Anionic cobalt-platinum-ethynyl (CoPt–C2H) metal-organic subnanoparticles: a DFT modeling study Mikail Aslan and Roy L. Johnston Eur. Phys. J. B, 91 6 (2018) 120 Published online: 18 June 2018 DOI: 10.1140/epjb/e2018-90004-2