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Quadruple bonding of bare group-13 atoms in transition metal complexes

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Abstract

Density functional theory calculations at the M06-D3/def2-TZVPPD level of the group-13 anion complexes EFe(CO)3 (E = B–Tl) and the isoelectronic neutral and charged boron adducts BTM(CO)3q (TMq = Fe, Ru, Os, Co, Rh, Ir, Ni+, Pd+, Pt+) give tetrahedral (C3v) geometries in the 1A1 electronic ground state as equilibrium structures. The analysis of the bonding situation with the energy decomposition analysis in combination with natural orbital for chemical valence method suggests that the E–TM(CO)3q bonds possess four bonding components: (a) one strong electron-sharing σ bond E–TM(CO)3q; (b) two π backdonations E⇇TM(CO)3q and (c) one weak σ donation E→TM(CO)3q. The relative strength of the four bonding components depends on the charge of the system, the transition metal TM and the group-13 atom E. The σ donation E→TM(CO)3q is in all systems rather weak while the associated charge migration is not negligible. A similar situation of the bonding of terminal group-13 atoms Ga and In is found in Ga–TM(GaCp)4+ and E–Pt(PMe3)3+ (TM = Ni, Pd, Pt; E = Ga, In), which are model compounds for the stable complexes GaTM(GaCp*)4+ (TM = Ni, Pt) and InPt(PPh3)3+. The quadruple bonds E→TML2 are hybrids of electron-sharing and dative bonds.

Graphical abstract: Quadruple bonding of bare group-13 atoms in transition metal complexes

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Article information


Submitted
08 Aug 2020
Accepted
24 Sep 2020
First published
25 Sep 2020

Dalton Trans., 2020, Advance Article
Article type
Paper

Quadruple bonding of bare group-13 atoms in transition metal complexes

S. Pan, S. Manoj and G. Frenking, Dalton Trans., 2020, Advance Article , DOI: 10.1039/D0DT02773A

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