The closo-Si12C12 molecule from cluster to crystal: Effects of hydrogenation and oligomerization on excited states
Excited state properties of chain and cyclic oligomers of closo-Si12C12 moieties are calculated using time-dependent density functional theory methods. Ultraviolet, visible, and near-infrared photo-absorption properties are described for oligomers that form by linking closo-Si12C12 monomer moieties...
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Veröffentlicht in: | The Journal of chemical physics 2017-06, Vol.146 (23), p.234302-234302 |
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creator | Duan, Xiaofeng F. Burggraf, Larry W. |
description | Excited state properties of chain and cyclic oligomers of closo-Si12C12 moieties are calculated using time-dependent density functional theory methods. Ultraviolet, visible, and near-infrared photo-absorption properties are described for oligomers that form by linking closo-Si12C12 monomer moieties through Si–Si bonds. Natural transition orbitals for electron and hole states of stationary-state excitons in oligomers were compared to understand how exciton states are influenced by oligomer structure. Depending on the structure, some prominent excited states have large electron-hole charge separation while others do not; some exhibit exciton delocalization while others do not. With increasing oligomer length, the character of the transition between silicon and carbon regions tends to be maintained. And the extent of exciton delocalization and charge separation for an excitation is strongly influenced by the number and types of Si–Si links between oligomer units. We find that cyclic quadramers have spectroscopy properties akin to those of J-aggregates, including the tendency to collapse oligomer excitation transition energies into a narrow single peak. Hydrogenation influences some excited state distributions and energies. Phase behaviors reveal electron state or hole state equivalence in certain molecules that are differently hydrogenated, illustrating the potential for near-resonant exciton transfer between adjacent donor and acceptor species. |
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Ultraviolet, visible, and near-infrared photo-absorption properties are described for oligomers that form by linking closo-Si12C12 monomer moieties through Si–Si bonds. Natural transition orbitals for electron and hole states of stationary-state excitons in oligomers were compared to understand how exciton states are influenced by oligomer structure. Depending on the structure, some prominent excited states have large electron-hole charge separation while others do not; some exhibit exciton delocalization while others do not. With increasing oligomer length, the character of the transition between silicon and carbon regions tends to be maintained. And the extent of exciton delocalization and charge separation for an excitation is strongly influenced by the number and types of Si–Si links between oligomer units. We find that cyclic quadramers have spectroscopy properties akin to those of J-aggregates, including the tendency to collapse oligomer excitation transition energies into a narrow single peak. Hydrogenation influences some excited state distributions and energies. Phase behaviors reveal electron state or hole state equivalence in certain molecules that are differently hydrogenated, illustrating the potential for near-resonant exciton transfer between adjacent donor and acceptor species.</description><identifier>ISSN: 0021-9606</identifier><identifier>EISSN: 1089-7690</identifier><identifier>DOI: 10.1063/1.4984063</identifier><identifier>CODEN: JCPSA6</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Cyclic oligomers ; Density functional theory ; Electrons ; Excitation ; Excitons ; Holes (electron deficiencies) ; Hydrogenation ; Near infrared radiation ; Oligomerization ; Oligomers ; Properties (attributes) ; Separation ; Silicon ; Time dependence</subject><ispartof>The Journal of chemical physics, 2017-06, Vol.146 (23), p.234302-234302</ispartof><rights>Author(s)</rights><rights>2017 Author(s). 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Ultraviolet, visible, and near-infrared photo-absorption properties are described for oligomers that form by linking closo-Si12C12 monomer moieties through Si–Si bonds. Natural transition orbitals for electron and hole states of stationary-state excitons in oligomers were compared to understand how exciton states are influenced by oligomer structure. Depending on the structure, some prominent excited states have large electron-hole charge separation while others do not; some exhibit exciton delocalization while others do not. With increasing oligomer length, the character of the transition between silicon and carbon regions tends to be maintained. And the extent of exciton delocalization and charge separation for an excitation is strongly influenced by the number and types of Si–Si links between oligomer units. We find that cyclic quadramers have spectroscopy properties akin to those of J-aggregates, including the tendency to collapse oligomer excitation transition energies into a narrow single peak. Hydrogenation influences some excited state distributions and energies. Phase behaviors reveal electron state or hole state equivalence in certain molecules that are differently hydrogenated, illustrating the potential for near-resonant exciton transfer between adjacent donor and acceptor species.