{"id":55,"date":"2023-11-04T20:22:40","date_gmt":"2023-11-04T20:22:40","guid":{"rendered":"https:\/\/www-cxcp1.tifrh.res.in\/~vipin\/?page_id=55"},"modified":"2023-11-04T20:22:40","modified_gmt":"2023-11-04T20:22:40","slug":"1h-1h-mq-spectroscopy","status":"publish","type":"page","link":"https:\/\/www.tifrh.res.in\/~vipin\/1h-1h-mq-spectroscopy\/","title":{"rendered":"1H-1H MQ spectroscopy"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.23&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;5px|||||&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_row _builder_version=&#8221;4.23&#8243; _module_preset=&#8221;default&#8221; border_width_bottom=&#8221;1px&#8221; border_color_bottom=&#8221;#e2e2e2&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.23&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_post_title meta=&#8221;off&#8221; featured_image=&#8221;off&#8221; _builder_version=&#8221;4.23&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_post_title][\/et_pb_column][\/et_pb_row][et_pb_row use_custom_gutter=&#8221;on&#8221; gutter_width=&#8221;2&#8243; _builder_version=&#8221;4.23&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.23&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.23&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;0px|||||&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; sticky_enabled=&#8221;0&#8243;]<\/p>\n<div class=\"manu-pagecontent-wrap\">\n<div class=\"entry-content\">\n<p style=\"text-align: justify;\"><span lang=\"EN-US\">SQ NMR spectroscopy is the basis of modern spectral characterization. However, MQ provides access to unique structural details by correlating coupled spins. MQ spectroscopy simplifies spectra and unique correlations provide structural information. MQ spectroscopy has been extensively used to suppress background signal, measure torsional angles, study dynamics and in spectral assignment. \u00a0However in case of unlabeled protonated samples MQ coherences have played a unique role. \u00a0At fast MAS, MQ spectra suffer from t1 noise arising from various factors. We have been developing DQ-SQ and TQ-SQ 1H-1H correlation experiments that result in higher MQ excitation and filtering efficiency. These sequences are not gamma dependent. In case of 1H TQ, the sensitivity of the gamma-free sequences is a factor of 3-4 higher than previously know TQ recoupling sequences and are largely free from t1 artifacts arising due to rotor fluctuations.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span lang=\"EN-US\">This is collaboration with Dr Yusuke Nishiyama and Prof. Rongchun Zhang.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span lang=\"EN-US\"><\/span><\/p>\n<p style=\"text-align: justify;\"><strong>References<\/strong><\/p>\n<p style=\"text-align: justify;\">\n<ul>\n<li style=\"text-align: justify;\"><span lang=\"EN-US\">Yusuke Nishiyama,\u00a0<strong>Vipin Agarwal<\/strong> and\u00a0Rongchun Zhang\u00a0<\/span><a href=\"https:\/\/doi.org\/10.1016\/j.ssnmr.2021.101734\">Efficient Symmetry-Based \u03b3-Encoded DQ Recoupling Sequences for Suppression of t1-Noise in Solid-State NMR Spectroscopy at Fast MAS<\/a>\u00a0<em><strong>Solid State Nucl. Magn. Reson., 114, 101734<\/strong><strong>\u00a0(2021)<\/strong><\/em><\/li>\n<li style=\"text-align: justify;\">Yusuke Nishiyama, <strong>Vipin<\/strong> <strong>Agarwal<\/strong>\u00a0<strong><u>\u00a0<\/u><\/strong>and Rongchun Zhang\u00a0<a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/acs.jpcc.0c08828\"><em>t<\/em><em><sub>1<\/sub><\/em><em>-noise suppression by \u03b3-free recoupling sequences in solid-state NMR for structural characterization of fully protonated molecules <\/em><\/a><em>at fast MAS <strong>\u00a0<span class=\"cit-title\"><i>J. Phys. Chem. C,<\/i><\/span>\u00a0<span class=\"cit-volume\">\u00a0124<\/span><span class=\"cit-issue\">, 48<\/span><span class=\"cit-pageRange\">, 26332\u201326343 (<span class=\"cit-year-info\">2020<\/span>)<\/span><\/strong><\/em><\/li>\n<\/ul>\n<\/div>\n<\/div>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>SQ NMR spectroscopy is the basis of modern spectral characterization. However, MQ provides access to unique structural details by correlating coupled spins. MQ spectroscopy simplifies spectra and unique correlations provide structural information. MQ spectroscopy has been extensively used to suppress background signal, measure torsional angles, study dynamics and in spectral assignment. \u00a0However in case of [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"class_list":["post-55","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.tifrh.res.in\/~vipin\/wp-json\/wp\/v2\/pages\/55"}],"collection":[{"href":"https:\/\/www.tifrh.res.in\/~vipin\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.tifrh.res.in\/~vipin\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.tifrh.res.in\/~vipin\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tifrh.res.in\/~vipin\/wp-json\/wp\/v2\/comments?post=55"}],"version-history":[{"count":2,"href":"https:\/\/www.tifrh.res.in\/~vipin\/wp-json\/wp\/v2\/pages\/55\/revisions"}],"predecessor-version":[{"id":58,"href":"https:\/\/www.tifrh.res.in\/~vipin\/wp-json\/wp\/v2\/pages\/55\/revisions\/58"}],"wp:attachment":[{"href":"https:\/\/www.tifrh.res.in\/~vipin\/wp-json\/wp\/v2\/media?parent=55"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}