Nitrosyliron complexes of macrocyclic [N42−] and open-chain [N2O22−] chelate ligands: influence of the equatorial ligand on the NO binding mode

Synthesis and magnetic properties of new dinuclear iron(II) complexes of a phenylene‐bridge shiff base analogue dinucleating ligand

“…of their pyridine and DMAP diadducts [11,12]. In this work, synthesis and characterization of the first dinuclear iron(II) complexes with pyridine as axial ligands will be presented.…”

New tetradentate N2O2-ligands based on 2-ethoxymethylidene-3-oxo-3-polyfluoroalkylpropionates and ethylenediamine

“…Jäger et al [10][11][12][13] described a large series of openchain azomethine N 2 O 2 -ligands based on 2-ethoxymethylidene-1,3-dicarbonyl compounds and 1,2-diamines, which were used to synthesize coordination compounds with nickel(II), copper(II), cobalt(II), and iron(II). Studies on the properties of these complexes, such as electronic state of the central atom, reductive potential, and ability to transfer and activate oxygen, carbon dioxide, nitrogen oxide, etc., showed their structural and functional similarity to active sites of metalloenzymes [14,15].…”

New enamine ligands derived from ethyl 2-ethoxymethylidene-3-oxo-3-polyfluoroalkylpropionates and o-phenylenediamine

“…Non fluorinated 2 ethoxy methylidene 1,3 dicarbonyl compounds in reactions with 1,2 diamines form biscondensation products at the ethoxymethylidene moiety 10-12 and related metal com plexes. [13][14][15][16] It is possible to obtain monocondensation products [17][18][19] from which symmetric and asymmetric ligands 20 were synthesized, including the macrocyclic ligands 15,17-20 used in the synthesis of the metallocomplex compounds. [17][18][19][20] Schiff bases obtained by transformations of 2 ethoxymethylidene 3 oxo 3 fluoroalkylpropionates with different diamines can also serve as organic mol ecules forming the ligand shell.…”

“…85.31(6) O(1)-Cu(1)-Cl (2) 90.19(5) N(1)-Cu(1)-Cl(2) 175.31(5) N(2)-Cu(1)-Cl (2) 92.63(5) C(9)-O(1)-Cu (1) 127.28(14) C(12)-N(1)-C (1) 122.57(16) C(12)-N(1)-Cu(1) 125.09 (14) C(1)-N(1)-Cu(1) 112.31(12) C(2)-N(2)-Cu(1) 109.38(12) C(9)-C(8)-C(12) 121.65(17) C(9)-C(8)-C (7) 121.86 (18) In each case, the presence of intense absorption bands of stretching vibrations corresponding to two carbonyl groups (1710-1697 and 1673-1647 cm -1 ) and NH and NH 2 groups (3254-3177 cm -1 ) also indicates that they exist are the Е isomer of the aminoketone tautomer stabilized by the intramolecular hydrogen bond between the oxygen atom of the polyfluoroacyl moiety and the hydrogen atom of the NH group. The IR spectrum of compound 2a in a 3% solution of CHCl 3 exhibits a considerable broadening of absorption bands of vibrations of almost all characteristic groups.…”