Star-Shaped Mesogens of Triazine-Based Dendrons and Dendrimers as Unconventional Columnar Liquid Crystals
Dendrons G n -Cl and G n -NH (n = 2−4) and novel dendrimers G n -N∼N-G n (n = 2−4) based on triazine and piperazine units were efficiently prepared in good yields without employing the protection and deprotection processes and are fully characterized by 1H NMR and 13C NMR spectroscopies, elemental a...
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| Veröffentlicht in: | Journal of organic chemistry 2008-01, Vol.73 (2), p.485-490 |
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| container_end_page | 490 |
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| container_issue | 2 |
| container_start_page | 485 |
| container_title | Journal of organic chemistry |
| container_volume | 73 |
| creator | Lai, Long-Li Lee, Cheng-Hua Wang, Ling-Yung Cheng, Kung-Lung Hsu, Hsiu-Fu |
| description | Dendrons G n -Cl and G n -NH (n = 2−4) and novel dendrimers G n -N∼N-G n (n = 2−4) based on triazine and piperazine units were efficiently prepared in good yields without employing the protection and deprotection processes and are fully characterized by 1H NMR and 13C NMR spectroscopies, elemental analysis, and mass spectroscopy. These compounds are transparent and possess good thermal stability. G 4 -Cl shows a monotropic columnar phase in a narrow range with a coexisting crystalline phase. Dendron G 4 -NH shows a rectangular column-phase, and dendrimer G 4 -N∼N-G 4 exhibits a monotropic hexagonal columnar phase. These identifications were supported by the polarizing optical scope and powder XRD studies. |
| doi_str_mv | 10.1021/jo701990w |
| format | Article |
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These compounds are transparent and possess good thermal stability. G 4 -Cl shows a monotropic columnar phase in a narrow range with a coexisting crystalline phase. Dendron G 4 -NH shows a rectangular column-phase, and dendrimer G 4 -N∼N-G 4 exhibits a monotropic hexagonal columnar phase. 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Org. Chem</addtitle><description>Dendrons G n -Cl and G n -NH (n = 2−4) and novel dendrimers G n -N∼N-G n (n = 2−4) based on triazine and piperazine units were efficiently prepared in good yields without employing the protection and deprotection processes and are fully characterized by 1H NMR and 13C NMR spectroscopies, elemental analysis, and mass spectroscopy. These compounds are transparent and possess good thermal stability. G 4 -Cl shows a monotropic columnar phase in a narrow range with a coexisting crystalline phase. Dendron G 4 -NH shows a rectangular column-phase, and dendrimer G 4 -N∼N-G 4 exhibits a monotropic hexagonal columnar phase. These identifications were supported by the polarizing optical scope and powder XRD studies.</description><subject>Chemistry</subject><subject>Exact sciences and technology</subject><subject>Heterocyclic compounds</subject><subject>Heterocyclic compounds with several n hetero atoms in the same ring, in separated rings or in fused rings</subject><subject>Organic chemistry</subject><subject>Preparations and properties</subject><issn>0022-3263</issn><issn>1520-6904</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><recordid>eNptkE1v1DAQhi1ERZeFA38A5QISh4A_4sQ-Qvho1UWg7parNes44JK1t54EKL8eVxt1L_gyGr2PXo0fQp4x-ppRzt5cx4YyrenvB2TBJKdlrWn1kCwo5bwUvBan5DHiNc1PSvmInDLFZCUkXRC_HiGV6x-wd13x2WH87gIWsS82ycNfH1z5DjBH713oUswRhHnxO5fyisVVsDH8cmH0McBQtHGYdgFSsfI3k--KNt3iCAM-ISd9Hu7pPJfk6uOHTXtWrr58Om_frkoQio2lsA2jSnCtnLJOiboCVldcaFt3cmsrJupGMrBcas76jlV0a1VvnYC6ryzfiiV5eejdp3gzORzNzqN1wwDBxQnNnaqmyY1L8uoA2hQRk-vNPn8K0q1h1Nx5NfdeM_t8Lp22O9cdyVlkBl7MAKCFoU8QrMcjp7WuqFKZKw-cx9H9uc8h_TR1IxppNl_X5pK3l61WF-bbsRcs5numlBXjfw78B1U3m0k</recordid><startdate>20080118</startdate><enddate>20080118</enddate><creator>Lai, Long-Li</creator><creator>Lee, Cheng-Hua</creator><creator>Wang, Ling-Yung</creator><creator>Cheng, Kung-Lung</creator><creator>Hsu, Hsiu-Fu</creator><general>American