{"id":244258,"date":"2025-07-04T22:44:10","date_gmt":"2025-07-04T22:44:10","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=244258"},"modified":"2025-07-04T22:44:12","modified_gmt":"2025-07-04T22:44:12","slug":"based-on-ir-spectra-of-coononh35cl2-and-cono2nh35cl2-complexes-indicate-the-differences","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/04\/based-on-ir-spectra-of-coononh35cl2-and-cono2nh35cl2-complexes-indicate-the-differences\/","title":{"rendered":"Based on IR spectra of [Co(ONO)(NH3)5]Cl2 and [Co(NO2)(NH3)5]Cl2 complexes, indicate the differences."},"content":{"rendered":"\n<p>Based on IR spectra of [Co(ONO)(NH3)5]Cl2 and [Co(NO2)(NH3)5]Cl2 complexes, indicate the differences.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-1-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p>The IR spectra of the two cobalt complexes, <strong>[Co(ONO)(NH\u2083)\u2085]Cl\u2082<\/strong> and <strong>[Co(NO\u2082)(NH\u2083)\u2085]Cl\u2082<\/strong>, can be used to distinguish between the bonding modes of the ligands, <strong>ONO\u207b<\/strong> (nitrito) and <strong>NO\u2082\u207b<\/strong> (nitro), which are attached to the cobalt center.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Key Differences in IR Spectra:<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Nitrito vs Nitro Ligand<\/strong>:\n<ul class=\"wp-block-list\">\n<li>In <strong>[Co(ONO)(NH\u2083)\u2085]Cl\u2082<\/strong>, the <strong>ONO\u207b<\/strong> ligand typically binds to the metal via the oxygen atom. This leads to an IR absorption in the range of <strong>\u223c1500\u20131550 cm\u207b\u00b9<\/strong> for the <strong>\u03bd(O\u2013Co)<\/strong> stretching vibration, characteristic of the nitrito group when it coordinates through the oxygen atom.<\/li>\n\n\n\n<li>In <strong>[Co(NO\u2082)(NH\u2083)\u2085]Cl\u2082<\/strong>, the <strong>NO\u2082\u207b<\/strong> ligand usually coordinates through the nitrogen atom. The <strong>\u03bd(N\u2013Co)<\/strong> stretching vibration of this nitro group appears in a different range, typically around <strong>\u223c1300\u20131380 cm\u207b\u00b9<\/strong>.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Symmetry of Ligands<\/strong>:\n<ul class=\"wp-block-list\">\n<li><strong>ONO\u207b<\/strong> can exhibit different vibrational modes based on its binding, and the <strong>\u03bd(O\u2013N) stretching vibration<\/strong> often appears around <strong>\u223c1260\u20131300 cm\u207b\u00b9<\/strong>.<\/li>\n\n\n\n<li>For <strong>NO\u2082\u207b<\/strong>, the <strong>\u03bd(N\u2013O) stretching<\/strong> vibration typically appears at <strong>\u223c1320\u20131370 cm\u207b\u00b9<\/strong> for the asymmetric stretching mode, and the <strong>\u03bd(N\u2013O) symmetric stretch<\/strong> might appear slightly lower.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Ligand-Specific Bands<\/strong>:\n<ul class=\"wp-block-list\">\n<li><strong>NO\u2082\u207b<\/strong> has a characteristic <strong>asymmetric stretching band<\/strong> that appears in the range of <strong>\u223c1500\u20131600 cm\u207b\u00b9<\/strong> (depending on the exact environment), whereas <strong>ONO\u207b<\/strong> does not have such a prominent band in this region.<\/li>\n\n\n\n<li>The <strong>NO\u2082<\/strong> complex will also display a <strong>\u03bd(NO\u2082)<\/strong> stretching band around <strong>1350 cm\u207b\u00b9<\/strong>, indicative of the <strong>NO\u2082\u207b<\/strong> group, which is not present in the spectrum of the <strong>ONO\u207b<\/strong> complex.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Summary:<\/h3>\n\n\n\n<p>The key difference between the IR spectra lies in the distinct stretching frequencies of the NO\u2082 and ONO ligands. The <strong>[Co(ONO)(NH\u2083)\u2085]Cl\u2082<\/strong> complex exhibits a higher-frequency <strong>\u03bd(O\u2013Co)<\/strong> band and a characteristic <strong>\u03bd(O\u2013N)<\/strong> band, while <strong>[Co(NO\u2082)(NH\u2083)\u2085]Cl\u2082<\/strong> displays distinct <strong>\u03bd(N\u2013O)<\/strong> stretching vibrations and a prominent <strong>\u03bd(NO\u2082)<\/strong> band. These spectral features help differentiate between the <strong>nitrito<\/strong> and <strong>nitro<\/strong> coordination modes.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/07\/learnexams-banner8-125.jpeg\" alt=\"\" class=\"wp-image-244259\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Based on IR spectra of [Co(ONO)(NH3)5]Cl2 and [Co(NO2)(NH3)5]Cl2 complexes, indicate the differences. The Correct Answer and Explanation is: The IR spectra of the two cobalt complexes, [Co(ONO)(NH\u2083)\u2085]Cl\u2082 and [Co(NO\u2082)(NH\u2083)\u2085]Cl\u2082, can be used to distinguish between the bonding modes of the ligands, ONO\u207b (nitrito) and NO\u2082\u207b (nitro), which are attached to the cobalt center. Key Differences [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-244258","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/244258","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=244258"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/244258\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=244258"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=244258"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=244258"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}