• 제목/요약/키워드: N,N,N',N'-Tetraethylethylenediamine

검색결과 2건 처리시간 0.014초

Selective Crystallization of SAPO-5 and SAPO-34 Molecular Sieves in Alkaline Condition: Effect of Heating Method

  • Yoon, Ji-Woong;Jhung, Sung-Hwa;Kim, Young-Ho;Park, Sang-Eon;Chang, Jong-San
    • Bulletin of the Korean Chemical Society
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    • 제26권4호
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    • pp.558-562
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    • 2005
  • Crystallization of SAPO-5 and SAPO-34 molecular sieves with microwave and conventional electric heating of the same gel has been investigated in an alkaline condition using N,N,N’N’tetraethylethylenediamine as a template molecule. SAPO-5 structure can be selectively prepared with microwave heating because of the fast crystallization of the technique. On the other hand, SAPO-34 is the sole product with usual conventional electric heating because SAPO-5 can be gradually transformed into SAPO-34 structure with an increase in crystallization time. This phase selectivity is probably because of the relative stability of the two phases at the reaction conditions (kinetic effect). Crystallization with microwave heating can be suggested as a phase selective synthesis method for relatively unstable materials because of fast crystallization.

고감도 수용체에 의한 ClO4- 검출 : 수용액에서 주-객 이온간의 평형 (Detection of ClO4- via A Hypersensitive Receptor : Unusual Electrostatic Equilibria between Host and Guest in Aqueous Media)

  • 이영아;홍종기;정옥상
    • 분석과학
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    • 제15권1호
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    • pp.31-35
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    • 2002
  • ${CIO_4}^-$ 이온만을 선택적으로 감지하는 새로운 수용체가 개발되었다. $[Pd(Me_4en)(Py_2S){\cdot}2ClO_4]_4$ ($Me_4en$ = N,N,N'N'-tetraethylethylenediamine; $Py_2S$ = 4,4'-dipyridyl sulfide) 착화합물에서 주-객 화학종 간의 고감도 작용력을 연구하였다. $Py_2S$의 피리딜 기는 온도, 농도, 매개체 등에 아주 민감한 두 가지의 셋트의 $^1H$ NMR, 공명 시그날을 보여주었다. 이러한 NMR 거동을 수용액에서 고리 사합체의 양이온과 ${CIO_4}^-$ 음이온 간의 정기적 인력에 의한 평형 때문인 것으로 해석되었다.