Transition-metal Complexes with Triple Bonds to Si, Ge, Sn, and Pb and Relevant Complexes

Abstract

Koichi Nagata received his Ph.D. from Kyoto University (Japan) in 2016 under the guidance of supervisor Prof. Norihiro Tokitoh (Main group chemistry). After obtaining his Ph.D. degree, he then undertook postdoctoral studies with Prof. Jonas C. Peters (Inorganic chemistry) at Caltech as a JSPS Overseas Research Fellow. He then joined the Shionoya group (The University of Tokyo) as a postdoctoral fellow in September of 2017. He was promoted to a project assistant professor in April of 2018, working with Prof. Mitsuhiko Shionoya (Coordination chemistry, Supramolecular chemistry). In 2020, he joined the Hashimoto group as an Assistant Professor.

Cationic Tetrylene-Iron(0) Complexes: Access Points for Cooperative, Reversible Dihydrogen Activation and Open-Shell Iron(-I) Ferrato-Tetrylenes

“…Thermal ellipsoids at 25% probability, and hydrogen atoms omitted for clarity. Selected bond distance (Å) and angles (°) for 3: Ge1-Fe1 2.1978(6); Ge1-C32 2.049(2); Ge1-N1 1.845(2); P1-Fe1 2.2109(9); N1-Ge1-Fe1 137.75(6); N1-Ge1-C32 119.77 (7); Fe1-Ge1-C32 102.28(6); Ge1-Fe1-P1 94.17 (3). For 4: Sn1-Fe1 2.717(1); P1-Sn1 2.998(2); Fe1-C32 2.073(5); Sn1-N1 2-140(3); C1-N1 1.396 (7).…”

“…Selected bond distance (Å) and angles (°) for 3: Ge1-Fe1 2.1978(6); Ge1-C32 2.049(2); Ge1-N1 1.845(2); P1-Fe1 2.2109(9); N1-Ge1-Fe1 137.75(6); N1-Ge1-C32 119.77 (7); Fe1-Ge1-C32 102.28(6); Ge1-Fe1-P1 94.17 (3). For 4: Sn1-Fe1 2.717(1); P1-Sn1 2.998(2); Fe1-C32 2.073(5); Sn1-N1 2-140(3); C1-N1 1.396 (7). Two-coordinate-tetrylene complexes of first-row transition metals are, as mentioned, very rare indeed.…”

“…5 The past two decades have seen prolific research regarding the electronic nature of low-valent group 14 species, 6 and their bonding interactions with transition metals. 5,7 Due to the greater stability of lower oxidation states, and the decrease in electronegativity on descending group 14, their chemistry also deviates from that for carbon. Notably, the heavier tetrylenes have an amplified ambiphilicity, and are more Lewis acidic due to a lessened electronegativity.…”

Cooperativity in Transition Metal Tetrylene Complexes

“…Specifically, this complex was a base‐free metallogermylene with a single bond between Fe and Ge [27] . This type of compound also serves as an entry to tetrylynes, [28] whose reactivity is out of the scope of the present contribution [29] …”

“… [27] This type of compound also serves as an entry to tetrylynes, [28] whose reactivity is out of the scope of the present contribution. [29] …”