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Sun Z, Zhao Y, Prior TJ, Elsegood MRJ, Wang K, Xing T, Redshaw C. Mono-oxo molybdenum(vi) and tungsten(vi) complexes bearing chelating aryloxides: synthesis, structure and ring opening polymerization of cyclic esters. Dalton Trans 2019; 48:1454-1466. [DOI: 10.1039/c8dt04566f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mono-oxo Mo and W complexes bearing di- or tetra-phenolates were active for the ROP of small cyclic esters, albeit with poor control. Related metallocalix[4]arenes were less active.
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Affiliation(s)
- Ziyue Sun
- College of Chemistry and Material Science
- Northwest University
- 710069 Xi'an
- China
| | - Yanxia Zhao
- College of Chemistry and Material Science
- Northwest University
- 710069 Xi'an
- China
| | | | | | - Kuiyuan Wang
- Department of Chemistry
- The University of Hull
- Hull
- UK
| | - Tian Xing
- Department of Chemistry
- The University of Hull
- Hull
- UK
| | - Carl Redshaw
- College of Chemistry and Material Science
- Northwest University
- 710069 Xi'an
- China
- Department of Chemistry
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Aronica C, Chastanet G, Zueva E, Borshch SA, Clemente-Juan JM, Luneau D. A Mixed-Valence Polyoxovanadate(III,IV) Cluster with a Calixarene Cap Exhibiting Ferromagnetic V(III)−V(IV) Interactions. J Am Chem Soc 2008; 130:2365-71. [DOI: 10.1021/ja078030q] [Citation(s) in RCA: 125] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Christophe Aronica
- Université Claude Bernard Lyon1, Laboratoire des Multimatériaux et Interfaces (UMR 5615), Campus de La Doua, 69622 Villeurbanne Cedex, France, Department of Inorganic Chemistry, Kazan State Technological University, 68 K. Marx Street, 420015 Kazan, Russia, Ecole Normale Supérieure de Lyon, Laboratoire de Chimie (UMR 5182), 46 allée d'Italie, 69364 Lyon Cedex 07, France, Instituto de Ciencia Molecular, Edificio de Institutos de Paterna, Universidad de Valencia, Apartado de correos 22085, 46071 Valencia,
| | - Guillaume Chastanet
- Université Claude Bernard Lyon1, Laboratoire des Multimatériaux et Interfaces (UMR 5615), Campus de La Doua, 69622 Villeurbanne Cedex, France, Department of Inorganic Chemistry, Kazan State Technological University, 68 K. Marx Street, 420015 Kazan, Russia, Ecole Normale Supérieure de Lyon, Laboratoire de Chimie (UMR 5182), 46 allée d'Italie, 69364 Lyon Cedex 07, France, Instituto de Ciencia Molecular, Edificio de Institutos de Paterna, Universidad de Valencia, Apartado de correos 22085, 46071 Valencia,
| | - Ekaterina Zueva
- Université Claude Bernard Lyon1, Laboratoire des Multimatériaux et Interfaces (UMR 5615), Campus de La Doua, 69622 Villeurbanne Cedex, France, Department of Inorganic Chemistry, Kazan State Technological University, 68 K. Marx Street, 420015 Kazan, Russia, Ecole Normale Supérieure de Lyon, Laboratoire de Chimie (UMR 5182), 46 allée d'Italie, 69364 Lyon Cedex 07, France, Instituto de Ciencia Molecular, Edificio de Institutos de Paterna, Universidad de Valencia, Apartado de correos 22085, 46071 Valencia,
| | - Serguei A. Borshch
- Université Claude Bernard Lyon1, Laboratoire des Multimatériaux et Interfaces (UMR 5615), Campus de La Doua, 69622 Villeurbanne Cedex, France, Department of Inorganic Chemistry, Kazan State Technological University, 68 K. Marx Street, 420015 Kazan, Russia, Ecole Normale Supérieure de Lyon, Laboratoire de Chimie (UMR 5182), 46 allée d'Italie, 69364 Lyon Cedex 07, France, Instituto de Ciencia Molecular, Edificio de Institutos de Paterna, Universidad de Valencia, Apartado de correos 22085, 46071 Valencia,
| | - Juan M. Clemente-Juan
- Université Claude Bernard Lyon1, Laboratoire des Multimatériaux et Interfaces (UMR 5615), Campus de La Doua, 69622 Villeurbanne Cedex, France, Department of Inorganic Chemistry, Kazan State Technological University, 68 K. Marx Street, 420015 Kazan, Russia, Ecole Normale Supérieure de Lyon, Laboratoire de Chimie (UMR 5182), 46 allée d'Italie, 69364 Lyon Cedex 07, France, Instituto de Ciencia Molecular, Edificio de Institutos de Paterna, Universidad de Valencia, Apartado de correos 22085, 46071 Valencia,
| | - Dominique Luneau
- Université Claude Bernard Lyon1, Laboratoire des Multimatériaux et Interfaces (UMR 5615), Campus de La Doua, 69622 Villeurbanne Cedex, France, Department of Inorganic Chemistry, Kazan State Technological University, 68 K. Marx Street, 420015 Kazan, Russia, Ecole Normale Supérieure de Lyon, Laboratoire de Chimie (UMR 5182), 46 allée d'Italie, 69364 Lyon Cedex 07, France, Instituto de Ciencia Molecular, Edificio de Institutos de Paterna, Universidad de Valencia, Apartado de correos 22085, 46071 Valencia,
