title: Bond Dissociation Energies for Diatomic Molecules Containing 3d Transition Metals: Benchmark Scalar-Relativistic Coupled-Cluster Calculations for 20 Molecules.
abstract: Benchmark scalar-relativistic coupled-cluster calculations for dissociation energies of the 20 diatomic molecules containing 3d transition metals in the 3dMLBE20 database ( J. Chem. Theory Comput. 2015 , 11 , 2036 ) are reported. Electron correlation and basis set effects are systematically studied. The agreement between theory and experiment is in general satisfactory. For a subset of 16 molecules, the standard deviation between computational and experimental values is 9 kJ/mol with the maximum deviation being 15 kJ/mol. The discrepancies between theory and experiment remain substantial (more than 20 kJ/mol) for VH, CrH, CoH, and FeH. To explore the source of the latter discrepancies, the analysis used to determine the experimental dissociation energies for VH and CrH is revisited. It is shown that, if improved values are used for the heterolytic C-H dissociation energies of di- and trimethylamine involved in the experimental determination, the experimental values for the dissociation energies of VH and CrH are increased by 18 kJ/mol, such that D0(VH) = 223 ± 7 kJ/mol and D0(CrH) = 204 ± 7 kJ/mol (or De(VH) = 233 ± 7 kJ/mol and De(CrH) = 214 ± 7 kJ/mol). The new experimental values agree quite well with the calculated values, showing the consistency of the computation and the measured reaction thresholds.
authors.affiliation: Institute for Theoretical Chemistry, Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712, United States.|Department of Chemistry, The Johns Hopkins University , Baltimore, Maryland 21218, United States.
authors.forename: Lan
authors.identifier: http://orcid.org/0000-0003-1165-9559
authors.initials: L
authors.lastname: Cheng
authors.affiliation: Institut für Physikalische Chemie, Universität Mainz , D-55099 Mainz, Germany.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Gauss
authors.affiliation: Chemical Sciences and Engineering Division, Argonne National Laboratory , Argonne, Illinois 60439, United States.|Computation Institute, The University of Chicago , Chicago, Illinois 60637, United States.
authors.forename: Branko
authors.initials: B
authors.lastname: Ruscic
authors.affiliation: Department of Chemistry, University of Utah , 315 S. 1400 E. Room 2020, Salt Lake City, Utah 84112, United States.
authors.forename: Peter B
authors.identifier: http://orcid.org/0000-0003-2953-6039
authors.initials: PB
authors.lastname: Armentrout
authors.affiliation: Institute for Theoretical Chemistry, Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712, United States.
authors.forename: John F
authors.identifier: http://orcid.org/0000-0001-5435-6430
authors.initials: JF
authors.lastname: Stanton