“…The structure, bonding and stability of chemically bound C n O n have been explored in a large number of publications (Frenking, 1990; Schröder et al, 1998, 1999; Talbi and Chandler, 2000; Sabzyan and Noorbala, 2003; Zhou et al, 2010; Bao et al, 2012; Guo et al, 2012; Hu et al, 2012; Dixon et al, 2015; Liu et al, 2015; Hansen et al, 2016). To our surprise, larger CO oligomers in poly-cyclic form with n = 8, 9, 10, 12 were reported early (in 1967 and 1984; Verter and Dominic, 1967; Nallaiah, 1984). Their easy accessibility is in accordance with their good thermodynamic stability with respect to nCO (Schröder et al, 1999), and these low-lying clusters surely cannot be used for HEDMs.…”