Facial co-ordination in bis[bis(benzimidazol-2-ylmethyl)-amine]copper(II) perchlorate dihydrate. Synthesis, structure, spectra and redox behaviour

Polymer Conjugates of Photoinducible CO‐Releasing Molecules

“…Bpma-type ligands usually coordinate facially, but they can also coordinate meridionally. [42][43][44][45] Additionally, in complexes 2 and 4 the OH func-tionality of the ligand could serve as a donor. Using X-ray analysis we evidenced that the Mn(CO) 3 core was facially coordinated by the bpma ligand.…”

Structures, spectra, and DNA-binding properties of mixed ligand copper(II) complexes of iminodiacetic acid: The novel role of diimine co-ligands on DNA conformation and hydrolytic and oxidative double strand DNA cleavage

“…This is in contrast the meridional coordination of the imda anion in [Cu(imda)(H 2 O) 2 ] [42]. The possible rationale [38,43] for the observed preference for the equatorial positioning the -COO À groups in this complex is the shortest (1.962 Å ) and hence the strongest bonds formed by the -COO À and secondary amines, defining the equatorial xy-plane, rather than one of them defaulting to a more weakly bound z-axial position as in the present complexes 1-3. Thus, one of the strongly coordinating carboxylate oxygen atoms of imda anion in this complex is displaced from the equatorial plane to occupy the axial position because of the strong chelation of the diimines in the equatorial plane.…”

Synthesis and Biophysical Studies of Bis‐Macrocyclic Cobalt/Copper(II) Complexes Having a Pyridine Spacer with CT DNA and 5′‐GMP

“…6) shows a well-defined redox process corresponding to the formation of the Cu II /Cu I couple with a formal potential E 0 ¼ À 0.375 V. The couple is found to be quasi-reversible with DE p ¼ 70 mV and the ratio of the anodic to cathodic peak currents (I pa /I pc ¼ 0.23) correspond to a simple one-electron process. The large peak-width for the one electron couple Cu II /Cu I indicates the structural reorganization of the coordination sphere during the electron transfer [69]. Upon the addition of CT DNA, the formal electrode potential E 0 ( À 0.415 V) shifts towards more negative values.…”