{"id":24928,"date":"2022-03-24T06:44:08","date_gmt":"2022-03-24T06:44:08","guid":{"rendered":"https:\/\/www.ch.imperial.ac.uk\/rzepa\/blog\/?p=24928"},"modified":"2022-03-26T10:52:20","modified_gmt":"2022-03-26T10:52:20","slug":"sir-geoffrey-wilkinson-an-anniversary-celebration-23-march-2022-burlington-house-london","status":"publish","type":"post","link":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=24928","title":{"rendered":"Sir Geoffrey Wilkinson: An anniversary celebration. 23 March, 2022, Burlington House, London."},"content":{"rendered":"<div class=\"kcite-section\" kcite-section-id=\"24928\">\n<p>The meeting covered the scientific life of Professor Sir Geoffrey Wilkinson from the perspective of collaborators, friends and family and celebrated three anniversaries, the centenary of his birth (2021), the half-century anniversary of the Nobel prize (2023) and 70 years almost to the day (1 April) since the publication of the seminal article on Ferrocene (2022).<span id=\"cite_ITEM-24928-0\" name=\"citation\"><a href=\"#ITEM-24928-0\">[1]<\/a><\/span><\/p>\n<p><a href=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/Final-Wilkinson-program.pdf\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-24931\" src=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/Screenshot-1099-772x1024.jpg\" alt=\"\" width=\"450\" height=\"597\" srcset=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/Screenshot-1099-772x1024.jpg 772w, https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/Screenshot-1099-226x300.jpg 226w, https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/Screenshot-1099-768x1018.jpg 768w, https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/Screenshot-1099.jpg 1104w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<hr \/>\n<p>The meeting was organised as &#8220;inverse hybrid&#8221; (to use the new terminology), with a maximum capacity in-person audience attending along with fourteen speakers, three of whom were remote and one who could not attend on the day but whose presentation was given on their behalf. I will not give abstracts for the talks here, but note two common themes that I thought emerged during the day.<\/p>\n<ol>\n<li>All the speakers found themes in either their memories of Wilkinson and their time in his laboratories or their current research work that show how he continues to \u00a0influence, along with the famous text book that he co-wrote, the modern world of chemistry. He truly left a remarkable legacy.<\/li>\n<li>This is a personal observation, but in his day, Wilkinson was famously sceptical of the ability of molecular modelling to cast profound insights into the molecules his group were studying. Yesterday I think with only one or two exceptions, the talks were accompanied by &#8220;DFT modelling&#8221; helping to provide such insights, either into the reaction mechanisms via energy profiles or into the properties of the molecules themselves, including their spectroscopy.<\/li>\n<\/ol>\n<p>A small exhibition of artefacts included his famous portrait, all the editions of the text book and other items from his desk.<\/p>\n\n\t\t<style type=\"text\/css\">\n\t\t\t#gallery-1 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 33%;\n\t\t\t}\n\t\t\t#gallery-1 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-1' class='gallery galleryid-24928 gallery-columns-3 gallery-size-thumbnail'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?attachment_id=24942'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/IMG_0681-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?attachment_id=24941'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/IMG_0683-150x150.jpeg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?attachment_id=24940'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/IMG_0684-150x150.jpeg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?attachment_id=24939'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/IMG_0688-150x150.jpeg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?attachment_id=24938'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/IMG_0690-150x150.jpeg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?attachment_id=24937'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/IMG_0689-150x150.jpeg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?attachment_id=24936'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/IMG_0687-150x150.jpeg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?attachment_id=24935'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/IMG_0685-150x150.jpeg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?attachment_id=24934'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/IMG_0691-150x150.jpeg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><br style=\"clear: both\" \/>\n\t\t<\/div>\n\n<p>Finally, I thought I might explore the famous controversy surrounding the model of ferrocene which is shown in the photos below. It is shown with the two cyclopentadienyl rings in a so-called &#8220;eclipsed&#8221; conformation. To cast light on this, I show a search of the Cambridge crystal database of all molecules with this sub-structure. There are 24,868 of them.<a href=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/IMG_0682.jpeg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-24933\" src=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/IMG_0682-768x1024.jpeg\" alt=\"\" width=\"450\" height=\"600\" srcset=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/IMG_0682-768x1024.jpeg 768w, https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/IMG_0682-225x300.jpeg 225w, https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/IMG_0682.jpeg 960w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>The histogram plot of the dihedral angle is shown below. The staggered geometry has a dihedral of 36\u00b0 and you can see a small maximum at this point in the distribution below. But this is dwarfed by 0\u00b0, the value for the eclipsed orientation. The \u00a0barrier \u00a0to \u00a0rotation\u00a0is\u00a0 known\u00a0to\u00a0be very small, and this is reflected in the almost continuous distribution amongst those 24,868 molecules.