{"id":22996,"date":"2020-11-07T14:54:01","date_gmt":"2020-11-07T14:54:01","guid":{"rendered":"https:\/\/www.ch.imperial.ac.uk\/rzepa\/blog\/?p=22996"},"modified":"2023-08-28T20:14:32","modified_gmt":"2023-08-28T19:14:32","slug":"an-interesting-aromatic-molecule-found-intitans-atmosphere-cyclopropylidene","status":"publish","type":"post","link":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22996","title":{"rendered":"An interesting aromatic molecule found in Titan&#8217;s atmosphere: Cyclopropenylidene"},"content":{"rendered":"<div class=\"kcite-section\" kcite-section-id=\"22996\">\n<p>Cyclopropenylidene must be the smallest molecule to be aromatic due to \u03c0-electrons, with just three carbon atoms and two hydrogen atoms. It has now been detected in the atmosphere of Titan, one of Saturn&#8217;s moons<span id=\"cite_ITEM-22996-0\" name=\"citation\"><a href=\"#ITEM-22996-0\">[1]<\/a><\/span> and joins benzene, another aromatic molecule together with the protonated version of cyclopropenylidene, C<sub>3<\/sub>H<sub>3<\/sub><sup>+<\/sup> also found there.<\/p>\n<p><a href=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2020\/11\/cp.svg\"><img decoding=\"async\" class=\"aligncenter size-large wp-image-23009\" src=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2020\/11\/cp.svg\" alt=\"\" width=\"100\" \/><\/a><\/p>\n<p>The molecule has two \u03c0-electrons in the three membered ring and a carbene lone pair in the \u03c3-framework. As with the cyclopropenium cation (C<sub>3<\/sub>H<sub>3<\/sub><sup>+<\/sup>), these two electrons make it \u03c0-aromatic, as indicated by H\u00fcckel&#8217;s 4n+2 rule (n=0). I thought it might be fun to show the molecular orbitals containing these two pairs of electrons and then to show the result of a double excitation of the carbene lone pair into the \u03c0-system to make a anti-aromatic isomer with four \u03c0-electrons. This species is a whopping 209.3 kcal\/mol higher in free energy, made up of the double electronic excitation energy topped up by conversion of the stabilizing aromaticity into destabilizing anti-aromaticity. Because of this antiaromaticity, the excited state is in fact a second order saddle point, <a href=\"https:\/\/www.ch.imperial.ac.uk\/rzepa\/blog\/?p=2973\" target=\"_blank\" rel=\"noopener noreferrer\">avoiding anti-aromaticity<\/a> by asymmetric distortion back down to the ground state and resymmetrisation.<\/p>\n<table border=\"1\">\n<tbody>\n<tr>\n<th colspan=\"2\">Ground state of Cyclopropenylidene<\/th>\n<\/tr>\n<tr>\n<td>\n<p><div id=\"attachment_22976\" style=\"width: 260px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-22976\" class=\"size-medium wp-image-22976\" src=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2020\/11\/cp2-10.jpg\" alt=\"\" width=\"250\" \/><p id=\"caption-attachment-22976\" class=\"wp-caption-text\">Click to view 3D model of NBO 10<\/p><\/div><\/td>\n<td>\n<p><div id=\"attachment_22975\" style=\"width: 260px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-22975\" class=\"size-medium wp-image-22975\" src=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2020\/11\/cp2-8.jpg\" alt=\"\" width=\"250\" \/><p id=\"caption-attachment-22975\" class=\"wp-caption-text\">Click to view 3D model of NBO 8<\/p><\/div><\/td>\n<\/tr>\n<tr>\n<th colspan=\"2\">Doubly excited anti-aromatic state of Cyclopropenylidene<\/th>\n<\/tr>\n<tr>\n<td>\n<p><div id=\"attachment_22974\" style=\"width: 260px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-22974\" class=\"size-medium wp-image-22974\" src=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2020\/11\/cp1-10.jpg\" alt=\"\" width=\"250\" \/><p id=\"caption-attachment-22974\" class=\"wp-caption-text\">Click to view 3D model of NBO 10<\/p><\/div><\/td>\n<td>\n<p><div id=\"attachment_22973\" style=\"width: 260px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-22973\" class=\"size-large wp-image-22973\" src=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2020\/11\/cp1-8.jpg\" alt=\"\" width=\"250\" \/><p id=\"caption-attachment-22973\" class=\"wp-caption-text\">Click to view 3D model of NBO 8<\/p><\/div><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>It might be a tiny molecule, but to chemists at least it is very interesting in a historical sense at least. Curiously, the astrophysicists describe it as a &#8220;complex molecule&#8221;!