Quintuple bond A quintuple bond in chemistry is an unusual type of chemical bond first observed in 2005 in a chromium dimer in an organometallic compound. Single bonds, double bonds and triple bonds are commonplace in chemistry. Quadruple bonds are rare but can be found in some Quintuple bonding. Article By: Kempe, Rhett Department of Inorganic Chemistry II, Universität Bayreuth, Bayreuth, Germany. Bond orders, formally the number of electron pairs that contribute positively to a chemical bond between atoms, matter fundamentally. This becomes obvious by considering the simple hydrocarbons ethane, ethylene, and acetylene, which have a bond order of one, two, and three, respectively. All three consist of two carbon atoms linked via a single, double, or triple bond. A quintuple bond in chemistry is an unusual type of chemical bond, first reported in 2005 for a dichromium compound. Single bonds, double bonds, and triple bonds are commonplace in chemistry. Quadruple bonds are rarer but are currently known only among the transition metals, especially for Cr, Mo, W, and Re, e.g. [Mo2Cl8]4− and [Re2Cl8]2−. In a quintuple bond, ten electrons participate in bonding between the two metal centers, allocated as σ2Ï4δ4. A quintuple bond in chemistry is an unusual type of chemical bond, first reported in 2005 for a dichromium compound. Single bonds, double bonds, and triple bonds are commonplace in chemistry. Quadruple bonds are rarer but are currently known only among the transition metals, especially for Cr, Mo, W, and Re, e.g. [Mo2Cl8]4− and [Re2Cl8]2−. In a quintuple bond, ten electrons participate in bonding between the two metal centers, allocated as σ2Ï4δ4. Quintuple Bonding in All These Geometries? The answer, briefly, is âœyes, we think so.â The chemical bond is a complex thing. Can we reason that RWWR has a quintuple bond from the absolute values of the WW overlap populations (1.37 and 1.11 for the linear and trans-bent, respectively)? Not directly. Quintuple bond, showing ELF isosurface. Click for 3D. It seems that AIM (the topology of the electron density) and ELF (the topology of the electron localization function) are giving us quite different pictures of the quintuple bond. Nonetheless, the quintuple bond clearly has some surprises for us, and it would itself be no surprise to find out that controversy about the meaning of such a bond continues apace. Share this: Skype..