Crystal structure, solid state and solution characterisation of copper(II) coordination compounds of ethyl 5-methyl-4-imidazolecarboxylate (emizco)

2D and 3D Supramolecular Structures of trans- and cis-Octahedral Coordination Compounds of Ethyl-5-methyl-4-imidazolecarboxylate with Transition Metal Ions

“…In Figure 8 is shown the π stacking and hydrogen bonding, which extend the crystal lattice in the bc crystallographic plane, stabilizing a 2D supramolecular arrangement. Similar interactions were found in the analogous copper(II) compound [23].…”

“…A partial electronic delocalization on the chelate ring is observed, N3=C4 1.377 (3) In the previously reported analogous copper(II) compound cis [Cu(emizco) 2 Br 2 ], the chelate angles are larger, O6-Cu1-N3 75.91(15)° and O16-Cu1-N13 74.44(14)°, while the coordination bond lengths are shorter when changing cadmium(II) for copper(II) [23]. The smaller chelate angles are those of the cisoctahedral compound 4, compared with the trans-octahedral 3 (Fig.…”

“…For the trans compounds 1-3, [Cd(emizco) 2 (H 2 O) 2 ](NO 3 ) 2 3 presents the longest coordination bond lengths and the smallest chelate angle 73.22(5)°, whereas for the cobalt(II) and nickel(II) compounds as the coordination bond lengths get shorter, the chelate angle increases (Tables 2 and 3). Two intramolecular hydrogen bonds in the emizco ligand, O6 … C7 2.707 Å and O7 … C9 3.078 Å, [23] are conserved in all coordination compounds, as depicted for [Co(emizco) 2 (H 2 O) 2 ](NO 3 ) 2 1 (Fig. 3).…”

“…Ethyl 5-methyl-4-imidazolecarboxylate (hereafter abbreviated emizco), is used as an intermediate in the synthesis of a variety of imidazolic compounds with pharmacological proper-ties [21,22]. Previously, we have investigated the coordination compounds of emizco with copper(II) [23], and the biological activity of its transition metal complexes on photosynthesis. They showed to be inhibitors of the photosynthetic electron flow and ATP-synthesis [24,25].…”

Spectroscopic (IR, Raman, UV–Vis) study and thermal analysis of 3d-metal complexes with 4-imidazolecarboxylic acid

“…Many crystalline structures of 3d-metals complexes with derivatives of 4-imidazolecarboxylic acid have been described in the literature. A nitrogen atom of the imidazole ring participate in the coordination of metal by ligand (e.g., nitroimidazole complexes with copper, cobalt and zinc [12], 4-imidazoleacetate with manganese [13], 5-methylimidazolecarboxylate with copper [14], cadmium, nickel and cobalt [15], or complexes of 4,5-imidazoledicarboxylic acid with 3d metals [16,17]). When the nitrogen atom is in close proximity to the carboxylic group, the metal is coordinated through nitrogen atom and carboxylic group.…”