Dresden 2003 – scientific programme
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MA: Magnetismus
MA 14: Poster: Schichten(1-31), Spinabh.Trsp.(32-47), Exch.Bias(48-54), Spindyn.(55-64), Mikromag.(65-76), Partikel(77-88), Oflmag.(89-92), Spinelektr.(93-98), Elektr.Theo.(99-103), Mikromag+PhasÜ+Aniso.(104-122), MagnMat.(123-134), Messm+Mol-Mag.(135-139), Kondo(140-151)
MA 14.128: Poster
Tuesday, March 25, 2003, 15:15–19:15, Zelt
Frequency-Domain Magnetic Spectroscopy on Metal Complexes (V15 and Ni(PPh3)2Cl2) — •Suriyakan Vongtragool1, Boris Gorshunov1, Joris van Slageren1, Martin Dressel1, Jurek Kryzstek2, Joshua Telsor3, and Achim Müller4 — 11.Physikalisches Institut, Universität stuttgart, D-70550 Stuttgart. — 2National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida. — 3Chemistry Program, Roosevelt University, Chicago, Illinois. — 4Anorganische Chemie I, Universität Bielefeld, D-33501 Bielefeld.
We introduce a frequency-domain magnetic spectroscopy (frequencies 3-40 cm −1, external magnetic fields up to 8 Tesla) to investigate the polyoxovanadate V15, which is an exchange coupled complex with an S=1/2 spin state, and an integer spin state, non-Kramers mononuclear complex, Ni(PPh3)2Cl2. Our method is complementary to regular high frequency EPR techniques and employs sweeping of the frequency with the fixed (including zero) external magnetic field. It allows us to observe electronic spin transitions directly for these complexes and to determine the spin Hamiltonian parameters (zero-field splittings and g values). Investigation of the lineshapes of the magnetic transitions gives additional information on the environment of the complexes. Here we report the g value anisotropy of the V15 complex and the zero-field splitting in Ni(PPh3)2Cl2.