A variable-temperature Faraday magnetic balance

Abstract

Describes the design and experimental use of a variable-temperature Faraday magnetic balance.

Deprotonation-Induced Enantioselective Aggregation and Deprotonation-Induced Ligand Rearrangement of Copper(II) Complexes Yield 1D Homochiral and Heterochiral Chains and a Cyclic Tetramer, Respectively

“…The Cu-N bond distances are in the 1.89(2)-2. 19(1) Å range, Cu-N(1) being the longer one. Considering that the acyclic pentadentate ligand coordinated to the copper(II) ion is spirally arranged around the N(3)-Cu-N(5) axis, the complex cations are either ∆ or Λ enantiomorphs.…”

“…The calibrations were made with palladium and [Ni(en)3]S2O3 (en ) ethylenediamine). 19 Corrections for diamagnetism were applied by using Pascal's constants. 20 Effective magnetic moments were calculated with the equation µeff ) 2.828(χAT) 1/2 , where χA is the magnetic susceptibility per mole of copper ions.…”

Migratory Transmetalation in Diphenoxo-Bridged CuIIMII Complexes of a Dinucleating Macrocycle with N(amine)2O2 and N(imine)2O2 Metal-Binding Sites

“…Magnetic susceptibilities of powdered samples were measured on a Hoxan HSM-D SQUID susceptometer in the temperature range 4.2−80 K (applied magnetic field of 100 G) and a Faraday balance in the range 80−290 K (applied field of 3000 G). Calibrations were made with Mn(NH 4 ) 2 (SO 4 ) 2 ·6H 2 O for the SQUID susceptometer and with [Ni(en) 3 ]S 2 O 3 (en = ethylenediamine) for the Faraday balance. Diamagnetic corrections for the constituting atoms were made by the use of Pascal's constants…”

(Nitrosonaphtholato)metal complex-catalyzed oxidation of phenols and alkenes

“…On the other hand, the phenoxyl radical C should react with 1 to give D which isomerizes to E. The radical E should take part in a similar oxidation cycle, and diphenyldiol 3 would be formed. The diphenyldiol 3 is oxidized by the same catalytic cycle in dichloromethane, acetonitrile, THF and methanol to yield F, which is transformed to the final product 2 via a similar oxidation system again (Table 2, Entries [2][3][4][5][6][7][8][11][12][13]. The plausible mechanism is also supported by the isolation of 3 which was oxidized under the same reaction conditions to quantitatively give 2, 6a and the fact that the added phosphine ligand converted to the corresponding phosphine oxide.…”

“…The apparatus was calibrated with [Ni(en) 3 ][S 2 O 3 ] (en = ethane-1,2-diamine). 13 Diamagnetic corrections were made by Pascal's constant. 14 The effective magnetic moment was calculated using the equation µ eff = 2.828 (χ AT ) 1/2 , where χ A is the magnetic susceptibility per cobalt atom.…”