Encapsulation of tetramethylphosphonium cations

被引：25

作者：

Beyeh, Ngong Kodiah ^{[1
]}

Valkonen, Arto ^{[1
]}

Rissanen, Kari ^{[1
]}

机构：

[1] Univ Jyvaskyla, Dept Chem, Nanosci Ctr, Jyvaskyla, Finland

来源：

SUPRAMOLECULAR CHEMISTRY | 2009年 / 21卷 / 1-2期

关键词：

supramolecular chemistry; resorcinarenes; capsules; X-ray crystallography; mass spectrometry; HOST-GUEST CHEMISTRY; GAS-PHASE; REVERSIBLE ENCAPSULATION; MOLECULAR RECOGNITION; SUPRAMOLECULAR CHEMISTRY; C-METHYL; RESORCINARENE; AMMONIUM; CAPSULES; COMPLEXATION;

D O I：

10.1080/10610270802308411

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The weak interactions and capsule formation of tetramethylphosphonium (TMP) cation with resorcinarenes 1 and 2 and the corresponding pyrogallarenes 3 and 4 were studied in the solid state by single-crystal X-ray diffraction, in solution by NMR and in the gas phase by mass spectrometry. In methanol-d4, the NMR titration studies reveal that the association constants for the 1:1 complexes of TMP@3 and TMP@4 are much higher (TMP@4:39037 M-1) than for the corresponding TMP@1 and TMP@2 (TMP@2:13010 M-1) complexes. In the gas phase both monomeric 1:1 TMP@1-TMP@4 complexes as well as the dimeric 1:2 capsule complexes, TMP@12-TMP@42 were observed. The 1:1:2 molar mixtures of 1:2:TMP or 3:4:TMP resulted in homo- and heterocapsules TMP@12, TMP@1+2 and TMP@22, with the expected statistical 1:2:1 ratio. Using the 1:1:2 ratio of 1:3:TMP, 1:4:TMP, 2:3:TMP or 2:4:TMP showed a marked prefence to the homopyrogallarene capsules TMP@32 and TMP@42, thus supporting the stronger complexation of TMP with 3 and 4 as observed in solution. The X-ray structures1 confirmed the dimeric capsular structures with only minor structural differences to the corresponding tetramethylammonium (TMA) capsules reported earlier.

引用

页码：142 / 148

页数：7

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