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Notestein JM, Andrini LR, Kalchenko VI, Requejo FG, Katz A, Iglesia E. Structural Assessment and Catalytic Consequences of the Oxygen Coordination Environment in Grafted Ti−Calixarenes. J Am Chem Soc 2007; 129:1122-31. [PMID: 17263393 DOI: 10.1021/ja065830c] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Calixarene-Ti complexes were grafted onto SiO2 (0.18-0.24 Ti nm-2) to form isolated and accessible Ti centers persistently coordinated to multidentate calixarene ligands. Grafted Ti-tert-butylcalix[4]arenes gave Ti K-edge absorption spectra with pre-edge features at 4968.6-4968.9 eV, independently of Ti surface density and of their use in epoxidation catalysis. The structure and reactivity of grafted Ti-calix[4]arenes were weakly dependent on thermal treatment below 573 K, and the relative epoxidation rates of trans- and cis-alkenes showed that calixarene ligands did not restrict access to Ti centers more than corresponding calcined Ti-SiO2 materials. For all materials, 13C NMR and UV-visible spectroscopies confirmed the presence of Ti-O-Si connectivity and identical ligand-to-metal transitions. Grafted Ti-homooxacalix[3]arene complexes, however, gave weaker pre-edge features at higher energies ( approximately 4969.5 eV), consistent with greater Ti 3d occupancy and coordination numbers greater than four, and 20-fold lower cyclohexene epoxidation rate constants (per Ti) than on calix[4]arene-based materials. These different rates and near-edge spectra result from aldehyde formation caused by unimolecular cleavage of ether linkages in homooxacalix[3]arene ligands during grafting, leading to higher coordination and electron density at Ti centers. Materials based on tert-butylcalix[4]arene and homooxacalix[3]arenes led to similar epoxidation rates and near-edge spectra after calcination, consistent with the conversion of both materials to isolated Ti centers with identical structure. These materials provide a systematic approach for relating oxidation reactivity to Ti 3d occupancy, a descriptor of Lewis acid strength, and Ti coordination, because they provide Ti centers with varying electron density and coordination, but maintain accessible active centers with uniform structure and unrestricted access to reactants.
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Affiliation(s)
- Justin M Notestein
- Department of Chemical Engineering, University of California at Berkeley, Berkeley, California 94720, USA
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Liu L, Zakharov LN, Golen JA, Rheingold AL, Watson WH, Hanna TA. Molybdocalixarene Structure Control via Rim Deprotonation. Synthesis, Characterization, and Crystal Structures of Calix[4]arene Mo(VI) Monooxo Complexes and Calix[4]arene Alkali Metal/Mo(VI) Dioxo Complexes. Inorg Chem 2006; 45:4247-60. [PMID: 16676988 DOI: 10.1021/ic060404d] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report a series of calix[4]arene Mo(VI) dioxo complexes M2RC4MoO2 (M = alkali metal, R = H or Bu(t)) that were fully characterized by NMR, X-ray, IR, UV/vis, and elemental analysis. Molybdocalix[4]arene structures can be controlled via lower rim deprotonation, groups at para positions of calix[4]arene, and alkali metal counterions. Mono deprotonation at the lower rim leads to calix[4]arene Mo(VI) monooxo complexes RC4MoO (R = H, Bu(t), or allyl), and full deprotonation gives rise to calix[4]arene Mo(VI) dioxo complexes. Structural studies indicate that HC4 Mo(VI) dioxo complexes easily form polymeric structures via cation-pi interaction and coordination between different calixarene units. However, Bu(t)C4 Mo(VI) dioxo complexes tend to form dimers or tetramers due to steric hindrance of the tert-butyl groups at para positions in calixarene. The structures of the reduced side products A and C were determined by X-ray diffraction studies. The mechanism of RC4MoO formation from the reaction of calixarene monoanions with MoO2Cl2 appears to include the addition of a calixarene -OH group across a Mo=O bond.
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Affiliation(s)
- Lihua Liu
- Department of Chemistry, Texas Christian University, P.O. Box 298860, Fort Worth, Texas 76129, USA
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