𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Natural Abundance 17O-NMR. Study of Some Macrocyclic Complexes with Alkali Metal Cations

✍ Scribed by Alexander I. Popov; Alfred J. Smetana; Jean-Pierre Kintzinger; Thi Thanh-Tâam Nguyêen

Publisher
John Wiley and Sons
Year
1980
Tongue
German
Weight
385 KB
Volume
63
Category
Article
ISSN
0018-019X

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Complexation between crown ethers 12C4, 15C5, 18C6 and cryptand 222, and alkali cations Li^+^, Na^+^, K^+^ in various solvents were studied by ^17^O‐NMR. spectroscopy. Small diamagnetic shifts arising from the cation electric field are observed. They increase according to the sequence K^+^ < Na^+^ < Li^+^. ^17^O‐linewidth are discussed and compared to the ^13^C relaxation times. Linewidth modification results mainly from modifications of the effective correlation time. In general, for crown ethers, considerable line broadening occurs when the cation fits well into the cavity but line narrowing occurs when the cation is much smaller than the cavity.

📜 SIMILAR VOLUMES

DFT study of the cryptand and benzocrypt
DFT study of the cryptand and benzocryptand and their complexes with alkali metal cations: Li+, Na+, K+
✍ Xueye Wang; Hengliang Wang; Yuanqiang Tan 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 209 KB

## Abstract In the present work, a theoretical study of the cryptand 4, 7, 13, 16, 21, 24‐hexaoxa‐1, 10‐ diazabicyclo [8,8,8] hexacosan (the named [222]) and the cryptand 5, 6‐benzo‐4, 7, 13, 16, 21, 24‐hexaoxa‐1, 10‐diazabicyclo [8, 8, 8] hexacosan (the nemed [222B]) had been done using density fu

DFT study of the carbon- and nitrogen-pi
DFT study of the carbon- and nitrogen-pivot lariat crown ethers and their complexes with alkali metal cations: Na+, K+
✍ Xiaoyan Zheng; Xueye Wang; Shanfeng Yi; Nuanqing Wang; Yueming Peng 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 339 KB

## Abstract In this work, a quantum mechanical research of five lariat crown ethers(LCEs), 2‐methoxy‐15‐crown‐5(**A**), N‐methoxy‐4‐aza‐15‐crown‐5(**B**), N‐methoxy‐4‐aza‐18‐crown‐6(**C**), N‐methoxyethyl‐4‐aza‐18‐crown‐6(**D**), N,N′‐bis(2‐metho xyethyl)‐4,13‐diaza‐18‐crown‐6(**E**), which are bas

Density functional theory study of calix
Density functional theory study of calix[4]arene-N-azacrown-5, calix[4]arene-N-phenyl-azacrown-5, and their complexes with alkali-metal cations: Na+, K+, and Rb+
✍ Xiaoyan Zheng; Xueye Wang; Shanfeng Yi; Nuanqing Wang; Yueming Peng 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 473 KB

## Abstract Theoretical studies of 1,3‐alternate‐25,27‐bis(1‐methoxyethyl)calix[4]arene‐azacrown‐5 (**L~1~**), 1,3‐alternate‐25,27‐bis(1‐methoxyethyl)calix[4]arene‐__N__‐phenyl‐azacrown‐5 (**L~2~**), and the corresponding complexes M^+^/ **L** of **L~1~** and **L~2~** with the alkali‐metal cations: