Mononuclear rhenium ([CpRe(CO)2](alkane)) binding energies and binuclear rhenium [[(CO)2Re(C5H4)CC(C5H4)Re(CO)2](alkane)] binding energies, all calculated at the BP86/6–31G*, LANL2DZ level of theory. C1, C2, C3, C4, C5, C6, and C7 represent methane, ethane, n-propane, n-butane, n-pentane, n-hexane, and n-heptane, respectively. cycloC3, cycloC4, cycloC5, and cycloC6 represent cyclopropane, cyclobutane, cyclopentane, and cyclohexane, respectively.