{"id":17089,"date":"2016-11-14T17:21:26","date_gmt":"2016-11-14T17:21:26","guid":{"rendered":"http:\/\/www.ch.imperial.ac.uk\/rzepa\/blog\/?p=17089"},"modified":"2016-12-03T10:18:26","modified_gmt":"2016-12-03T10:18:26","slug":"hydrogen-bonding-to-chloroform","status":"publish","type":"post","link":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=17089","title":{"rendered":"Hydrogen bonding to chloroform."},"content":{"rendered":"<div class=\"kcite-section\" kcite-section-id=\"17089\">\n<p>Chloroform, often in the deuterated form CDCl<sub>3<\/sub>, is a very common solvent for NMR and other types of spectroscopy. Quantum mechanics\u00a0is increasingly used to calculate such spectra to aid assignment and the solvent is here normally simulated as a continuum rather than by explicit inclusion of one or more chloroform molecules. But what are the features of the hydrogen bonds that form from chloroform to other acceptors? Here I do a quick search for the common characteristics of such interactions.<\/p>\n<ol>\n<li>This first search (R &lt; 0.05, no errors, no disorder) is for interactions from the CH&#8230; O, and is a plot of that distance against the angle subtended at the oxygen.\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-17090\" src=\"http:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2016\/11\/ClCHO-rt.jpg\" alt=\"clcho-rt\" width=\"450\" srcset=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2016\/11\/ClCHO-rt.jpg 725w, https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2016\/11\/ClCHO-rt-300x201.jpg 300w\" sizes=\"(max-width: 725px) 100vw, 725px\" \/><\/p>\n<p>Note that there are not that many crystalline examples. The &#8220;hotspot&#8221; is at a distance of ~2.3\u00c5, but real examples down to 1.9\u00c5 exist. The angle subtended at the oxygen is close to 120\u00b0 (the angle subtended at the hydrogen is always close to 180\u00b0). The plot below constrains the search to data collected below 140K to reduce the thermal noise in the measurements, with the hotspot shortening slightly to 2.2\u00c5.\u00a0<img decoding=\"async\" class=\"aligncenter size-full wp-image-17091\" src=\"http:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2016\/11\/ClCHO-140.jpg\" alt=\"clcho-140\" width=\"450\" srcset=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2016\/11\/ClCHO-140.jpg 723w, https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2016\/11\/ClCHO-140-300x213.jpg 300w\" sizes=\"(max-width: 723px) 100vw, 723px\" \/><\/p>\n<\/li>\n<li>The next search is for interactions to N rather than O (T &lt; 140K). There are rather fewer hits, but again with similar features.<img decoding=\"async\" class=\"aligncenter size-full wp-image-17094\" src=\"http:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2016\/11\/ClCHN-140.jpg\" alt=\"clchn-140\" width=\"450\" srcset=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2016\/11\/ClCHN-140.jpg 719w, https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2016\/11\/ClCHN-140-300x187.jpg 300w\" sizes=\"(max-width: 719px) 100vw, 719px\" \/><\/li>\n<li>Finally, an attempt to see if there is a correlation between the C-H length and the H&#8230;O length.\u00a0<img decoding=\"async\" class=\"aligncenter size-full wp-image-17095\" src=\"http:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2016\/11\/CH-vs-CO.jpg\" alt=\"ch-vs-co\" width=\"450\" srcset=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2016\/11\/CH-vs-CO.jpg 723w, https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2016\/11\/CH-vs-CO-300x218.jpg 300w\" sizes=\"(max-width: 723px) 100vw, 723px\" \/>\n<p>This has odd characteristics, which suggests that in most cases the C-H distance is not measured from the diffraction data but simply &#8220;idealised&#8221; (and which therefore renders this plot meaningless). Unless its been added recently, it is not possible to specify in the search how the hydrogen positions have been refined, if at all and hence to restrict the search only to those structures where the C-H distance is meaningful.<\/p>\n<\/li>\n<\/ol>\n<p>In the last ten years or so, great progress has been made in assigning experimental spectra with the help of quantum calculations. This is true of chemical shifts in NMR, but especially so for chiroptical measurements such as ORP, ECD and VCD. Given that explicit hydrogen bonds can introduce anisotropy into the otherwise isotropic solvent continuum, it might be worth including perhaps one chloroform molecule into these calculations, especially if the \u00a0CH&#8230;O distance is &lt;2\u00c5 (which suggests it is fairly strong). If nothing else, chloroform is rather big and might exert effects based on dispersion attractions or steric repulsions as well as the H-bonding.<\/p>\n<!-- kcite active, but no citations found -->\n<\/div> <!