Synthesis And Absorbing Properties Of Chiral Monamine Schiff Base And Theirs Complexes

Schiff base belongs to a kind of compound containing an imine group(>C=N–). As the nitrogen atoms easily coordinate with metal ions to form complexes with electronic and magnetic properties, the Schiff base complexes have potential value in stealth materials. Recently, some Schiff base complexes have been reported in stealth materials.In the paper, twenty chiral Schiff bases and ten Fe complexes were synthesized and characterized by mass spectrometry, nuclear magnetic resonance, infrared spectroscopy, single crystal X-ray diffraction analysis and atomic absorption spectrometry. The conductivity and electromagnetic parameters of some of the complexes were measured. The paper was divided into five parts.Firstly, this paper briefly introduced the synthesis mechanism and method of the chiral Schiff base, and the research progress in application of the absorbing materials.Secondly, seven chiral Schiff bases were synthesized by interaction of L-2-amino propanol with salicylaldehyde, cinnamic aldehyde, 2-thiophenecarboxaldehyde, p-hydroxybenzaldehyde, 3-nitrobenzaldehyde, p-dimethylaminobenzaldehyde and 1,4-phthalaldehyde, respectively. The complexes were synthesized by interaction of above chiral Schiff bases and Iron(III) nitrate nonahydrate, respectively. The structures and chirality of the ligands and complexes were characterized by melting point, optical rotation, infrared spectrum, nuclear magnetic resonance, mass spectrometry, atomic absorption spectrometry and single crystal X-ray diffraction.Thirdly, six chiral Schiff bases were synthesized by interaction of L-phenylglycinol with salicylaldehyde, cinnamic aldehyde, 2-thiophenecarboxaldehyde, p-hydroxybenzaldehyde, 3-nitrobenzaldehyde and p-dimethylaminobenzaldehyde, respectively. The complexes were synthesized by interaction of above chiral Schiff bases and Iron(III) nitrate nonahydrate, respectively. The structures and chirality of the ligands and complexes were characterized by melting point, optical rotation, infrared spectrum, nuclear magnetic resonance, mass spectrometry, atomic absorption spectrometry and single crystal X-ray diffraction.Fourthly, seven chiral Schiff bases were synthesized by interaction of(R)-(+)-α-methylbenzylamine with salicylaldehyde, cinnamic aldehyde, 2-thiophene- carboxaldehyde, p-hydroxybenzaldehyde, 3-nitrobenzaldehyde, p-dimethylaminobenzaldehyde and 1,4-phthalaldehyde, respectively. The complexes were synthesized by interaction of above chiral Schiff bases and Iron(III) nitrate nonahydrate, respectively. The structures and chirality of the ligands and complexes were characterized by melting point, optical rotation, infrared spectrum, nuclear magnetic resonance, mass spectrometry, atomic absorption spectrometry and single crystal X-ray diffraction.Finally, the chiral Schiff base Fe(III) complexes and their composite materials with CNTs were tested for electrical conductivity; some chiral Schiff base Fe(III) complexes and its composite materials with CNTs were tested for electromagnetic parameters and the absorbing capacity were studied. Composite absorbing materials with good absorbing performance were obtained by adjusting the composite proportion.