<\/p>\n<p><a href=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/exclipsed.jpg\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-24945\" src=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/exclipsed.jpg\" alt=\"\" width=\"500\" srcset=\"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/exclipsed.jpg 834w, https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/exclipsed-300x95.jpg 300w, https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2022\/03\/exclipsed-768x242.jpg 768w\" sizes=\"(max-width: 834px) 100vw, 834px\" \/><\/a><\/p>\n<h2>References<\/h2>\n    <ol class=\"kcite-bibliography csl-bib-body\"><li id=\"ITEM-24928-0\">G. Wilkinson, M. Rosenblum, M.C. Whiting, and R.B. Woodward, \"THE STRUCTURE OF IRON BIS-CYCLOPENTADIENYL\", <i>Journal of the American Chemical Society<\/i>, vol. 74, pp. 2125-2126, 1952. <a href=\"https:\/\/doi.org\/10.1021\/ja01128a527\">https:\/\/doi.org\/10.1021\/ja01128a527<\/a>\n\n<\/li>\n<\/ol>\n\n<\/div> <!-- kcite-section 24928 -->","protected":false},"excerpt":{"rendered":"<p>The meeting covered the scientific life of Professor Sir Geoffrey Wilkinson from the perspective of collaborators, friends and family and celebrated three anniversaries, the centenary of his birth (2021), the half-century anniversary of the Nobel prize (2023) and 70 years almost to the day (1 April) since the publication of the seminal article on Ferrocene [&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":[565,4],"tags":[],"ppma_author":[2661],"class_list":["post-24928","post","type-post","status-publish","format-standard","hentry","category-historical","category-interesting-chemistry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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Part 1: Model templates","author":"Henry Rzepa","date":"January 21, 2024","format":false,"excerpt":"Geoffrey Wilkinson first reported his famous work on the hydrogenation catalyst that now bears his name in 1965 and I met him at Imperial College around 1969 and again when I returned there in 1977. He was still working on these catalysts then and I was privileged to collaborate with\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":3908,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=3908","url_meta":{"origin":24928,"position":1},"title":"Ferrocene","author":"Henry Rzepa","date":"April 17, 2011","format":false,"excerpt":"The structure of ferrocene was famously analysed by Woodward and Wilkinson in 1952,, symmetrically straddled in history by Pauling (1951) and Watson and Crick (1953). Quite a trio of Nobel-prize winning molecular structural analyses, all based on a large dose of intuition. The structures of both proteins and DNA succumbed\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.imperial.ac.uk\/rzepa\/blog\/wp-content\/uploads\/2011\/04\/ferrocene-aim.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":26812,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=26812","url_meta":{"origin":24928,"position":2},"title":"Mechanistic templates computed for the Grubbs alkene-metathesis reaction.","author":"Henry Rzepa","date":"February 19, 2024","format":false,"excerpt":"Following on from my template exploration of the Wilkinson hydrogenation catalyst, I now repeat this for the Grubbs variant of the Alkene metathesis reaction. As with the Wilkinson, here I focus on the stereochemistry of the mechanism as first suggested by Chauvin, an aspect lacking in eg the Wikipedia entry.\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":28761,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=28761","url_meta":{"origin":24928,"position":3},"title":"Forty (one) years on &#8211; The pico-mac-nano and Chemdraw.","author":"Henry Rzepa","date":"June 1, 2025","format":false,"excerpt":"Last year I reminisced on the occasion of the 40th Anniversary of the Macintosh computer. Four decades of advances in technology now mean I can do a fair amount of computational quantum modelling on a recent Mac (one from 2022 with M1 processor), and since then they have only got\u2026","rel":"","context":"In &quot;Historical&quot;","block_context":{"text":"Historical","link":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?cat=565"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":27114,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=27114","url_meta":{"origin":24928,"position":4},"title":"The 100th Anniversary year of Curly Arrows.","author":"Henry Rzepa","date":"June 14, 2024","format":false,"excerpt":"Chemists now use the term \"curly arrows\" as a language to describe the electronic rearrangements that occur when a (predominately organic) molecule transforms to another - the so called chemical reaction. It is also used to infer, via valence bond or resonance theory, what the mechanistic implications of that reaction\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":14224,"url":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?p=14224","url_meta":{"origin":24928,"position":5},"title":"The 2015 Bradley-Mason prize for open chemistry.","author":"Henry Rzepa","date":"June 26, 2015","format":false,"excerpt":"Open principles in the sciences in general and chemistry in particular are increasingly nowadays preached from funding councils down, but it can be more of a challenge to find innovative\u00a0practitioners. Part of the problem perhaps is that many of the current reward systems for scientists do not always help promote\u2026","rel":"","context":"In &quot;Bradley-Mason Prize for Open Chemistry&quot;","block_context":{"text":"Bradley-Mason Prize for Open Chemistry","link":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/?cat=2131"},"img":{"alt_text":"","src":"","width":0,"height":0},"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\/24928","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=24928"}],"version-history":[{"count":9,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=\/wp\/v2\/posts\/24928\/revisions"}],"predecessor-version":[{"id":24950,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=\/wp\/v2\/posts\/24928\/revisions\/24950"}],"wp:attachment":[{"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=24928"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24928"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24928"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.ch.ic.ac.uk\/rzepa\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fppma_author&post=24928"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}