title: Field-Induced Slow Magnetic Relaxation in the Ni(I) Complexes [NiCl(PPh3)2]·C4H8O and [Ni(N(SiMe3)2)(PPh3)2].
abstract: Direct current (dc) and alternating current (ac) magnetic measurements have been performed on the three Ni(I) complexes: [NiCl(PPh3)3], [NiCl(PPh3)2]·C4H8O, and [Ni(N(SiMe3)2)(PPh3)2]. Fits of the dc magnetic data suggest an almost similar behavior of the three compounds, which display only moderate deviations from the spin-only values. The ac magnetic investigations reveal that the two complexes with trigonal planar coordination--[NiCl(PPh3)2]·C4H8O and [Ni(N(SiMe3)2)(PPh3)2]--display slow magnetic relaxation at low temperatures under applied dc fields, whereas tetrahedral [NiCl(PPh3)3] does not. Ground and excited states as well as magnetic data were calculated by ab initio wave function based multi-configurational methods, including dynamic correlation as well as spin-orbit coupling. The two trigonal planar complexes comprise well-isolated S = (1)/2 ground states, whereas two S = (1)/2 states with a splitting of less than 100 cm(-1) were found in the tetrahedral compound.
authors.affiliation: Lehn Institute of Functional Materials, Sun Yat-Sen University , Guangzhou 510275, China.|Institut für Nanotechnologie, Karlsruher Institut für Technologie (KIT) , Campus Nord, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Weiquan
authors.initials: W
authors.lastname: Lin
authors.affiliation: Institut für Nanotechnologie, Karlsruher Institut für Technologie (KIT) , Campus Nord, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Tilmann
authors.initials: T
authors.lastname: Bodenstein
authors.affiliation: Institut für Anorganische Chemie, Karlsruher Institut für Technologie (KIT) , Campus Süd, Engesserstrasse 15, 76131 Karlsruhe, Germany.
authors.forename: Valeriu
authors.initials: V
authors.lastname: Mereacre
authors.affiliation: Institut für Nanotechnologie, Karlsruher Institut für Technologie (KIT) , Campus Nord, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Karin
authors.initials: K
authors.lastname: Fink
authors.affiliation: Lehn Institute of Functional Materials, Sun Yat-Sen University , Guangzhou 510275, China.|Institut für Nanotechnologie, Karlsruher Institut für Technologie (KIT) , Campus Nord, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.|Karlsruhe Nano Micro Facility (KNMF), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Eichhöfer