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Α Β Γ Δ Ε Ζ Η Θ Ι Κ Λ Μ Ν Ξ Ο Π Ρ Σ Τ Υ Φ Χ Ψ Ω α β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ σ τ υ φ χ ψ ω

á à Á À é è É È ç Ç ê

Ä Ö Ü ä ö ü ß

ְ ֳ ֲ ֱ ָ ַ ֵ ֶ ִ ֹ ּ ֻ ׂ ׁ ּ פ ם ן ו ט א ר ק ף ך ל ח י ע כ ג ד ש ץ ת צ מ נ ה ב

‘ ’ “ ” 〔〕〈〉「」『』【】＂（）［］｛｝

± × ÷ ≠ ≤ ≥ ∞ ∴ ♂ ♀ ∠ ⊥ ⌒ ∂ ∇ ≡ ≒ ≪ ≫ √ ∽ ∝ ∵ ∫ ∬ ∈ ∋ ⊆ ⊇ ⊂ ⊃ ∪ ∩ ∧ ∨ ￢ ⇒ ⇔ ∀ ∃ ∮ ∑ ∏ ＋－＜＝＞

、。 · ‥ … ¨ 〃 ― ∥ ＼ ∼ ´ ～ ˇ ˘ ˝ ˚ ˙ ¸ ˛ ¡ ¿ ː ！＇，．／：；？＾＿｀｜

½ ⅓ ⅔ ¼ ¾ ⅛ ⅜ ⅝ ⅞ ¹ ² ³ ⁴ ⁿ ₁ ₂ ₃ ₄

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′ ″ ℃ Å ￠￡￥ ¤ ℉ ‰ ＄％Ｆ￦㎕㎖㎗ ℓ ㎘㏄㎣㎤㎥㎦㎙㎚㎛㎜㎝㎞㎟㎠㎡㎢㏊㎍㎎㎏㏏㎈㎉㏈㎧㎨㎰㎱㎲㎳㎴㎵㎶㎷㎸㎹㎀㎁㎂㎃㎄㎺㎻㎽㎾㎿㎐㎑㎒㎓㎔ Ω ㏀㏁㎊㎋㎌㏖㏅㎭㎮㎯㏛㎩㎪㎫㎬㏝㏐㏓㏃㏉㏜㏆

§ ※ ☆ ★ ○ ● ◎ ◇ ◆ □ ■ △ ▽ → ← ↑ ↓ ↔ 〓 ◁ ◀ ▷ ▶ ♤ ♠ ♡ ♥ ♧ ♣ ⊙ ◈ ▣ ◐ ◑ ▒ ▤ ▥ ▨ ▧ ▦ ▩ ♨ ☏ ☎ ☜ ☞ ¶ † ‡ ↕ ↗ ↙ ↖ ↘ ♭ ♩ ♪ ♬ ㉿㈜ № ㏇ ™ ㏂㏘ ℡ ＃＆＊＠ ª º

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1
Ferro- and antiferromagnetic coupling in a chlorido-bridged, tetranuclear Cu(II) complex

Grosshauser, Michael,Comba, Peter,Kim, Jee Young,Ohto, Keisuke,Thué,ry, Pierre,Lee, Young Hoon,Kim, Yang,Harrowfield, Jack The Royal Society of Chemistry 2014 Dalton Transactions Vol.43 No.15
- 원문보기
A bispidine-like ligand involving four pyridine-N and three aliphatic-N donor atoms forms a bimetallic species with CuCl2 in which all seven N-donors are bound and which aggregates in the crystal through double chloride-bridging to give a tetranuclear unit. The magnetism of this solid can be interpreted in terms of a relatively weak antiferromagnetic coupling between the two Cu(II) centres of the dinuclear subunits and a strong ferromagnetic coupling of the Cu(II) centres in different dinuclear units involved in the bis-chlorido bridge. In solution, the assembly decays into the dinuclear subunits and, in agreement with the solid state studies, the interaction between the corresponding CuII centres is shown to be primarily due to dipole–dipole coupling. Graphic AbstractA binuclear complex of copper(II) chloride with a heptadentate bispidine-like ligand undergoes dimerisation in the solid state involving chloride bridging and leading to both ferro- and antiferromagnetic coupling of the Cu(II) centres. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4dt00305e'>
2
Preliminary Investigation of Organocatalyst Activity Based on C-Arylcalix[4]-2-Methylresorcinarene Sulfonic Acid Materials for Biodiesel Production

