Co(II)-amino acid–CaAl-layered double hydroxide composites – Construction and characterization.

Abstract The construction of Co(II)-amino acid complexes (l -histidine, l -cysteine, l -tyrosine) among the layers of CaAl-layered double hydroxide was attempted. The stepwise intercalation (introducing the anionic form of the amino acid first, then constructing the Co(II) complex) proved to be unsuccessful, while the direct ion exchange of the anionic form of the separately prepared complex provided with the Co(II) complex intercalated substances. The success of the intercalation was verified by X-ray diffractometry. The resulting composite materials were structurally characterized by a range of instrumental methods like UV–vis, inductively coupled plasma–optical emission, mid-range as well as far infrared spectroscopies and scanning electron microscopy. Highlights • Attempted intercalation of Co(II)-amino acid complexes among the layers of CaAl-LDH. • Successful intercalation was achieved using the anionic forms of the separately prepared complexes. • Verification by powder X-ray diffractometry. • Mapping the possible coordination sites with classical and instrumental methods. [ABSTRACT FROM AUTHOR]