-- kcite-section 17089 -->","protected":false},"excerpt":{"rendered":"<p>Chloroform, often in the deuterated form CDCl3, is a very common solvent for NMR and other types of spectroscopy. Quantum mechanics\u00a0is increasingly used to calculate such spectra to aid assignment and the solvent is here normally simulated as a continuum rather than by explicit inclusion of one or more chloroform molecules. But what are the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_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},"jetpack_post_was_ever_published":false},"categories":[1745],"tags":[49,1912,1911,1913,1449,1705,33],"ppma_author":[2661],"class_list":["post-17089","post","type-post","status-publish","format-standard","hentry","category-crystal_structure_mining","tag-chemical-shifts","tag-chloroform","tag-deuterated-chloroform","tag-deuterated-methanol","tag-hydrogen-bond","tag-nuclear-magnetic-resonance","tag-spectroscopy"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hydrogen bonding to chloroform. - 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=17089\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hydrogen bonding to chloroform. - Henry Rzepa&#039;s Blog\" \/>\n<meta property=\"og:description\" content=\"Chloroform, often in the deuterated form CDCl3, is a very common solvent for NMR and other types of spectroscopy. Quantum mechanics\u00a0is increasingly used to calculate such spectra to aid assignment and the solvent is here normally simulated as a continuum rather than by explicit inclusion of one or more chloroform molecules. But what are the [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=17089\" \/>\n<meta property=\"og:site_name\" content=\"Henry Rzepa&#039;s Blog\" \/>\n<meta property=\"article:published_time\" content=\"2016-11-14T17:21:26+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2016-12-03T10:18:26+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2016\/11\/ClCHO-rt.jpg\" \/>\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=\"2 minutes\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Hydrogen bonding to chloroform. - 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=17089","og_locale":"en_GB","og_type":"article","og_title":"Hydrogen bonding to chloroform. - Henry Rzepa&#039;s Blog","og_description":"Chloroform, often in the deuterated form CDCl3, is a very common solvent for NMR and other types of spectroscopy. Quantum mechanics\u00a0is increasingly used to calculate such spectra to aid assignment and the solvent is here normally simulated as a continuum rather than by explicit inclusion of one or more chloroform molecules. But what are the [&hellip;]","og_url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=17089","og_site_name":"Henry Rzepa&#039;s Blog","article_published_time":"2016-11-14T17:21:26+00:00","article_modified_time":"2016-12-03T10:18:26+00:00","og_image":[{"url":"http:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2016\/11\/ClCHO-rt.jpg","type":"","width":"","height":""}],"author":"Henry Rzepa","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Henry Rzepa","Estimated reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=17089#article","isPartOf":{"@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=17089"},"author":{"name":"Henry Rzepa","@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/#\/schema\/person\/2b40f7b9c872a4dc1547e040a11b6281"},"headline":"Hydrogen bonding to chloroform.","datePublished":"2016-11-14T17:21:26+00:00","dateModified":"2016-12-03T10:18:26+00:00","mainEntityOfPage":{"@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=17089"},"wordCount":399,"commentCount":5,"image":{"@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=17089#primaryimage"},"thumbnailUrl":"http:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2016\/11\/ClCHO-rt.jpg","keywords":["chemical shifts","Chloroform","Deuterated chloroform","Deuterated methanol","Hydrogen bond","Nuclear magnetic resonance","spectroscopy"],"articleSection":["crystal_structure_mining"],"inLanguage":"en-GB","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=17089#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=17089","url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=17089","name":"Hydrogen bonding to chloroform. - 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=17089#primaryimage"},"image":{"@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=17089#primaryimage"},"thumbnailUrl":"http:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2016\/11\/ClCHO-rt.jpg","datePublished":"2016-11-14T17:21:26+00:00","dateModified":"2016-12-03T10:18:26+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=17089#breadcrumb"},"inLanguage":"en-GB","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=17089"]}]},{"@type":"ImageObject","inLanguage":"en-GB","@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=17089#primaryimage","url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2016\/11\/ClCHO-rt.jpg","contentUrl":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2016\/11\/ClCHO-rt.jpg","width":725,"height":486},{"@type":"BreadcrumbList","@id":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=17089#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog"},{"@type":"ListItem","position":2,"name":"Hydrogen bonding to chloroform."