</description><subject>Cyclic oligomers</subject><subject>Density functional theory</subject><subject>Electrons</subject><subject>Excitation</subject><subject>Excitons</subject><subject>Holes (electron deficiencies)</subject><subject>Hydrogenation</subject><subject>Near infrared radiation</subject><subject>Oligomerization</subject><subject>Oligomers</subject><subject>Properties (attributes)</subject><subject>Separation</subject><subject>Silicon</subject><subject>Time dependence</subject><issn>0021-9606</issn><issn>1089-7690</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNp9kE1PwzAMhiMEEmNw4B9E4gJIhTjp0oYbmviSJnEAzlWaOqxT24wklRi_nsB24oBsy1by2LJfQk6BXQGT4hquclXmqdojE2Clygqp2D6ZMMYhU5LJQ3IUwooxBgXPJ8S_LpGazgWXvbTA58Bp7zo0Y4fUetenvzFE9DQ6avwmRN3d0Dtr0cRAnaXLTePdOw46tm6gemio69p316Nvv7ZvyfHTtBEbmrojhmNyYHUX8GSXp-Tt_u51_pgtnh-e5reLzAg-i5kqG2W40ZgLXedlAdLWKGpWmKaYYdlIZWUjijIZ2Bkvc6E0zy2ztVUppJiS8-3ctXcfI4ZY9W0w2HV6QDeGChQIoUolftCzP-jKjX5I21UcQALkM4BEXWwp410IHm219m2v_aYCVv2oX0G1Uz-xl1s2pNN_hfgH_gYoWISX</recordid><startdate>20170621</startdate><enddate>20170621</enddate><creator>Duan, Xiaofeng F.</creator><creator>Burggraf, Larry W.</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>7X8</scope><orcidid>https://orcid.org/0000-0002-3227-2831</orcidid></search><sort><creationdate>20170621</creationdate><title>The closo-Si12C12 molecule from cluster to crystal: Effects of hydrogenation and oligomerization on excited states</title><author>Duan, Xiaofeng F. ; Burggraf, Larry W.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c325t-98d9c2cae43ab48716fbe3b07cd75e8d69f6d3787871f528439a24f0fbf9fbf63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Cyclic oligomers</topic><topic>Density functional theory</topic><topic>Electrons</topic><topic>Excitation</topic><topic>Excitons</topic><topic>Holes (electron deficiencies)</topic><topic>Hydrogenation</topic><topic>Near infrared radiation</topic><topic>Oligomerization</topic><topic>Oligomers</topic><topic>Properties (attributes)</topic><topic>Separation</topic><topic>Silicon</topic><topic>Time dependence</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Duan, Xiaofeng F.</creatorcontrib><creatorcontrib>Burggraf, Larry W.</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>MEDLINE - Academic</collection><jtitle>The Journal of chemical physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Duan, Xiaofeng F.</au><au>Burggraf, Larry W.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The closo-Si12C12 molecule from cluster to crystal: Effects of hydrogenation and oligomerization on excited states</atitle><jtitle>The Journal of chemical physics</jtitle><date>2017-06-21</date><risdate>2017</risdate><volume>146</volume><issue>23</issue><spage>234302</spage><epage>234302</epage><pages>234302-234302</pages><issn>0021-9606</issn><eissn>1089-7690</eissn><coden>JCPSA6</coden><abstract>Excited state properties of chain and cyclic oligomers of closo-Si12C12 moieties are calculated using time-dependent density functional theory methods. Ultraviolet, visible, and near-infrared photo-absorption properties are described for oligomers that form by linking closo-Si12C12 monomer moieties through Si–Si bonds. Natural transition orbitals for electron and hole states of stationary-state excitons in oligomers were compared to understand how exciton states are influenced by oligomer structure. Depending on the structure, some prominent excited states have large electron-hole charge separation while others do not; some exhibit exciton delocalization while others do not. With increasing oligomer length, the character of the transition between silicon and carbon regions tends to be maintained. And the extent of exciton delocalization and charge separation for an excitation is strongly influenced by the number and types of Si–Si links between oligomer units. We find that cyclic quadramers have spectroscopy properties akin to those of J-aggregates, including the tendency to collapse oligomer excitation transition energies into a narrow single peak. Hydrogenation influences some excited state distributions and energies. Phase behaviors reveal electron state or hole state equivalence in certain molecules that are differently hydrogenated, illustrating the potential for near-resonant exciton transfer between adjacent donor and acceptor species.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.4984063</doi><tpages>13</tpages><orcidid>https://orcid.org/0000-0002-3227-2831</orcidid></addata></record> |
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subjects | Cyclic oligomers Density functional theory Electrons Excitation Excitons Holes (electron deficiencies) Hydrogenation Near infrared radiation Oligomerization Oligomers Properties (attributes) Separation Silicon Time dependence |
title | The closo-Si12C12 molecule from cluster to crystal: Effects of hydrogenation and oligomerization on excited states |
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