21 research outputs found
The complexation of N,N'-Bis(difluorobenzyl)-4,13-diaza-18-crown-6 ether containing partially fluorinated side arms and alkali metal ions
๋ฒค์ง๊ธฐ์ ๊ณ ๋ฆฌ์ ํ๋ฃจ์ค๋ฅดํ๋ ํ ๋ฌ๋ฆฐ N,N'-Bis(2,6-difluorobenzyl)-4,13-diaza-18-crown-6 (1)๊ณผ N,N'-Bis(3,5-difluorobenzyl)-4,13-diaza-18-crown-6 (2)์ ์ํ
๋ฅด๋ฅผ ํฉ์ฑํ๊ณ ํฉ์ฑ๋ ์ํ
๋ฅด์ ํธ์คํธ์ ์์นผ๋ฆฌ ๊ธ์์ด์จ๊ณผ์ ์ฐฉ๋ฌผ ํน์ฑ์ ์ฐ๊ตฌํ์๋ค. ํธ์คํธ์ ์์นผ๋ฆฌ ๊ธ์์ด์จ์ ์ฐฉ๋ฌผ ์กฐ์ฑ๋น๊ฐ 1:1์ธ ๊ฒ์ NMR๋ฒ์ผ๋ก ํ์ธํ๊ณ ์ ์์ฐจ ์ ์ ๋ฒ์ผ๋ก ์ฐฉ๋ฌผ ์์ ๋ ์์๋ฅผ ๊ตฌํ์๋ค. ์ฐฉ๋ฌผ์ ์์ ๋ ์์๋ K^(+)๏ผRb^(+)๏ผCs^(+) = Na^(+)์ ์์ด์๋ค. ์์นผ๋ฆฌ ๊ธ์์์๋ ํธ์คํธ์ ๋๊ณตํฌ๊ธฐ(1.34-1.43 โซ)์ ๊ธ์ ์ด์จ์ ํฌ๊ธฐ(K^(+):1.38โซ)๊ฐ ํฐ ์ํฅ์ ๋ฐ์ K^(+)์ ์์ ๋ ์์๊ฐ ๊ฐ์ฅ ํฌ๋ค. ์์นผ๋ฆฌ ๊ธ์์์ ๋ถ๋ถ์ ์ผ๋ก ํ๋ฃจ์ค๋ฅดํ๋ ํ ๋ฌ๋ฆฐ ๋น์ทํ ํธ์คํธ 1๊ณผ 2์ ์ฐฉ๋ฌผ ์์ ๋ ์์์์ 1-K^(+) ์ 1-Cs^(+)์ ์ฐฉ๋ฌผ์ ์์ ๋ ์์๊ฐ 2์ ์์ ๋ ์์๋ณด๋ค๋ ๋ ํฐ ๊ฐ์ ๊ฐ๊ณ ์ด๋ ยนH-NMR CIS๊ฐ ํฐ ์ ๊ณผ๋ ์ผ์นํ์๋ค.The diaza-18-crown-6 ethers containing partially fluorinated side arms were synthesized. The compound of N,N'-Bis(2,6-difluorobenzyl)-4,13-diaza-18-crown-6(1), N,N'-Bis(3,5-difluorobenzyl)-4,13-diaza-18-crown-6(2) have side arms with partially fluorinated phenyl group. This compounds were used as hosts in hosts-guest chemistry. In study of the complexes composition ratio of host with alkali metal ion, complexes of host and metal were 1:1 ratio because of inflection point at [Metal]/[Host]=1 by NMR. The stability constants for two hosts in alkali metal ions determined by potentiometric method, the order of stability constants for hosts in alkali metals were K^(+)๏ผRb^(+)๏ผCs^(+) = Na^(+). The largest value of K^(+) for hosts consist in similar size of cavity(1.34-1.43โซ) for diazacrown and cation ion size(1.38 โซ) for K^(+). Specially, the stability constants of 1-K^(+) complex was much larger than that of 2-K^(+) complex. The stability constants of 1-K^(+) and Cs^(+) is large than that 2. This fact coincide with the results of ยนH-NMR CIS.ope