What question did this study set out to answer?

This research aims to characterize novel dinuclear carbonyl metalates featuring metal−metal double bonds.

January 14, 2026Zeitschrift für anorganische und allgemeine Chemie1 citationsOpen Access

Characterization of the Carbonyl Metalates Mn 2 (CO) 8 2− and W 2 (CO) 8 4− Featuring M = M Double Bonds

MWMichael WitzmannUniversity of Regensburg FWFranz WieberneitUniversity of Regensburg NKNikolaus KorberUniversity of Regensburg

Key Points

This research aims to characterize novel dinuclear carbonyl metalates featuring metal−metal double bonds.
Crystal structures of [Mn2(CO)8]2− and [W2(CO)8]4− were determined.
Quantum chemical calculations and QTAIM analysis were performed to study bonding characteristics.
Isostructural comparisons were made with elusive [Fe2(CO)8].
Evidenced the first homoleptic dinuclear carbonyl metalates with double metal−metal bonds.
Confirmed metallic bonding character within the carbonyl metalates.
Identified differences in terminal and bridging carbonyl ligands.

Abstract

The crystal structures of Rb[2.2.2crypt] 2 Mn 2 (CO) 8 ⋅ 4NH 3 and K[18crown‐6] 2 K 2 W 2 (CO) 8 ⋅ 14NH 3 are reported, containing the first homoleptic dinuclear carbonyl metalates featuring metal−metal double bonds. Mn 2 (CO) 8 2− and W 2 (CO) 8 4− are isostructural and isoelectronic to the elusive Fe 2 (CO) 8 . Quantum chemical calculations and QTAIM analysis confirm the metallic bonding character, as well as differences in terminal and bridging carbonyl ligands.

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