<\/p>\n<h2>References<\/h2>\n    <ol class=\"kcite-bibliography csl-bib-body\"><li id=\"ITEM-22996-0\">C.A. Nixon, A.E. Thelen, M.A. Cordiner, Z. Kisiel, S.B. Charnley, E.M. Molter, J. Serigano, P.G.J. Irwin, N.A. Teanby, and Y. Kuan, \"Detection of Cyclopropenylidene on Titan with ALMA\", <i>The Astronomical Journal<\/i>, vol. 160, pp. 205, 2020. <a href=\"https:\/\/doi.org\/10.3847\/1538-3881\/abb679\">https:\/\/doi.org\/10.3847\/1538-3881\/abb679<\/a>\n\n<\/li>\n<\/ol>\n\n<\/div> <!-- kcite-section 22996 -->","protected":false},"excerpt":{"rendered":"<p>Cyclopropenylidene must be the smallest molecule to be aromatic due to \u03c0-electrons, with just three carbon atoms and two hydrogen atoms. It has now been detected in the atmosphere of Titan, one of Saturn&#8217;s moons and joins benzene, another aromatic molecule together with the protonated version of cyclopropenylidene, C3H3+ also found there. The molecule has [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"activitypub_content_warning":"","activitypub_content_visibility":"","activitypub_max_image_attachments":5,"activitypub_interaction_policy_quote":"anyone","activitypub_status":"","footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[4],"tags":[],"ppma_author":[2661],"class_list":["post-22996","post","type-post","status-publish","format-standard","hentry","category-interesting-chemistry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>An interesting aromatic molecule found in Titan&#039;s atmosphere: Cyclopropenylidene - Henry Rzepa&#039;s Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22996\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"An interesting aromatic molecule found in Titan&#039;s atmosphere: Cyclopropenylidene - Henry Rzepa&#039;s Blog\" \/>\n<meta property=\"og:description\" content=\"Cyclopropenylidene must be the smallest molecule to be aromatic due to \u03c0-electrons, with just three carbon atoms and two hydrogen atoms. It has now been detected in the atmosphere of Titan, one of Saturn&#8217;s moons and joins benzene, another aromatic molecule together with the protonated version of cyclopropenylidene, C3H3+ also found there. The molecule has [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22996\" \/>\n<meta property=\"og:site_name\" content=\"Henry Rzepa&#039;s Blog\" \/>\n<meta property=\"article:published_time\" content=\"2020-11-07T14:54:01+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-08-28T19:14:32+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2020\/11\/cp.svg\" \/>\n<meta name=\"author\" content=\"Henry Rzepa\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Henry Rzepa\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"An interesting aromatic molecule found in Titan's atmosphere: Cyclopropenylidene - Henry Rzepa&#039;s Blog","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22996","og_locale":"en_GB","og_type":"article","og_title":"An interesting aromatic molecule found in Titan's atmosphere: Cyclopropenylidene - Henry Rzepa&#039;s Blog","og_description":"Cyclopropenylidene must be the smallest molecule to be aromatic due to \u03c0-electrons, with just three carbon atoms and two hydrogen atoms. 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The molecule has [&hellip;]","og_url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22996","og_site_name":"Henry Rzepa&#039;s Blog","article_published_time":"2020-11-07T14:54:01+00:00","article_modified_time":"2023-08-28T19:14:32+00:00","og_image":[{"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2020\/11\/cp.svg","type":"","width":"","height":""}],"author":"Henry Rzepa","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Henry Rzepa","Estimated reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22996#article","isPartOf":{"@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22996"},"author":{"name":"Henry Rzepa","@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/#\/schema\/person\/2b40f7b9c872a4dc1547e040a11b6281"},"headline":"An interesting aromatic molecule found in Titan&#8217;s atmosphere: Cyclopropenylidene","datePublished":"2020-11-07T14:54:01+00:00","dateModified":"2023-08-28T19:14:32+00:00","mainEntityOfPage":{"@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22996"},"wordCount":305,"commentCount":2,"image":{"@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22996#primaryimage"},"thumbnailUrl":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2020\/11\/cp.svg","articleSection":["Interesting chemistry"],"inLanguage":"en-GB","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22996#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22996","url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22996","name":"An