SEARCH Articles Figures Tables Approximate Molecular Orbital Theory for 4-Electron 3-Centre Bonding Units Block polymers hydrogen bonding units Branching 6-Electron 4-Centre Bonding Units Comments on 6-Electron 4-Centre Bonding Units Complexes with P Units Bonded to M Atoms Cyclic 6-Electron 4-Centre Bonding Units Delocalized Molecular Orbital Theory for 4-Electron 3-Centre Bonding Units Electron 5-Centre Bonding Units C3O2, Succinimide, and Pyrrole Hydrogen bonding unit cell Hydrogen bonding units, segmented Intra-unit bonding Other Through-Bond Coupling Units Peptide unit hydrogen bonds Peptide unit partial double bond character Quadruple hydrogen bonding units SEQUENCE-SPECIFIC HYDROGEN BONDED UNITS FOR DIRECTED ASSOCIATION, ASSEMBLY, AND LIGATION Silicon dioxide bonding unit Supramolecular unit bonding The Bonding Unit Through-bond coupling units Transition metal bonding units Unit 9 CHEMICAL BONDING