{"id":94,"date":"2008-12-09T14:41:15","date_gmt":"2008-12-09T22:41:15","guid":{"rendered":"http:\/\/wordpress.reed.edu\/chem201202\/2008\/12\/cations-crowns-and-phase-transfer-catalysts.html"},"modified":"2014-03-18T10:13:06","modified_gmt":"2014-03-18T17:13:06","slug":"cations-crowns-and-phase-transfer-catalysts","status":"publish","type":"post","link":"https:\/\/blogs.reed.edu\/chem201202\/2008\/12\/cations-crowns-and-phase-transfer-catalysts\/","title":{"rendered":"Cations, crowns, and phase transfer catalysts"},"content":{"rendered":"<p>The following images (<i>click image for full-size view<\/i>) show potential maps (0 &#8211;&gt; +1500), ball-and-spoke formulas, and space-filling formulas of<\/p>\n<ul>\n<li>(CH<sub>3<\/sub>CH<sub>2<\/sub>CH<sub>2<\/sub>CH<sub>2<\/sub>)N<sup>+<\/sup> (top left)<\/li>\n<li>PhCH<sub>2<\/sub>N(Et)<sub>3<\/sub><sup>+<\/sup> (top center)<\/li>\n<li>18-crown-6(K<sup>+<\/sup>) (right)<\/li>\n<li>Li<sup>+<\/sup>, Na<sup>+<\/sup>, K<sup>+<\/sup> (bottom left)<\/li>\n<\/ul>\n<p><span class=\"\"><a href=\"https:\/\/blogs.reed.edu\/chem201202\/files\/bin\/L35.120808%20cations%20maps.html\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/blogs.reed.edu\/chem201202\/files\/bin\/L35.120808%20cations%20maps-thumb-100x64.jpg\" alt=\"L35.120808 cations maps.jpg\" class=\"mt-image-none\" width=\"100\" height=\"64\" \/><\/a><\/span><span class=\"\"><a href=\"https:\/\/blogs.reed.edu\/chem201202\/files\/bin\/L35.120808%20cations%20ballandspokes.html\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/blogs.reed.edu\/chem201202\/files\/bin\/L35.120808%20cations%20ballandspokes-thumb-100x64.jpg\" alt=\"L35.120808 cations ballandspokes.jpg\" class=\"mt-image-none\" width=\"100\" height=\"64\" \/><\/a><\/span><a href=\"https:\/\/blogs.reed.edu\/chem201202\/files\/bin\/L35.120808%20cations%20spacefillings.html\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/blogs.reed.edu\/chem201202\/files\/bin\/L35.120808%20cations%20spacefillings-thumb-100x64.jpg\" alt=\"L35.120808 cations spacefillings.jpg\" class=\"mt-image-none\" width=\"100\" height=\"64\" \/><\/a><br \/>The potentials surrounding the organic cations are more moderate, but not always for the same reason:<\/p>\n<ul>\n<li>The positive charge in the quarternary ammonium ions is formally assigned to N, but N is <u>buried<\/u> under a blanket of C &amp; H. The map surface lies rather far from N so the potential <u>on the map surface<\/u> is small.<\/li>\n<li>The positive charge in the crown ether complex is assigned to K and this atom is <u>exposed<\/u>. However, the actual potential is the sum of extreme potentials generated by K and by the surrounding six O and these offset one another.<\/li>\n<\/ul>\n<p>\n<p>\n<p>\n","protected":false},"excerpt":{"rendered":"<p>The following images (click image for full-size view) show potential maps (0 &#8211;&gt; +1500), ball-and-spoke formulas, and space-filling formulas of(CH3CH2CH2CH2)N+ (top left)PhCH2N(Et)3+ (top center)18-crown-6(K+) (right)Li+, Na+, K+ (bottom left) The potentials surrounding the organic cations are more moderate, but not&#8230;<\/p>\n","protected":false},"author":55,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-94","post","type-post","status-publish","format-standard","hentry","category-post-lecture"],"_links":{"self":[{"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/posts\/94","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/users\/55"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/comments?post=94"}],"version-history":[{"count":5,"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/posts\/94\/revisions"}],"predecessor-version":[{"id":5199,"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/posts\/94\/revisions\/5199"}],"wp:attachment":[{"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/media?parent=94"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/categories?post=94"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/tags?post=94"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}