title: OPN and SPN: small molecules with great potential.
authors.affiliation: Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany. hans-jorg.himmel@aci.uni-heidelberg.de
authors.forename: Hans-Jörg
authors.initials: HJ
authors.lastname: Himmel
authors.forename: Gerald
authors.initials: G
authors.lastname: Linti