{"id":22378,"date":"2020-05-23T21:12:45","date_gmt":"2020-05-23T20:12:45","guid":{"rendered":"https:\/\/www.ch.imperial.ac.uk\/rzepa\/blog\/?p=22378"},"modified":"2020-05-23T21:56:01","modified_gmt":"2020-05-23T20:56:01","slug":"the-strongest-bond-in-the-universe-revisited-ten-years-on","status":"publish","type":"post","link":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22378","title":{"rendered":"The strongest bond in the universe: revisited ten years on."},"content":{"rendered":"<div class=\"kcite-section\" kcite-section-id=\"22378\">\n<p>I occasionally notice that posts that first appeared here many years ago suddenly attract attention. Thus this post, entitled <a href=\"https:\/\/www.ch.imperial.ac.uk\/rzepa\/blog\/?p=2707\" target=\"_blank\" rel=\"noopener noreferrer\">The strongest bond in the universe<\/a>, from ten years back, has suddently become the most popular, going from an average of 0-2 hits per day to 92 in a single day on May 22nd (most views appear to originate from India). I can only presume that a university there has set some course work on this topic and Google has helped some of the students identify my post. Well, re-reading something you wrote ten years ago can be unsettling. Are the conclusions still sound? Would I establish my claim the same way now? After all, one picks up a little more experience in ten years. So here is my revisitation.<\/p>\n<p>The hypothesis was that mono and then diprotonating dinitrogen strengthened the N-N bond, in the sequence\u00a0N\u2261N \u2192 H-N\u2261N<sup>+<\/sup> \u2192 H-N\u2261N-H<sup>2+<\/sup> to the point that the latter was now a candidate for the strongest known bond between two (non-hydrogen) atoms. One of my original criteria was to calculate the N-N stretching wavenumber. To get this, I had to project out the coupling between the N-N stretching mode and the H-N modes in the latter two species. In the original discussion, Igor suggested another candidate O<sub>2<\/sub><sup>2+\u00a0<\/sup>in the comments. I speculated that the heavy atom diatomic force constant might be a better way of estimating how strong the bond was rather than the stretching wavenumber, but I never followed this up! So time to do so now.<\/p>\n<p>The calculations are now at the CCSD(T)\/Def2-TZVPP level (FAIR DOI: <a href=\"https:\/\/doi.org\/10.14469\/hpc\/7214\">10.14469\/hpc\/7214<\/a>).<\/p>\n<table style=\"width: 42.845810739898546%; height: 154px;\" border=\"&quot;1\">\n<tbody>\n<tr style=\"height: 44px;\">\n<th style=\"height: 44px;\">Species<\/th>\n<th style=\"height: 44px;\">Heavy atom Force constant, mDyne\/\u00c5<\/th>\n<th style=\"height: 44px;\">Projected heavy atom stretch, cm<sup>-1<\/sup><\/th>\n<th>Bond length, \u00c5<\/th>\n<\/tr>\n<tr style=\"height: 22px;\">\n<td style=\"height: 22px;\">N\u2261N<\/td>\n<td style=\"height: 22px;\">45.5177<\/td>\n<td style=\"height: 22px;\">2349<\/td>\n<td>1.1029<\/td>\n<\/tr>\n<tr style=\"height: 22px;\">\n<td style=\"height: 22px;\">HN\u2261N<sup>+<\/sup><\/td>\n<td style=\"height: 22px;\">50.2662<\/td>\n<td style=\"height: 22px;\">2469<\/td>\n<td>1.0983<\/td>\n<\/tr>\n<tr style=\"height: 22px;\">\n<td style=\"height: 22px;\">HN\u2261NH<sup>2+<\/sup><\/td>\n<td style=\"height: 22px;\"><strong><span style=\"color: #ff0000;\">56.4903<\/span><\/strong><\/td>\n<td style=\"height: 22px;\"><span style=\"color: #ff0000;\">2617<\/span><\/td>\n<td><span style=\"color: #ff0000;\">1.0859<\/span><\/td>\n<\/tr>\n<tr style=\"height: 22px;\">\n<td style=\"height: 22px;\">O\u2261O<sup>2+<\/sup><\/td>\n<td style=\"height: 22px;\">44.9542<\/td>\n<td style=\"height: 22px;\">2184<\/td>\n<td>1.0510<\/td>\n<\/tr>\n<tr style=\"height: 22px;\">\n<td style=\"height: 22px;\">N\u2261O<sup>1+<\/sup><\/td>\n<td style=\"height: 22px;\">49.0119<\/td>\n<td style=\"height: 22px;\">2365<\/td>\n<td>1.0678<\/td>\n<\/tr>\n<tr style=\"height: 22px;\">\n<td style=\"height: 22px;\">HN\u2261O<sup>2+<\/sup><\/td>\n<td style=\"height: 22px;\">50.8061<\/td>\n<td style=\"height: 22px;\">2411<\/td>\n<td>1.065<\/td>\n<\/tr>\n<tr style=\"height: 22px;\">\n<td style=\"height: 22px;\">HN\u2261C<\/td>\n<td style=\"height: 22px;\">38.4408<\/td>\n<td style=\"height: 22px;\">2234<\/td>\n<td>1.175<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>I did learn one new trick. To project out mode mixing between the hydrogen stretch and the heavy atom stretch, the hydrogen atom masses are now set at 10,000! This has the effect of suppressing any mode mixing, but it also results in exactly the same reduced mass for the NN stretch (14.0) for the three species N\u2261N, H-N\u2261N(+) and H-N\u2261N-H(2+), thus facilitating a like for like comparison. Ten years ago I had also tried the other direction, setting the mass of H to 0.001. Although this latter also eliminates the mode mixing, it does not result in the same reduced masses for the NN mode. So we will stick to the heavy hydrogen projection for comparisons.