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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 18, Number 3
JKCSEZ 18(3)
June 20, 1974 

The Adsorption of Alkyl Aldehydes on Cations Supported by Layer Silicate. Complex Formation Theory

Layer Silicate에 지지된 양이온상에서의 알킬알데히드의 흡착기구. 착물형성 이론
Jong Taik Kim, Jong Rack Sohn

김종택, 손종락
Layer silicate 에 지지된 양이온상에서의 일어난 acetaldehyde, acrolein, 그리고 crotonaldehyde의 흡착기구에 대하여 IR과 X-ray로서 연구하였다. 1720∼1580㎝-1의 범위에서 일어난 4개의 특성적인 흡착 band를 분석한 결과 130㎝-1정도로 shift한 carbonyl band 는 >C=O…M형 complex 형성에 기인하는 것이었고, acetaldehyde는 1722㎝-1에서, 다른 알데히드는 1690㎝-1에서 sharp하게 나타난 carbonyl band는 >C=O와 surface -O-H와의 interaction에서 일어난 것이었다. 그리고 1710∼1660㎝-1에서 나타난 broad한 band는 >C=O와 양이온 -O-H와의 사이에 일어난 수소결합에 의한 것이었다. 그리고 1640∼1660㎝-1사이에 나타난 약한 band는 carbonyl group 의 강한 흡착에 의하여 오기된 >C=C< 이중결합에 의한 것이었다. 이 사실들은 X-ray 회절에 의하여 다시 확인하였다.

Adsorption mechanism of alkyl aldehydes, acetaldehyde, acrolein, and crotonaldehyde on cations supported by layer silicates was studied by means of IR spectroscopy and X-ray. An analysis of four characteristic split bands in the region of 1720~1580cm-1 was made. The carbonyl stretching band which shifted about 130cm-1 to lower frequencies was observed only for Ni2+ and Al3+ but slightly with Ca2+ at high sample temperature and was attributed to >C=O…M complex formation. A sharp band which appeared as a shoulder at 1722 for acetaldehyde and 1690 for acrolein and crotonaldehyde was responsible for the interaction of carbonyl with surface hydroxyl. The second broad band which appeared at about 1710~1660 was responsible for hydrogen bonding between carbonyl oxygen and cationic hydroxyl group. The third band which appeared at about 1640~1660 was attributed to induced >C=C< double bond due to the strong carbonyl interaction. This was supported by the interlamellar spacings obtained by X-ray diffractometry.

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