Effect of concentration of the diazoalcene molybdenum complex immobilized in ureasil matrix
Autor(a) principal: | |
---|---|
Data de Publicação: | 2004 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/1822/5723 |
Resumo: | The complex trans-[FMo(NNCHCHCHCH2CH3)(Ph2PCH2CH2PPh2)2][BPh4], was dispersed in a hybrid matrix synthesized by a sol-gel process. The host matrix of the so-called ureasil is a network of silica to which oligopolyoxyethylene chains [POE, (OCH2CH2)n] are grafted by means of urea cross-links. The free complex and sol-gel materials were characterized by thermal analysis (DSC), surface analysis (XPS) and spectroscopic methods (FT-IR and UV/Vis). The data gathered indicates that the molybdenum(IV) complex is immobilized in the host matrix, and it exhibits structural properties different from those of the free form. These differences could arise either from distortions caused by steric effects imposed by the structure of hybrid matrix or by interactions with the matrix. These materials shows potential applications in heterogeneous catalysis in mild conditions. |
id |
RCAP_d69eea57140481d1a1bfaffb438777c2 |
---|---|
oai_identifier_str |
oai:repositorium.sdum.uminho.pt:1822/5723 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
spelling |
Effect of concentration of the diazoalcene molybdenum complex immobilized in ureasil matrixMolydenum (IV) complexDiazoalceneSol-gelComplex immobilizationHost-guestmolybdenum(IV) complexScience & TechnologyThe complex trans-[FMo(NNCHCHCHCH2CH3)(Ph2PCH2CH2PPh2)2][BPh4], was dispersed in a hybrid matrix synthesized by a sol-gel process. The host matrix of the so-called ureasil is a network of silica to which oligopolyoxyethylene chains [POE, (OCH2CH2)n] are grafted by means of urea cross-links. The free complex and sol-gel materials were characterized by thermal analysis (DSC), surface analysis (XPS) and spectroscopic methods (FT-IR and UV/Vis). The data gathered indicates that the molybdenum(IV) complex is immobilized in the host matrix, and it exhibits structural properties different from those of the free form. These differences could arise either from distortions caused by steric effects imposed by the structure of hybrid matrix or by interactions with the matrix. These materials shows potential applications in heterogeneous catalysis in mild conditions.KluwerUniversidade do MinhoCosta, F.Fonseca, A. Maurício C.Silva, Carlos J. R.Neves, Isabel C.2004-122004-12-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/5723eng"Journal of sol-gel science and technology". ISSN 0928-0707. 32:1-3 (Dec. 2004) 353-356.0928-070710.1007/s10971-004-5816-2www.springerlink.cominfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:27:11Zoai:repositorium.sdum.uminho.pt:1822/5723Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:21:43.419230Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Effect of concentration of the diazoalcene molybdenum complex immobilized in ureasil matrix |
title |
Effect of concentration of the diazoalcene molybdenum complex immobilized in ureasil matrix |
spellingShingle |
Effect of concentration of the diazoalcene molybdenum complex immobilized in ureasil matrix Costa, F. Molydenum (IV) complex Diazoalcene Sol-gel Complex immobilization Host-guest molybdenum(IV) complex Science & Technology |
title_short |
Effect of concentration of the diazoalcene molybdenum complex immobilized in ureasil matrix |
title_full |
Effect of concentration of the diazoalcene molybdenum complex immobilized in ureasil matrix |
title_fullStr |
Effect of concentration of the diazoalcene molybdenum complex immobilized in ureasil matrix |
title_full_unstemmed |
Effect of concentration of the diazoalcene molybdenum complex immobilized in ureasil matrix |
title_sort |
Effect of concentration of the diazoalcene molybdenum complex immobilized in ureasil matrix |
author |
Costa, F. |
author_facet |
Costa, F. Fonseca, A. Maurício C. Silva, Carlos J. R. Neves, Isabel C. |
author_role |
author |
author2 |
Fonseca, A. Maurício C. Silva, Carlos J. R. Neves, Isabel C. |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Costa, F. Fonseca, A. Maurício C. Silva, Carlos J. R. Neves, Isabel C. |
dc.subject.por.fl_str_mv |
Molydenum (IV) complex Diazoalcene Sol-gel Complex immobilization Host-guest molybdenum(IV) complex Science & Technology |
topic |
Molydenum (IV) complex Diazoalcene Sol-gel Complex immobilization Host-guest molybdenum(IV) complex Science & Technology |
description |
The complex trans-[FMo(NNCHCHCHCH2CH3)(Ph2PCH2CH2PPh2)2][BPh4], was dispersed in a hybrid matrix synthesized by a sol-gel process. The host matrix of the so-called ureasil is a network of silica to which oligopolyoxyethylene chains [POE, (OCH2CH2)n] are grafted by means of urea cross-links. The free complex and sol-gel materials were characterized by thermal analysis (DSC), surface analysis (XPS) and spectroscopic methods (FT-IR and UV/Vis). The data gathered indicates that the molybdenum(IV) complex is immobilized in the host matrix, and it exhibits structural properties different from those of the free form. These differences could arise either from distortions caused by steric effects imposed by the structure of hybrid matrix or by interactions with the matrix. These materials shows potential applications in heterogeneous catalysis in mild conditions. |
publishDate |
2004 |
dc.date.none.fl_str_mv |
2004-12 2004-12-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/1822/5723 |
url |
http://hdl.handle.net/1822/5723 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
"Journal of sol-gel science and technology". ISSN 0928-0707. 32:1-3 (Dec. 2004) 353-356. 0928-0707 10.1007/s10971-004-5816-2 www.springerlink.com |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Kluwer |
publisher.none.fl_str_mv |
Kluwer |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
_version_ |
1799132684387090432 |