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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 17, Number 4
JKCSEZ 17(4)
August 20, 1973 

Adsorption Mechanism of Alkyl Ketones on Cation Supported by Layer Silicate. Link Formation of Hydroxyl Group

Layer Silicate에 지지된 양이온상에서 일어나는 Alkyl Ketones의 흡착기구. 수산기의 Link 형성이론
Jong Taik Kim, Jong Rack Sohn

김종택, 손종락
Li+, Na+, K+, Ca2+, Ni2+, Al3+, 과 F3+의 양이온을 포화시킨 Wyoning montmorillonite에 acetone, methyl-ethyl ketone. diethyl ketone을 가열용 i.r. gas cell 내에서 각각 다른 압력아래 흡착시켜 4000∼1200cm-1에서 나타났으며 이들은 양이온의 수산기 및 흡착수와 그리고 표면수산기와 수소결합을 일으키는 결과로 나타났다. OH 흡수 spectra의 강도는 양이온의 수산기의 resonance 이론을 뒷받침해 주었다. coordinate bond를 일으키는 경향은 계산한 C=O기의 산소의 formal charge의 크기와 잘 맞았다.

The self supported film specimen of Wyoming montmorillonite as a layer silicate saturated by cations, Li+, Na+, K+, Ca2+, Ni2+, Al3+and Fe3+, were allowed to contact acetone, methyl-ethyl ketone and diethyl ketone within the heatable gas cell. The i.r. spectra between 4000~1200cm-1 at different pressures of adsorbates indicated bond formation through carbonyl oxygen. Two types of carbonyl bond shift with maxima at 1713 and 1690cm-1 are attributed as coordinate bond formation of carbonyl with either surface hydroxyl or cationic hydroxyl group. The intensity of the νOH was analyzed and resonance form of cationic hydroxyl was proposed as an adsorption site. The tendency to form coordinate bond was in good agreement with calculated formal charge of carbonyl oxygen in an increasing order, acetone < methyl-ethyl ketone < diethyl ketone. As an additional mechanism of adsorption, weak hydrogen bonding of methyl hydrogen with surface oxygen was observed.

247 - 255
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