Identification of Ge═O Double Bonds in Planar MnGeO and MnGeO Clusters: Anion Photoelectron Spectroscopy and Calculations.

The structures, chemical bonding, and magnetic properties of MnGeO and MnGeO are investigated by photoelectron spectroscopy and calculations. The experimental vertical electron detachment energies of MnGeO and MnGeO are measured to be 2.06 ± 0.04 and 2.64 ± 0.04 eV, respectively. The structures of MnGeO and MnGeO can be viewed as evolved from quadrilateral MnGe or tetrahedral MnGe. It is found that both MnGeO and MnGeO have symmetric planar structures with an O atom attached to quadrilateral MnGe. The structure of MnGeO is nonplanar with an O atom and an additional Ge atom attached to tetrahedral MnGe, while that of MnGeO is planar with an O atom and an additional Ge atom attached to quadrilateral MnGe. Chemical bonding analyses reveal the existence of Ge═O double bonds in MnGeO and MnGeO. Magnetic property analyses suggest that MnGeO and MnGeO are ferromagnetic with total spin magnetic moments of 5 μ.