CLPOT有機1次元細孔を用いたNNラジカル包接体のTG-DTA測定

摘要

CLPOT1次元細孔を鋳型とし，包接量はわずかであるが，NNラジカルをゲストとした包接体の合成に成功した。TG-DTAを通して，試料の組成や包接体中のゲスト分子の吸着状態についての知見を得られた。また，ESRを用いて一次元細孔中のNNラジカルの分子配向や運動を解析することができた。[（有機一次元細孔物質）-（有機ラジカル）]包接体の研究においてTG-DTAは欠かすことができない測定手法であり，その結果に多くの期待が寄せられている。%Current topics in the thermogravimetric-differential thermal analysis (TG-DTA) of inclusion compounds (ICs) synthesized using one-dimensional (1-D) organic porous materials such as 2,4,6-tris-(4-chlorophenoxy)-1,3,5-triazine (CLPOT), and 4-X-phenylnitronylnitroxide (4-XPNN) radicals such as phenylnitronylnitroxide (PhNN) and p-nitrophenylnitronylnitroxide (p-NPNN), are reviewed. Each NN radical included in the CLPOT nanochannels with spacer molecules such as N-phenyl maleimide (N-PhMI) for dilution, or even without spacer molecules, was stable above ca. 200 ℃, at which temperatures bulk PhNN or p-NPNN are usually decomposed. These results demonstrate that NN radicals can be included in CLPOT nanochannels and remain stable, even during electron spin resonance (ESR) spectroscopy at high temperatures up to 150 ℃. Therefore, NN groups may be used as an ESR spin probe like many of the derivatives of 2,2,6,6-tetramethyl-1-piperidinyloxyl (TEMPO) to examine the local structure of crystalline/amorphous porous materials, polymers, and membranes.