The effect of alkali and Ce(III) ions on the response properties of benzoxazine supramolecules prepared via molecular assembly.
A series of benzoxazine monomer supramolecules with different substituted groups on their benzene ring was prepared with a Mannich reaction and characterized by FTIR, 1H-NMR and MS. The obtained products were 3,4-dihydro-3-(2'-hydroxyethylene)-6-methyl-2H-benzoxazine (BM1), 3,4-dihydro-3-(2'-hydroxyethylene)-6-ethyl-2H-benz-oxazine (BM2), and 3,4-dihydro-3-(2'-hydroxyethylene)-6-methoxy-2H-benzoxazine (BM3). The efficiency of alkali metal ion extraction from the products was determined with Pedersen's technique, while the complexation of the Ce(III) ion was confirmed by the Job's and the mole ratio methods. The evidence of complex formation between benzoxazine monomers and Ce(III) ions was obtained with FTIR and a computational simulation. Single phase ceria (CeO₂) as observed with XRD was successfully prepared by calcinating the Ce(III)-benzoxazine monomer complexes at 600 °C for 2 h. In addition, the geometry of the ceria nanoparticles confirmed by TEM is spherical, with an average diameter of 10-20 nm.
Department of Materials Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand.
Attaphon
A
Kaewvilai
Sawittree
S
Rujitanapanich
Worawat
W
Wattanathana
Chatchai
C
Veranitisagul
Songwut
S
Suramitr
Nattamon
N
Koonsaeng
Apirat
A
Laobuthee
D048588:Benzoxazines / Q000138:chemical synthesis* / Q000737:chemistry; D002563:Cerium / Q000737:chemistry* / Q000302:isolation & purification; D003198:Computer Simulation; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry; D008672:Metals, Alkali / Q000737:chemistry* / Q000302:isolation & purification; D008956:Models, Chemical; D053758:Nanoparticles; D010316:Particle Size; D033362:Powder Diffraction; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014961:X-Ray Diffraction
C571650:3,4-dihydro-3-(2'-hydroxyethylene)-6-ethyl-2H-benzoxazine; C571652:3,4-dihydro-3-(2'-hydroxyethylene)-6-methoxy-2H-benzoxazine; C571649:3,4-dihydro-3-(2'-hydroxyethylene)-6-methyl-2H-benzoxazine; D048588:Benzoxazines; D056831:Coordination Complexes; D008672:Metals, Alkali; D002563:Cerium