Nuclear magnetic resonance study of the stoichiometry and stability of lithium ion complexes with two small size crown ethers in binary nitromethane-acetonitrile mixtures
Journal of Inclusion Phenomena and Macrocyclic Chemistry, ISSN: 0923-0750, Vol: 68, Issue: 3-4, Page: 431-436
2010
- 1Citations
- 6Captures
Metric Options: CountsSelecting the 1-year or 3-year option will change the metrics count to percentiles, illustrating how an article or review compares to other articles or reviews within the selected time period in the same journal. Selecting the 1-year option compares the metrics against other articles/reviews that were also published in the same calendar year. Selecting the 3-year option compares the metrics against other articles/reviews that were also published in the same calendar year plus the two years prior.
Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Article Description
Lithium-7 NMR spectrometry was used to study the complexation reaction between lithium ions and different small size crown ethers12-crown-4 (12C4), benzo-12-crown-4 (B12C4) in a number of binary nitromethane (NM)-acetonitrile (AN) mixtures. The exchange between the free and complexed lithium ion was fast on the NMR time scale and a single population average resonance was observed. Both 1:1 and 2:1 (sandwich) complexes were observed between lithium ion and 12C4 and B12C4 in pure nitromethane solution. Stepwise formation constants of the 1:1 and 2:1 (ligand/metal) complexes were evaluated from computer fitting of the NMR-mole ratio data to equations which relate the observed metal ion chemical shifts to formation constants. There is an inverse linear relationship between the logarithms of the stability constants and the mole fraction of acetonitrile in the solvent mixtures. The stability order of the 1:1 and 2:1 complexes was found to be 12C4. Li > B12C4. Li. The optimized structures of the free ligands and their 1:1 and 2:1 complexes with Li ion were predicted by ab initio theoretical calculations using the Gausian 98 software, and the results are discussed. © 2010 Springer Science+Business Media B.V.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=78649329587&origin=inward; http://dx.doi.org/10.1007/s10847-010-9806-4; http://link.springer.com/10.1007/s10847-010-9806-4; http://link.springer.com/content/pdf/10.1007/s10847-010-9806-4; http://link.springer.com/content/pdf/10.1007/s10847-010-9806-4.pdf; http://link.springer.com/article/10.1007/s10847-010-9806-4/fulltext.html; http://www.springerlink.com/index/10.1007/s10847-010-9806-4; http://www.springerlink.com/index/pdf/10.1007/s10847-010-9806-4; https://dx.doi.org/10.1007/s10847-010-9806-4; https://link.springer.com/article/10.1007/s10847-010-9806-4
Springer Science and Business Media LLC
Provide Feedback
Have ideas for a new metric? Would you like to see something else here?Let us know