<\/p>\n<p>The force constant increases almost linearly on mono and then diprotonation of dinitrogen, reaching <strong>56.5<\/strong> mDyne\/\u00c5. In comparison, both O<sub>2<\/sub><sup>2+<\/sup> and NO<sup>1+<\/sup> are a little lower. Does monoprotonating NO<sup>1+<\/sup> strengthen its bond? Yes, but not quite surpassing HN\u2261NH<sup>2+<\/sup>. And the neutral HN\u2261C, which is isoelectronic with HN\u2261N<sup>+<\/sup>, also\u00a0shows a weaker bond.<\/p>\n<p>So my revisitation ten years on still shows that diprotonated nitrogen has the strongest bond (presumably in the universe), as now judged by the diatomic force constant. The hunt is still on for a species where the force constant between two non-hydrogen atoms is higher. Maybe I will return in another ten years to see the state of this challenge!<\/p>\n<!-- kcite active, but no citations found -->\n<\/div> <!-- kcite-section 22378 -->","protected":false},"excerpt":{"rendered":"<p>I occasionally notice that posts that first appeared here many years ago suddenly attract attention. Thus this post, entitled The strongest bond in the universe, from ten years back, has suddently become the most popular, going from an average of 0-2 hits per day to 92 in a single day on May 22nd (most views [&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-22378","post","type-post","status-publish","format-standard","hentry","category-interesting-chemistry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The strongest bond in the universe: revisited ten years on. - 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=22378\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The strongest bond in the universe: revisited ten years on. - Henry Rzepa&#039;s Blog\" \/>\n<meta property=\"og:description\" content=\"I occasionally notice that posts that first appeared here many years ago suddenly attract attention. Thus this post, entitled The strongest bond in the universe, from ten years back, has suddently become the most popular, going from an average of 0-2 hits per day to 92 in a single day on May 22nd (most views [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22378\" \/>\n<meta property=\"og:site_name\" content=\"Henry Rzepa&#039;s Blog\" \/>\n<meta property=\"article:published_time\" content=\"2020-05-23T20:12:45+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-05-23T20:56:01+00:00\" \/>\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=\"3 minutes\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"The strongest bond in the universe: revisited ten years on. - 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=22378","og_locale":"en_GB","og_type":"article","og_title":"The strongest bond in the universe: revisited ten years on. - Henry Rzepa&#039;s Blog","og_description":"I occasionally notice that posts that first appeared here many years ago suddenly attract attention. Thus this post, entitled The strongest bond in the universe, from ten years back, has suddently become the most popular, going from an average of 0-2 hits per day to 92 in a single day on May 22nd (most views [&hellip;]","og_url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22378","og_site_name":"Henry Rzepa&#039;s Blog","article_published_time":"2020-05-23T20:12:45+00:00","article_modified_time":"2020-05-23T20:56:01+00:00","author":"Henry Rzepa","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Henry Rzepa","Estimated reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22378#article","isPartOf":{"@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22378"},"author":{"name":"Henry Rzepa","@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/#\/schema\/person\/2b40f7b9c872a4dc1547e040a11b6281"},"headline":"The strongest bond in the universe: revisited ten years on.","datePublished":"2020-05-23T20:12:45+00:00","dateModified":"2020-05-23T20:56:01+00:00","mainEntityOfPage":{"@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22378"},"wordCount":537,"commentCount":0,"articleSection":["Interesting chemistry"],"inLanguage":"en-GB","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22378#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22378","url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22378","name":"The strongest bond in the universe: revisited ten years on. - Henry Rzepa&#039;s Blog","isPartOf":{"@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/#website"},"datePublished":"2020-05-23T20:12:45+00:00","dateModified":"2020-05-23T20:56:01+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=22378#breadcrumb"},"inLanguage":"en-GB","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22378"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22378#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog"},{"@type":"ListItem","position":2,"name":"The strongest bond in the universe: revisited ten years on."