Chemical Society</general><scope>BSCLL</scope><scope>IQODW</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20080118</creationdate><title>Star-Shaped Mesogens of Triazine-Based Dendrons and Dendrimers as Unconventional Columnar Liquid Crystals</title><author>Lai, Long-Li ; Lee, Cheng-Hua ; Wang, Ling-Yung ; Cheng, Kung-Lung ; Hsu, Hsiu-Fu</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a381t-3c71083298e8ce8364a164239c6d5bc4136751ac25921fd140bc8fce3a6f4c2b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>Chemistry</topic><topic>Exact sciences and technology</topic><topic>Heterocyclic compounds</topic><topic>Heterocyclic compounds with several n hetero atoms in the same ring, in separated rings or in fused rings</topic><topic>Organic chemistry</topic><topic>Preparations and properties</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Lai, Long-Li</creatorcontrib><creatorcontrib>Lee, Cheng-Hua</creatorcontrib><creatorcontrib>Wang, Ling-Yung</creatorcontrib><creatorcontrib>Cheng, Kung-Lung</creatorcontrib><creatorcontrib>Hsu, Hsiu-Fu</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Journal of organic chemistry</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lai, Long-Li</au><au>Lee, Cheng-Hua</au><au>Wang, Ling-Yung</au><au>Cheng, Kung-Lung</au><au>Hsu, Hsiu-Fu</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Star-Shaped Mesogens of Triazine-Based Dendrons and Dendrimers as Unconventional Columnar Liquid Crystals</atitle><jtitle>Journal of organic chemistry</jtitle><addtitle>J. Org. Chem</addtitle><date>2008-01-18</date><risdate>2008</risdate><volume>73</volume><issue>2</issue><spage>485</spage><epage>490</epage><pages>485-490</pages><issn>0022-3263</issn><eissn>1520-6904</eissn><coden>JOCEAH</coden><abstract>Dendrons G n -Cl and G n -NH (n = 2−4) and novel dendrimers G n -N∼N-G n (n = 2−4) based on triazine and piperazine units were efficiently prepared in good yields without employing the protection and deprotection processes and are fully characterized by 1H NMR and 13C NMR spectroscopies, elemental analysis, and mass spectroscopy. These compounds are transparent and possess good thermal stability. G 4 -Cl shows a monotropic columnar phase in a narrow range with a coexisting crystalline phase. Dendron G 4 -NH shows a rectangular column-phase, and dendrimer G 4 -N∼N-G 4 exhibits a monotropic hexagonal columnar phase. These identifications were supported by the polarizing optical scope and powder XRD studies.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>18154350</pmid><doi>10.1021/jo701990w</doi><tpages>6</tpages></addata></record> |
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| ispartof | Journal of organic chemistry, 2008-01, Vol.73 (2), p.485-490 |
| issn | 0022-3263 1520-6904 |
| language | eng |
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| source | ACS Publications |
| subjects | Chemistry Exact sciences and technology Heterocyclic compounds Heterocyclic compounds with several n hetero atoms in the same ring, in separated rings or in fused rings Organic chemistry Preparations and properties |
| title | Star-Shaped Mesogens of Triazine-Based Dendrons and Dendrimers as Unconventional Columnar Liquid Crystals |
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