interesting aromatic molecule found in Titan's atmosphere: Cyclopropenylidene - Henry Rzepa&#039;s Blog","isPartOf":{"@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22996#primaryimage"},"image":{"@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22996#primaryimage"},"thumbnailUrl":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2020\/11\/cp.svg","datePublished":"2020-11-07T14:54:01+00:00","dateModified":"2023-08-28T19:14:32+00:00","author":{"@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/#\/schema\/person\/2b40f7b9c872a4dc1547e040a11b6281"},"breadcrumb":{"@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22996#breadcrumb"},"inLanguage":"en-GB","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22996"]}]},{"@type":"ImageObject","inLanguage":"en-GB","@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22996#primaryimage","url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2020\/11\/cp.svg","contentUrl":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2020\/11\/cp.svg"},{"@type":"BreadcrumbList","@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22996#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog"},{"@type":"ListItem","position":2,"name":"An interesting aromatic molecule found in Titan&#8217;s atmosphere: Cyclopropenylidene"}]},{"@type":"WebSite","@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/#website","url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/","name":"Henry Rzepa&#039;s Blog","description":"Chemistry with a twist","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-GB"},{"@type":"Person","@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/#\/schema\/person\/2b40f7b9c872a4dc1547e040a11b6281","name":"Henry Rzepa","image":{"@type":"ImageObject","inLanguage":"en-GB","@id":"https:\/\/secure.gravatar.com\/avatar\/897b6740f7f599bca7942cdf7d7914af5988937ae0e3869ab09aebb87f26a731?s=96&d=blank&r=g370be3a7397865e4fd161aefeb0a5a85","url":"https:\/\/secure.gravatar.com\/avatar\/897b6740f7f599bca7942cdf7d7914af5988937ae0e3869ab09aebb87f26a731?s=96&d=blank&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/897b6740f7f599bca7942cdf7d7914af5988937ae0e3869ab09aebb87f26a731?s=96&d=blank&r=g","caption":"Henry Rzepa"},"description":"Henry Rzepa is Emeritus Professor of Computational Chemistry at Imperial College London.","sameAs":["https:\/\/orcid.org\/0000-0002-8635-8390"],"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?author=1"}]}},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/pDef7-5YU","jetpack-related-posts":[{"id":24067,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=24067","url_meta":{"origin":22996,"position":0},"title":"Dimerisation of cyclopropenylidene: what are the correct &#8220;curly arrows&#8221; for this process?","author":"Henry Rzepa","date":"July 21, 2021","format":false,"excerpt":"In another post, a discussion arose about whether it might be possible to trap\u00a0cyclopropenylidene to form a small molecule with a large dipole moment. Doing so assumes that cyclopropenylidene has a sufficiently long lifetime to so react, before it does so with itself to e.g. dimerise. That dimerisation has an\u2026","rel":"","context":"In &quot;Curly arrows&quot;","block_context":{"text":"Curly arrows","link":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?cat=2327"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":11421,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=11421","url_meta":{"origin":22996,"position":1},"title":"Six vs ten aromatic electrons?","author":"Henry Rzepa","date":"October 20, 2013","format":false,"excerpt":"Homoaromaticity is a special case of\u00a0aromaticity\u00a0in which\u00a0\u03c0-conjugation\u00a0is interrupted by a single sp3\u00a0hybridized\u00a0carbon atom (it is sometimes referred to as a suspended \u03c0-bond with no underlying \u03c3-foundation).\u00a0But consider the carbene shown below. This example comes from a recently published article which was highlighted on Steve Bachrach's blog. Here aromaticity has resulted\u2026","rel":"","context":"In &quot;Interesting chemistry&quot;","block_context":{"text":"Interesting chemistry","link":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?cat=4"},"img":{"alt_text":"Click for  3D","src":"https:\/\/i0.wp.com\/www.ch.imperial.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2013\/10\/B10-sigma.