Copper(II) complexes containing a 12-membered macrocyclic ligand

Polyurethane with tethered copper(II)–cyclen complex: Preparation, characterization and catalytic generation of nitric oxide from S-nitrosothiols

“…Nonetheless, the UV and EPR spectra, as well as the NO detection experiments (see below) support the fact that Cu(II)-cyclen complexes are in fact linked to the hydrophilic thermoplastic PU. Indeed, the Cu(II)-cyclen complex is known to have a square pyramidal structure with an absorption band in the region 550-670 nm in the visible region of the spectrum [36]. While the λ max of Cu(II)(cyclen)Cl 2 has been reported to be 594 nm in water [36], a film of Cu(II)-cyclen-PU (5) has an absorption maximum at 617 nm when in a fully hydrated state (see Figure 2 (A)).…”

“…Indeed, the Cu(II)-cyclen complex is known to have a square pyramidal structure with an absorption band in the region 550-670 nm in the visible region of the spectrum [36]. While the λ max of Cu(II)(cyclen)Cl 2 has been reported to be 594 nm in water [36], a film of Cu(II)-cyclen-PU (5) has an absorption maximum at 617 nm when in a fully hydrated state (see Figure 2 (A)). Such a bathochromic shift in λ max has been observed in a previous study [16], where the Cu(II)-cyclen complex was covalently attached within a crosslinked poly(2-hydroxyethyl methacrylate) (pHEMA) film.…”

Synthesis and Characterization of New Tetraaza Macrocycles Bearing Two or Four N-Methoxyethyl Pendant Arms and Their Copper(II) and/or Nickel(II) Complexes

“…[20][21][22][23] It has been widely observed that regular and distorted trigonal bipyramidal copper(II) complexes exhibit an absorption band at > 670 nm, whereas square-pyramidal copper(II) complexes show an absorption band at considerably shorter wavelength. [20][21][22] Therefore, the coordination geometry may be considered intermediate between TBP and SP in the solid state. Unfortunately, we Notes were unable to isolate single crystals of the complex suitable for X-ray work.…”

Template Synthesis of Copper(II) Complexes of N3O-Donor Macrotricycles Containing N-CH2-N and N-CH2-O Linkages

“…[18][19][20][21] It has been also observed that regular and distorted square-pyramidal copper(II) complexes exhibit a d-d transition band in the region 550-670 nm, whereas trigonal bipyramidal ones show a maximum absorption at > 670 nm. 18,19,[21][22][23] Unfortunately, we could not obtain single crystals of the copper(II) complexes suitable for X-ray work, and their crystal structures have not been investigated. However, the longer wavelengths and the larger molar absorption coefficients for [CuL (Table 2) …”