}]},{"@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\/pDef7-5OW","jetpack-related-posts":[{"id":22391,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=22391","url_meta":{"origin":22378,"position":0},"title":"The strongest bond in the universe: A crystallographic reality check?","author":"Henry Rzepa","date":"May 25, 2020","format":false,"excerpt":"My previous two posts on the topic of strongest bonds have involved mono and diprotonating N2 and using quantum mechanics to predict the effect this has on the N-N bond via its length and vibrational stetching mode. Such species are very unlikely to be easily observed for verification. But how\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\/2020\/05\/Screenshot-33-1024x714.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":2707,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=2707","url_meta":{"origin":22378,"position":1},"title":"The strongest bond in the universe!","author":"Henry Rzepa","date":"October 24, 2010","format":false,"excerpt":"The rather presumptious title assumes the laws and fundamental constants of physics are the same everywhere (they may not be). With this constraint (and without yet defining what is meant by strongest), consider the three molecules: Property\u00a0 (CCSD\/aug-cc-pVTZ) N\u2261N (H-N\u2261N)+ (H-N\u2261N-H)2+ NN length, \u00c5 1.0967 1.0915 1.0795 NN stretch, cm-1\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":"","width":0,"height":0},"classes":[]},{"id":1691,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=1691","url_meta":{"origin":22378,"position":2},"title":"Quintuple bonds","author":"Henry Rzepa","date":"February 16, 2010","format":false,"excerpt":"Climbers scale Mt. Everest, because its there, and chemists have their own version of this. Ever since G. N. Lewis introduced the concept of the electron-pair bond in 1916, the idea of a bond as having a formal bond-order has been seen as a useful way of thinking about molecules.\u2026","rel":"","context":"In &quot;Hypervalency&quot;","block_context":{"text":"Hypervalency","link":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?cat=7"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2010\/02\/Cr.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":580,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=580","url_meta":{"origin":22378,"position":3},"title":"Towards the ultimate bond!","author":"Henry Rzepa","date":"August 24, 2009","format":false,"excerpt":"Chemical bonds can be assembled from components which chemists know as \u03c3, \u03c0 and \u03b4. The blog poses the question whether any bonds can be constructed which use a fourth type of component, the \u03c6.","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":"Elements in Groups 5\/15 of the Periodic Table.","src":"https:\/\/i0.wp.com\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2009\/08\/periodic-table-V.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2009\/08\/periodic-table-V.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2009\/08\/periodic-table-V.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":1174,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=1174","url_meta":{"origin":22378,"position":4},"title":"The Fine-tuned principle in chemistry","author":"Henry Rzepa","date":"November 29, 2009","format":false,"excerpt":"The \u00a0so-called \u00a0Fine tuned model of the universe asserts that any small change in several of the\u00a0dimensionless fundamental physical constants would make the universe radically different (and hence one in which life as we know it could not exist). I suggest here that there may be molecules which epitomize the\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":"Dimethyl formamide","src":"https:\/\/i0.wp.com\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2009\/11\/dmf.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":18165,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=18165","url_meta":{"origin":22378,"position":5},"title":"\u03c0-Facial hydrogen bonds to alkenes (revisited): how close can an acidic hydrogen approach?","author":"Henry Rzepa","date":"April 15, 2017","format":false,"excerpt":"Back in the early 1990s, we first discovered the delights of searching crystal structures\u00a0for unusual\u00a0bonding features. One of the first cases was a search for hydrogen bonds formed to the\u00a0\u03c0-faces of alkenes and alkynes. In those days the CSD database of crystal structures was a lot smaller (<80,000 structures; it's\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\/2017\/04\/SQ-H-pi-1024x783.jpg?resize=350%2C200","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\/22378","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=22378"}],"version-history":[{"count":12,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=\/wp\/v2\/posts\/22378\/revisions"}],"predecessor-version":[{"id":22390,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=\/wp\/v2\/posts\/22378\/revisions\/22390"}],"wp:attachment":[{"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=22378"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=22378"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=22378"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fppma_author&post=22378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}