Checking for the possibility of an ‘amidomethyl’ N-substituent being involved in the iminodiacetat–copper(II) chelation: synthesis, molecular and crystal structure and properties of (imidazole)( N -carbamoylmethyl-iminodiacetat)copper(II), [Cu(ADA)(ImH)]

摘要: Abstract The stoichiometric reaction of copper(II) hydroxycarbonate, N-carbamoylmethyl-iminodiacetic acid [H2ADA=H2NCOCH2N(CH2CO2H)2)], and imidazole (ImH) in water yields crystalline samples (imidazole)(N-carbamoylmethyl-iminodiacetate)copper(II), [Cu(ADA)(ImH)] (compound I). compound was characterized by TG analysis (with IR study the evolved gasses) spectral (IR, electronic ESR spectra) single crystal X-ray diffraction methods. In I, ADA acts as a tetradentate ligand Cu(II) atom exhibiting square base pyramidal coordination (type 4+1). Coordination bond distances (A): Cu(1)–N=2.040(2), Cu(1)–O(11)=1.943(2), Cu(1)–O(21)=1.964(2) Cu(1)–O(31)=2.322(2) with Cu(1)–N(1)=1.960(2) ImH. chelating role is discussed on basis preference to O(amido) donor (versus N one) occupy an axial/remote position around well expected mer-chelating configuration ‘Cu–iminodiacetato’ moiety (Cu–IDA) upon imidazole–copper(II) studied mixed-ligand complex I (having 1:1:1 Cu/ADA/ImH molar ratio).