{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,6]],"date-time":"2026-09-06T04:44:51Z","timestamp":1788669891957,"version":"build-2803163510"},"reference-count":69,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2020,8,16]],"date-time":"2020-08-16T00:00:00Z","timestamp":1597536000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000928","name":"Welch Foundation","doi-asserted-by":"publisher","award":["Y 1289"],"award-info":[{"award-number":["Y 1289"]}],"id":[{"id":"10.13039\/100000928","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Mercury(II) complexes (Me-maloNHCDipp)HgCl (1b), (t-Bu-maloNHCDipp)HgCl (2b) and (t-Bu-maloNHCDipp)HgMe (2c) supported by anionic N-heterocyclic carbenes have been obtained in good yields from the reaction of the potassium salt of N-heterocyclic carbene ligand precursors and mercury(II) salts, HgCl2 and MeHgI. These molecules have been characterized by 1H-NMR, 13C-NMR and IR spectroscopy and elemental analysis. X-ray crystal structures of 1b and 2b are also presented. Interestingly, complex 1b is polymeric {(Me-maloNHCDipp)HgCl}n in the solid state, as a result of inter-molecular Hg-O contacts, and features rare three coordinate mercury sites with a T-shaped arrangement, whereas the (t-Bu-maloNHCDipp)HgCl (2b) is monomeric and has a linear, two-coordinate mercury center. The formation of T-shaped structure and the aggregation of complex 1b is attributable to the reduced steric demand of the N-heterocyclic carbene ligand backbone substituent.<\/jats:p>","DOI":"10.3390\/molecules25163741","type":"journal-article","created":{"date-parts":[[2020,8,17]],"date-time":"2020-08-17T06:33:20Z","timestamp":1597646000000},"page":"3741","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Mercury(II) Complexes of Anionic N-Heterocyclic Carbene Ligands: Steric Effects of the Backbone Substituent"],"prefix":"10.3390","volume":"25","author":[{"given":"Chandrakanta","family":"Dash","sequence":"first","affiliation":[{"name":"Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX 76019, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Animesh","family":"Das","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX 76019, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H. V. Rasika","family":"Dias","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX 76019, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2020,8,16]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"485","DOI":"10.1038\/nature13384","article-title":"An overview of N-heterocyclic carbenes","volume":"510","author":"Hopkinson","year":"2014","journal-title":"Nature"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"3612","DOI":"10.1021\/cr900074m","article-title":"N-Heterocyclic carbenes in late transition metal catalysis","volume":"109","author":"Marion","year":"2009","journal-title":"Chem. 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