0000000000414929
AUTHOR
Esko Salojärvi
Series of Near-IR-Absorbing Transition Metal Complexes with Redox Active Ligands
New soluble and intensely near-IR-absorbing transition metal (Ti, Zr, V, Ni) complexes were synthesized using a redox non-innocent N,N&rsquo
A diamagnetic iron complex and its twisted sister – structural evidence on partial spin state change in a crystalline iron complex
We report here the syntheses of a diamagnetic Fe complex [Fe(HL)2] (1), prepared by reacting a redox non-innocent ligand precursor N,N′-bis(3,5-di-tert-butyl-2-hydroxy-phenyl)-1,2-phenylenediamine (H4L) with FeCl3, and its phenoxazine derivative [Fe(L′)2] (2), which was obtained via intra-ligand cyclisation of the parent complex. Magnetic measurements, accompanied by spectroscopic, structural and computational analyses show that 1 can be viewed as a rather unusual Fe(III) complex with a diamagnetic ground state in the studied temperature range due to a strong antiferromagnetic coupling between the low-spin Fe(III) ion and a radical ligand. For a paramagnetic high-spin Fe(II) complex 2 it wa…
Aminobisphenolate supported tungsten disulphido and dithiolene complexes
Dioxotungsten(vi) complexes with tetradentate amino bisphenolates were converted into the corresponding Cs-symmetric amino bisphenolate disulphido complexes by a reaction with either Lawesson's reagent or P2S5. Further reaction with diethyl acetylenedicarboxylate leads to the formation of diamagnetic tungsten(iv) dithiolene compounds. The syntheses, crystal structures, spectroscopic and electrochemical characterization of such disulphido and dithiolene complexes are presented.
NIR-absorbing transition metal complexes with redox-active ligands
Bench top stable transition metal (M = Co, Ni, Cu) complexes with a non-innocent ortho-aminophenol derivative were synthesized by the reaction of metal(II)acetates with a ligand precursor in 2:1 ratio. The solid-state structures reveal the formation of neutral molecular complexes with square planar coordination geometries. The Co(II) and Cu(II) complexes are paramagnetic, whereas the Ni complex is a diamagnetic square planar low-spin Ni(II) complex. All complexes, and Ni(II) complex in particular, show strong absorption in the near-IR region. Peer reviewed
CCDC 1913766: Experimental Crystal Structure Determination
Related Article: Esko Salojärvi, Anssi Peuronen, Hannu Huhtinen, Leonid S. Vlasenko, Janne Halme, Pyry Mäkinen, Mika Lastusaari, Ari Lehtonen|2020|Inorg.Chem.Commun.|112|107711|doi:10.1016/j.inoche.2019.107711
CCDC 1913765: Experimental Crystal Structure Determination
Related Article: Esko Salojärvi, Anssi Peuronen, Hannu Huhtinen, Leonid S. Vlasenko, Janne Halme, Pyry Mäkinen, Mika Lastusaari, Ari Lehtonen|2020|Inorg.Chem.Commun.|112|107711|doi:10.1016/j.inoche.2019.107711