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Institution

Polytechnic University of Valencia

EducationValencia, Spain
About: Polytechnic University of Valencia is a education organization based out in Valencia, Spain. It is known for research contribution in the topics: Catalysis & Population. The organization has 16282 authors who have published 40162 publications receiving 850234 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, the authors present the current evidence in support of considering some MOFs as semiconductors, including the synthesis of semiconducting MOFs by design and development of applications.
Abstract: The aim of the present feature article is to present the current evidence in support of considering some MOFs as semiconductors. While MOFs and zeolites share common structural properties derived from the microporous crystal structure, zeolites are insulating materials and most of the attempts to exploit them in optoelectronics have met with failure. In contrast, some MOFs may have interesting photochemical properties that derive from the fundamental event of charge separation in electrons and holes upon light absorption. Photoinduced charge separation is the hallmark of a semiconductor that can behave simultaneously as an oxidizing or reducing agent. Considering the novelty of this field, most of the available data about MOFs as semiconductor have been obtained from MOF-5, a case that is complicated due to its low structural stability. Therefore, we point out that further studies showing the semiconducting properties of other MOFs are still welcome. The purpose of this feature article is to trigger intense research in this area including the synthesis of semiconducting MOFs by design and development of applications.

429 citations

Journal ArticleDOI
TL;DR: The investigated system is a unique example of an artificial linear nanomotor that behaves as an autonomous linear motor and operates with a quantum efficiency up to ≈12% and works in mild environmental conditions.
Abstract: Light excitation powers the reversible shuttling movement of the ring component of a rotaxane between two stations located at a 1.3-nm distance on its dumbbell-shaped component. The photoinduced shuttling movement, which occurs in solution, is based on a “four-stroke” synchronized sequence of electronic and nuclear processes. At room temperature the deactivation time of the high-energy charge-transfer state obtained by light excitation is ≈10 μs, and the time period required for the ring-displacement process is on the order of 100 μs. The rotaxane behaves as an autonomous linear motor and operates with a quantum efficiency up to ≈12%. The investigated system is a unique example of an artificial linear nanomotor because it gathers together the following features: (i) it is powered by visible light (e.g., sunlight); (ii) it exhibits autonomous behavior, like motor proteins; (iii) it does not generate waste products; (iv) its operation can rely only on intramolecular processes, allowing in principle operation at the single-molecule level; (v) it can be driven at a frequency of 1 kHz; (vi) it works in mild environmental conditions (i.e., fluid solution at ambient temperature); and (vii) it is stable for at least 103 cycles.

426 citations

Journal ArticleDOI
TL;DR: An attempt has been made to rationalize the synthesis of extra-large-pore zeolites in terms of the synthesis mechanism, the directing effect of the organic structure directing agent (OSDA), the framework atoms, and the gel concentration.
Abstract: The conditions required to produce zeolites with low framework density and extra-large pores are discussed. Correlations between framework stability and geometrical and topological descriptors are presented. An attempt has been made to rationalize the synthesis of extra-large-pore zeolites in terms of the synthesis mechanism, the directing effect of the organic structure directing agent (OSDA), the framework atoms, and the gel concentration. Extra-large-pore zeolites, including the recently discovered chiral mesoporous ITQ-37, are described and their catalytic and adsorption properties discussed. Finally, strategies are presented for the preparation of extra-large-pore zeolites with different pore topologies that can fulfill pre-established catalytic and adsorption targets.

426 citations

Journal ArticleDOI
TL;DR: The results of this work confirm the xanthoxin→abscisic aldehyde→ABA transition as the last steps of the major ABA biosynthetic pathway.
Abstract: Mutants able to germinate and perform early growth in medium containing a high NaCl concentration were identified during the course of two independent screenings and named salt resistant ( sre ) and salobreno ( san ). The sre and san mutants also were able to germinate in high-osmoticum medium, indicating that they are osmotolerant in a germination assay. Complementation analyses revealed that sre1-1 , sre1-2 , san3-1 , and san3-2 were alleles of the abscisic acid (ABA) biosynthesis ABA2 gene. A map-based cloning strategy allowed the identification of the ABA2 gene and molecular characterization of four new aba2 alleles. The ABA2 gene product belongs to the family of short-chain dehydrogenases/reductases, which are known to be NAD- or NADP-dependent oxidoreductases. Recombinant ABA2 protein produced in Escherichia coli exhibits a K m value for xanthoxin of 19 � M and catalyzes in a NAD-dependent manner the conversion of xanthoxin to abscisic aldehyde, as determined by HPLC‐mass spectrometry. The ABA2 mRNA is expressed constitutively in all plant organs examined and is not upregulated in response to osmotic stress. The results of this work are discussed in the context of previous genetic and biochemical evidence regarding ABA biosynthesis, confirming the xanthoxin → abscisic aldehyde → ABA transition as the last steps of the major ABA biosynthetic pathway.

424 citations

Journal ArticleDOI
TL;DR: In this paper, a gas-phase glycerol/water mixture with zeolite catalysts was converted to acrolein through a series of reactions involving dehydration, cracking, and hydrogen transfer.

423 citations


Authors

Showing all 16503 results

NameH-indexPapersCitations
Avelino Corma134104989095
Bruce D. Hammock111140957401
Geoffrey A. Ozin10881147504
Wolfgang J. Parak10246943307
Hermenegildo García9779246585
María Vallet-Regí9571141641
Albert Ferrando8741936793
Rajendra Prasad8694529526
J.J. Garcia-Luna-Aceves8660225151
George W. Huber8428037964
Juan J. Calvete8145822646
Juan M. Feliu8054423147
Amparo Chiralt7829818378
Michael Tsapatsis7737520051
Josep Redon7748881395
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20241
2023130
2022331
20212,655
20202,861
20192,762