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":24769,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=24769","url_meta":{"origin":22996,"position":2},"title":"An unusually small (doubly) aromatic molecule: C4.","author":"Henry Rzepa","date":"March 15, 2022","format":false,"excerpt":"When you talk \u03c0-aromaticity, benzene is the first molecule that springs to mind.\u00a0But there are smaller molecules that can carry this property; cyclopropenylidene (five atoms) is the smallest in terms of atom count I could think of until now, apart that is from H3+ which is the smallest possible molecule\u2026","rel":"","context":"In &quot;General&quot;","block_context":{"text":"General","link":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?cat=1"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":16758,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=16758","url_meta":{"origin":22996,"position":3},"title":"What&#8217;s in a name? Carbenes:  a reality check.","author":"Henry Rzepa","date":"September 11, 2016","format":false,"excerpt":"To quote from Wikipedia: in chemistry, a carbene is a molecule containing a neutral carbon atom with a valence of two and two unshared valence electrons. The most ubiquitous type of carbene of recent times is the one shown below as 1, often referred to as a resonance stabilised or\u2026","rel":"","context":"In &quot;crystal_structure_mining&quot;","block_context":{"text":"crystal_structure_mining","link":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?cat=1745"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":24129,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=24129","url_meta":{"origin":22996,"position":4},"title":"Sterically stabilized cyclopropenylidenes. An example of Octopus publishing?","author":"Henry Rzepa","date":"August 15, 2021","format":false,"excerpt":"Whilst I was discussing the future of scientific publication in the last post, a debate was happening behind the scenes regarding the small molecule cyclopropenylidene. This is the smallest known molecule displaying\u00a0\u03c0-aromaticity, but its high reactivity means that it is unlikely to be isolated in the condensed phase. A question\u2026","rel":"","context":"In &quot;crystal_structure_mining&quot;","block_context":{"text":"crystal_structure_mining","link":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?cat=1745"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2021\/08\/Screenshot-814-1024x792.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":24881,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=24881","url_meta":{"origin":22996,"position":5},"title":"A four-atom molecule exhibiting simultaneous compliance with H\u00fcckel 4n+2 and Baird 4n selection rules for ring aromaticity.","author":"Henry Rzepa","date":"March 22, 2022","format":false,"excerpt":"Normally, aromaticity is qualitatively assessed using an electron counting rule for cyclic conjugated rings. The best known is the H\u00fcckel 4n+2 rule (n=0,1, etc) for inferring diatropic aromatic ring currents in singlet-state \u03c0-conjugated cyclic molecules\u2021 and a counter 4n rule which infers an antiaromatic paratropic ring current for the system.\u2026","rel":"","context":"In &quot;Interesting chemistry&quot;","block_context":{"text":"Interesting chemistry","link":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?cat=4"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/C2B2-300x212.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]}],"jetpack_likes_enabled":false,"authors":[{"term_id":2661,"user_id":1,"is_guest":0,"slug":"admin","display_name":"Henry Rzepa","avatar_url":"https:\/\/secure.gravatar.com\/avatar\/897b6740f7f599bca7942cdf7d7914af5988937ae0e3869ab09aebb87f26a731?s=96&d=blank&r=g","0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""}],"_links":{"self":[{"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=\/wp\/v2\/posts\/22996","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=22996"}],"version-history":[{"count":17,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=\/wp\/v2\/posts\/22996\/revisions"}],"predecessor-version":[{"id":26397,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=\/wp\/v2\/posts\/22996\/revisions\/26397"}],"wp:attachment":[{"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=22996"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=22996"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=22996"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fppma_author&post=22996"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}