Jumina,Ifa Amalina,Sugeng Triono,Yehezkiel Steven Kurniawan,Yoga Priastomo,Keisuke Ohto,Bohari M. Yamin 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.3
At present, biodiesel remains an untapped fuel source while crude oil reserves are being depleted. Extensive efforts are necessary to achieve efficient biodiesel production, but catalytic activity in methyl palmitate production remains unsatisfactory. In this study, we report the synthesis and organocatalyst activity of C-arylcalix[4]-2-methylresorcinarene sulfonic acids for biodiesel production. The presence of a methyl group on an aromatic ring is expected to disturb the intramolecular hydrogen bonds; thus, each hydroxyl group could be utilized for the catalytic process. C-arylcalix[4]-2-methylresorcinarene sulfonic acids were prepared from cyclocondensation and sulfonation reactions yielding compounds 1?6 at rates of 66.7%?86.6%. By evaluating the organocatalytic activity of the C-arylcalix[4]-2-methylresorcinarene sulfonic acids, we found that 4?mol% of compound 5 exhibited the highest yield (97.8%) of methyl palmitate at 338?K for 6-h reaction time, which is remarkable. These findings show that C-arylcalix[4]-2-methylresorcinarene sulfonic acids are promising heterogeneous catalyst materials for biodiesel production.
3
Adsorption Characteristics of Pb(II) and Cr(III) onto C-Methylcalix[4]resorcinarene

Jumina, Jumina,Sarjono, Ratnaningsih Eko,Siswanta, Dwi,Santosa, Sri Juari,Ohto, Keisuke Korean Chemical Society 2011 대한화학회지 Vol.55 No.3
- 원문보기 2
  DBpia
  
  ScienceON
C-Metylcalix[4]resorcinarene(CMCR)에서 Pb(II)와 Cr(III)의 흡착 특징에 대한 연구는 수행되어왔다. CMCR은 resorcinol, acetaldehyde 그리고 HCl로 부터 1단계 합성으로 만들어졌다. 일괄처리시스템에서 대부분의 변수는 CMCR이 Pb(II)와 Cr(III)에 대해 좋은 흡착제라는 것을 확인했다. Cr(III)은 Pb(II)보다 더 크게 흡착되지만 Cr(III)의 흡착속도는 Pb(II) 보다 더 느리다. Pb(II)와 Cr(III) 흡착의 흡착운동에너지는 batch안에서 유사 2차 운동 모델을 따른다. 그러나 고정상 컬럼 시스템에서 Pb(II)의 운동에너지는 일차 모델을 따른다. 흡착된 Pb(II)을 되찾기 위한 탈착 연구는 증류수와 HCl을 가지고 순차적으로 수행되었다. 그리고 그 결과는 흡착은 화학흡착에 의해 지배된다는 것을 보여주었다. A study on the adsorption characteristics of Pb(II) and Cr(III) cations onto C-methylcalix[4]resorcinarene (CMCR) has been conducted. CMCR was produced by one step synthesis from resorcinol, acetaldehyde, and HCl. Most parameters in batch system confirm that CMCR is a good adsorbent for Pb(II) and Cr(III). Cr(III) uptake was bigger than that of Pb(II), but Cr(III) adsorption rate was slower than Pb(II). The adsorption kinetic of Pb(II) and Cr(III) adsorptions in batch followed pseudo $2^{nd}$ order kinetics model, but the kinetic of Pb(II) adsorption in fixed bed column system followed first order model. Desorption studies to recover the adsorbed Pb(II) was performed sequentially with distilled water and HCl, and the results showed that the adsorption was dominated by chemisorption.