Nonplanar amide groups as ligands

High-valent iron complexes with tetraamido macrocyclic ligands: Structures, Mössbauer spectroscopy, and DFT calculations

“…The ketone C@O bond distance is 1.211(5) Å . Dunitz amide values signify degrees of amide nonplanarity [17][18][19]. This redox innocent macrocyclic ligand has high resistance to oxidative degradation and extremely strong r-donor capacity from the deprotonated amide-N donors.…”

Amides Nonplanar Solely by CN Bond Rotation

“…This bonding term should be encouraged by the presence of the strong x-back-bonding CN ligands. [6] Crystal data for NaK,-Z.CH,OH, 3 H,O: space group P2,/c, a = 9.869(1), b = 17.323 (2), c = 16.083(3) A, = 94.85(1)", V = 2739.7(7) A', 2 = 4; 1606 independent reflections with I > 30(I): four-circle diffractometer, Cu,., 3" I 2 6 I 115". Lorentz, polarization, and adsorption corrections and corrections for linear decay were applied to the 3766 independent reflections collected.…”

Synthesis, characterization, and thermal and antimicrobial studies of newly developed transition metal–polychelates derived from polymeric Schiff base

“…A polymeric Schiff base (PSB) is an important class of coordination polymers, which have multidentate donor sites or groups and known to form polychelates with transition metal ions readily. 13 The basic properties of Schiff base polymers are due to the linkage of azomethine group (C¼ ¼N) in the polymeric backbone. 14 In general, these polymers are insoluble in common organic solvents and infusible or melted at high temperature, 15 which impede their use in certain domains.…”

“…In the reaction conditions set for condensation, the azomethine bonds (C¼ ¼N) of the Schiff base did not undergo hydrolytic cleavage. As a part of our ongoing research, this article deals with the synthesis of formaldehyde-based piperazine containing PSB and characterized using various spectral (IR, 1 H-NMR, 13 C-NMR, and UV-visible) and physicochemical techniques. The elemental analysis, magnetic moment measurements, thermal property, the type of chelation of ligand, and the geometry of the central metal ion are discussed.…”