or DippForm) and, depending on the nature of the ligands around samarium, were able to isolate either a Fischer-type rhenacycle (A) or a novel [Re 2 (CO) 8 ] 2− dianion (B) in the coordination sphere of [L 2 Sm III ] + moieties (Scheme 1). 34 Inspired by the above results, we further explored the reactivity of group 8 and 9 metal carbonyls towards divalent lanthanide complexes supported by the bulky amidinate DippForm ligand and report herein the synthesis and characterisation of the resulting 3d-4f metal complexes obtained.…”

“…Selected bond distances (Å) and angles [°]: Sm-O1 2.422(2), Sm'-O2 2.488(3), Sm-O3 2.552(3), Sm-N1 2.431(3), Sm-N2 2.449(3), Sm-N3 2.409(3), Sm-N4 2.449(3), Co-C1 1.733(4), Co-C2 1.787(4), Co-C3 1.747(4), Co-C4 1.782(4), O2-C1 1.175(4), O3-C3 1.170(4), O4-C2 1.138(5), O5-C4 1.145(5), N1-C5 1.322(4), N2-C5 1.318(4), N3-C6 1.330(5), N4-C6 1.326(5); O2'-Sm-O3 67.27(8), N1-Sm-N2 55.35(9), N1-Sm-N4 143.10(10), C1-Co-C2 108.8(2), C1-Co-C3 116.1(2), C1-Co-C4 110.1(2), C3-Co-C2 109.7(2), C3-Co-C4 105.8(2), C4-Co-C2 105.8(2), N2-C5-N1 118.4(3), N4-C6-N3 120.3(3). Reactivity of [Re 2 (CO) 10 ] towards Sm(II) complexes bearing different ligands 34.…”

Europium (II) Sulfate EuSO4: Synthesis Methods, Crystal and Electronic Structure, Luminescence Properties

“…[1][2][3][4][5][6][7] The reduction of Eu 3 + !Eu 2 + ions is used in the technology of separation of rare-earth raw materials. [7][8][9][10][11][12][13][14] Often, Eu 2 + compounds possess very interesting luminescent, [15][16][17] catalytic [18,19] and magnetic properties. [20][21][22] In terms of its properties, the Eu 2 + ion is similar to analogous ions of alkaline earth metals [13] and, in particular, strontium because of almost identical ionic radii (r(Eu 2 + ) = 0.112 nm, r(Sr 2 + ) = 0.127 nm).…”