title: Bonding in cationic MCH2+ (M=K-La, Hf-Rn): a theoretical study on periodic trends.
abstract: DFT and CCSD(T) calculations have been performed to investigate the bonding situation of 54 cationic methylene complexes, MCH(2)(+) (M=K-La, Hf-Rn). A comparison of the computed results with experimentally and CBS-QB3-derived data demonstrates the reliability of B3LYP/def2-QZVP with regard to the bond dissociation energies. Further, the bonding character of the MCH(2)(+) complexes is revealed by geometrical and molecular-orbital (MO) analysis. The comparison of the periodic trends within the s-, p-, and d-block MCH(2)(+) carbenes shows a pattern different for main-group versus transition-metal complexes. By combining this work with the recently reported trends for the f-block lanthanide carbenes MCH(2)(+), a systematic and comprehensive overview can be obtained.
authors.affiliation: Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germany. Xinhao.Zhang@mail.chem.tu-berlin.de
authors.forename: Xinhao
authors.initials: X
authors.lastname: Zhang
authors.forename: Helmut
authors.initials: H
authors.lastname: Schwarz