ChemInform Abstract: CRYSTAL STRUCTURE AND ELECTRONIC PROPERTIES OF AMMINE(TRIS(2‐AMINOETHYL)AMINE)COPPER(II) DIPERCHLORATE AND POTASSIUM PENTAAMMINECOPPER(II) TRIS(HEXAFLUOROPHOSPHATE)

Bio-inspired oxidation chemistry of a Cu(II)-fluoride cryptate with C3-symmetry

“…The UV/Vis spectrum of [LTEAHCuF](BF 4 ) 2 in MeCN has d→d transitions at 690 nm (ε = 180 M -1 cm -1 ) and 860 nm (ε = 168 M -1 cm -1 ) that are traditionally associated with TBP complexes (Figure 3A). [37][38][39] Its EPR spectrum is best fitted to a mononuclear Cu(II) complex (S = 1/2) with a d(z 2 ) 1 ground state where g∥ = 2.065, A∥ = 68 G, g⊥ = 2.221 and A⊥ = 82 G (Figure 4). The ordering of g⊥ > g∥ confirms the TBP geometry in solution.…”

“…The UV/Vis spectra of the two chloride complexes show retention of a square-based geometry in solution, confirmed by the two characteristic transitions at 580 and 770 nm associated with square-pyramidal or square-planar geometries (Figure 5). [37,40] The geometry of [LTEAHCuF](BF 4 ) 2 is influenced by solvent and the protonation state of the cryptand.…”

“…This addition of base leads to a complex with a square-based geometry evidenced by absorption bands at 580 nm (ε = 135 M -1 cm -1 ) and 672 (ε = 120 M -1 cm -1 ). [37,40] The protonated cryptate can be regenerated by addition of an acid (Figure 3C).…”