}]},{"@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\/pDef7-4rD","jetpack-related-posts":[{"id":21472,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=21472","url_meta":{"origin":17089,"position":0},"title":"The Structure of Tetrodotoxin as a free base &#8211; with a better solvation model.","author":"Henry Rzepa","date":"November 26, 2019","format":false,"excerpt":"In the previous post, I discussed the structure of the free base form of tetrodotoxin, often represented as originally suggested by Woodward below in an ionic form: Quantum calculations suggested that this form was higher in energy than neutral forms devoid of the zwitterionic charge separation in a relatively non\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\/2019\/11\/zw3H2O-1024x770.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":18755,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=18755","url_meta":{"origin":17089,"position":1},"title":"One more WATOC 2017 Report.","author":"Henry Rzepa","date":"August 31, 2017","format":false,"excerpt":"Conferences can be intense, and this one is no exception. After five days, saturation is in danger of setting in. But before it does, I include two more (very) brief things I have learnt. Sason Shaik introduced a theme he first investigated years ago, but for which no experiment had\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":24045,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=24045","url_meta":{"origin":17089,"position":2},"title":"Another very large anomeric effect &#8211; with a twist.","author":"Henry Rzepa","date":"July 22, 2021","format":false,"excerpt":"In the earlier post on the topic of anomeric effects, I identified a number of outliers associated with large differences in the lengths of two carbon-oxygen bonds sharing a common carbon atom. Here is another of these outliers (MUZZIS) which shows equally unusual properties. This is an oxyanion (counterion is\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\/07\/MUZZIS-1024x698.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":25043,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=25043","url_meta":{"origin":17089,"position":3},"title":"Geometries of proton transfers: modelled using total energy or free energy?","author":"Henry Rzepa","date":"April 18, 2022","format":false,"excerpt":"Proton transfers are amongst the most common of all chemical reactions. They are often thought of as \"trivial\" and even may not feature in many mechanistic schemes, other than perhaps the notation \"PT\".\u00a0The types with the lowest energy barriers for transfer often involve heteroatoms such as N and O, and\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\/2022\/04\/plot-1024x734.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":21096,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=21096","url_meta":{"origin":17089,"position":4},"title":"CH&#8230;O hydrogen bonding competing with layered dispersion attractions.","author":"Henry Rzepa","date":"July 19, 2019","format":false,"excerpt":"I have previously looked at the topic of hydrogen bonding interactions from the hydrogen of chloroform Here I generalize\u00a0C-H...O interactions by conducting searches of the CSD (Cambridge structure database) as a function of the carbon hybridisation.\u00a0I am going to jump straight to a specific molecule XEVJIR (DOI: 10.5517\/cc5fgpq) identified from\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\/2019\/07\/XEVJIR-1024x839.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":5796,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=5796","url_meta":{"origin":17089,"position":5},"title":"Validating the chemical literature heritage. Eudesma-1,3-dien-6,13-olide.","author":"Henry Rzepa","date":"December 8, 2011","format":false,"excerpt":"Previously, I had noted that Corey\u00a0reported\u00a0in 1963\/65 the total synthesis of\u00a0the sesquiterpene dihydrocostunolide. Compound 16, known as\u00a0Eudesma-1,3-dien-6,13-olide was represented as shown below in black; the hydrogen shown in red was implicit in Corey's representation, as was its stereochemistry. As of this instant, this compound is just one of 64,688,893 molecules\u2026","rel":"","context":"In &quot;Chemical IT&quot;","block_context":{"text":"Chemical IT","link":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?cat=2"},"img":{"alt_text":"","src":"http:\/\/www.ch.imperial.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2011\/12\/p34a1.svg","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\/17089","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=17089"}],"version-history":[{"count":4,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=\/wp\/v2\/posts\/17089\/revisions"}],"predecessor-version":[{"id":17098,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=\/wp\/v2\/posts\/17089\/revisions\/17098"}],"wp:attachment":[{"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=17089"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17089"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17089"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fppma_author&post=17089"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}