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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Synthesis, Characterization, and Small Hydrocarbon Encapsulation of Dicavitand-Porphyrins
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Synthesis, Characterization, and Small Hydrocarbon Encapsulation of Dicavitand-Porphyrins

机译:二氨酸 - 卟啉的合成,表征和小烃封装

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摘要

New host molecules "Dicavitand-Porphyrins" [H2C2P(syn,syn) (3), H2C2P(syn,anti) (4)] with small cavities on one or both sides of the porphyrin plane were synthesized from 5,10-bis(2,6-dihydroxyphenyl)-15,20-diphenylporphyrin and bis(chloromethyl)cavitand in 15 and 34% yield, respectively. Similarity of guest size selectivity of the host 4 in comparison with the reported "Cavitand-porphyrin" [H2CP(syn) (1)] suggests that these hosts have the same cavity size. The 1:1 and 1:2 association constants (K-11 and K-12) of the guest encapsulations into 3 were also obtained by H-1 NMR titration and nonlinear least square fittings. The guest size dependences of K-11, and K-12 values of 3 show that the initial cavity prefers larger guests such as ethane, while the second one does not. The induced-fit type very small structural changes (estimated within 1 angstrom) upon first guest encapsulation of the host 3 affects the guest encapsulation of the other cavity through the covalent linkages.
机译:新的宿主分子“DiCavitand-卟啉”[H2C2P(SYN,SYN)(3),H2C2P(SYN,抗)(4)],在卟啉平面的一个或两侧的一个或两侧上的小腔中合成( 2,6-二羟基苯基)-15,20-二苯基卟啉和双(氯甲基)离子酸分别为15至34%的产率。 与报道的“Cavitand-Porphylin”相比,主持人4的客观尺寸选择性的相似性表明这些宿主具有相同的腔体尺寸。 通过H-1 NMR滴定和非线性最小二乘配件,将客体封装的1:1和1:2的关联常数(K-11和K-12)得到3。 k-11的客人尺寸依赖性和k-12值为3显示初始腔更喜欢乙烷的更大的客人,而第二个腔体不会。 在首次访客3的客体封装时,诱导型型结构变化(估计在1埃内)影响通过共价连接的其他腔的访客封装。

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