Atom Efficient Preparation of Zinc Selenates for the Synthesis Of
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Zinc Selenide Quantum Dots
Chapter 3 Zinc Selenide Quantum Dots 3.1 Introduction: Nanoscale materials have been extensively studied in recent years to study the evolution of the electronic structure from molecules to bulk. The properties or the electronic structure of nanoparticles is not a simple extrapolation of its corresponding molecular or bulk state. Quantum dots show unique features arising from the variation in crystal structure parameters, discretization of electron energy levels, concentration of oscillator strength for particular transitions, high polarizability of electron energy levels and increased surface to volume ratio [1-4]. Quantum confinement in semiconductors leads to discrete transitions that are blue shifted in energy from the bulk. Inhomogeneous broadening of the optical spectra due to size distribution and shape variations of the nanoparticles, conceal the fine structure in the energy states of quantum dots. In order to study the evolution of the electronic, optical and structural properties of material with size it is essential to synthesize nanoparticles of different sizes (with narrow size distribution) and controlled surface properties. II-VI semiconductors are relatively easy to synthesize, yielding free standing colloidal quantum dots by wet chemical routes. The evolving electronic structure as a function of size can be determined by non-contact optical probes in case of direct band gap II-VI semiconductors. The quantum size effects in CdSe nanoparticles with wurtzite structure are thoroughly investigated [5], while relatively less attention is being paid to other II-VI nanocrystals such as zinc selenide or zinc oxide. ZnSe is a II-VI direct band gap, zinc blende semiconductor with a bulk band gap of 2.7 eV at room temperature. -
Zinc Selenide Optical Crystal
Revision date: 07/12/2020 Revision: 1 SAFETY DATA SHEET Zinc Selenide Optical Crystal SECTION 1: Identification of the substance/mixture and of the company/undertaking 1.1. Product identifier Product name Zinc Selenide Optical Crystal CAS number 1315-09-9 EU index number 034-002-00-8 EC number 215-259-7 1.2. Relevant identified uses of the substance or mixture and uses advised against Identified uses Optical Material for manufacture of Optical Components 1.3. Details of the supplier of the safety data sheet Supplier Knight Optical (UK) LTD Roebuck Business Park Harrietsham Kent ME17 1AB UK +44 (0)1622 859444 [email protected] 1.4. Emergency telephone number Emergency telephone +44 (0)1622 859444 (Monday to Friday 08:30 to 17:00 GMT) SECTION 2: Hazards identification 2.1. Classification of the substance or mixture Classification (EC 1272/2008) Physical hazards Not Classified Health hazards Acute Tox. 3 - H301 Acute Tox. 3 - H331 Environmental hazards Aquatic Chronic 1 - H410 2.2. Label elements EC number 215-259-7 Hazard pictograms Signal word Danger Hazard statements H301+H331 Toxic if swallowed or if inhaled. H410 Very toxic to aquatic life with long lasting effects. 1/10 Revision date: 07/12/2020 Revision: 1 Zinc Selenide Optical Crystal Precautionary statements P264 Wash contaminated skin thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P273 Avoid release to the environment. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P501 Dispose of contents/ container in accordance with national regulations. -
Selenol-Based Nucleophilic Reaction for the Preparation of Reactive Oxygen Species-Responsive Amphiphilic Diblock Copolymers
polymers Article Selenol-Based Nucleophilic Reaction for the Preparation of Reactive Oxygen Species-Responsive Amphiphilic Diblock Copolymers Xiaowei An, Weihong Lu, Jian Zhu * , Xiangqiang Pan * and Xiulin Zhu Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China; [email protected] (X.A.); [email protected] (W.L.); [email protected] (X.Z.) * Correspondence: [email protected] (J.Z.); [email protected] (X.P.); Tel.: +86-512-6588-0726 (J.Z.); +86-512-6588-3343 (X.P.) Received: 15 February 2019; Accepted: 5 May 2019; Published: 8 May 2019 Abstract: Selenide-containing amphiphilic copolymers have shown significant potential for application in drug release systems. Herein, we present a methodology for the design of a reactive oxygen species-responsive amphiphilic diblock selenide-labeled copolymer. This copolymer with controlled molecular weight and narrow molecular weight distribution was prepared by sequential organoselenium-mediated reversible addition fragmentation chain transfer (Se-RAFT) polymerization and selenol-based nucleophilic reaction. Nuclear magnetic resonance (NMR) and matrix-assisted laser desorption/ionization time-to-flight (MALDI-TOF) techniques were used to characterize its structure. Its corresponding nanomicelles successfully formed through self-assembly from the copolymer itself. Such nanomicelles could rapidly disassemble under oxidative conditions due to the fragmentation of the Se–C bond. Therefore, this type of nanomicelle based on selenide-labeled amphiphilic copolymers potentially provides a new platform for drug delivery. Keywords: RAFT; selenol; amphiphilic polymer; drug delivery 1. Introduction Compared with sulfur, selenium shows versatile properties owing to its larger atomic radius and relatively lower electronegativity [1]. -
Annual Report 2013-2014
ANNUAL REPORT 2013 – 14 One Hundred and Fifth Year Indian Institute of Science Bangalore - 560 012 i ii Contents Page No Page No Preface 5.3 Departmental Seminars and IISc at a glance Colloquia 120 5.4 Visitors 120 1. The Institute 1-3 5.5 Faculty: Other Professional 1.1 Court 1 Services 121 1.2 Council 2 5.6 Outreach 121 1.3 Finance Committee 3 5.7 International Relations Cell 121 1.4 Senate 3 1.5 Faculties 3 6. Continuing Education 123-124 2. Staff 4-18 7. Sponsored Research, Scientific & 2.1 Listing 4 Industrial Consultancy 125-164 2.2 Changes 12 7.1 Centre for Sponsored Schemes 2.3 Awards/Distinctions 12 & Projects 125 7.2 Centre for Scientific & Industrial 3. Students 19-25 Consultancy 155 3.1 Admissions & On Roll 19 7.3 Intellectual Property Cell 162 3.2 SC/ST Students 19 7.4 Society for Innovation & 3.3 Scholarships/Fellowships 19 Development 163 3.4 Assistance Programme 19 7.5 Advanced Bio-residue Energy 3.5 Students Council 19 Technologies Society 164 3.6 Hostels 19 3.7 Award of Medals 19 8. Central Facilities 165-168 3.8 Placement 21 8.1 Infrastructure - Buildings 165 8.2 Activities 166 4. Research and Teaching 26-116 8.2.1 Official Language Unit 166 4.1 Research Highlights 26 8.2.2 SC/ST Cell 166 4.1.1 Biological Sciences 26 8.2.3 Counselling and Support Centre 167 4.1.2 Chemical Sciences 35 8.3 Women’s Cell 167 4.1.3 Electrical Sciences 46 8.4 Public Information Office 167 4.1.4 Mechanical Sciences 57 8.5 Alumni Association 167 4.1.5 Physical & Mathematical Sciences 75 8.6 Professional Societies 168 4.1.6 Centres under Director 91 4.2. -
Ditellurides
Molecules 2010, 15, 1466-1472; doi:10.3390/molecules15031466 OPEN ACCESS molecules ISSN 1420-3049 www.mdpi.com/journal/molecules Article Novel Oxidative Ring Opening Reaction of 1H-Isotelluro- chromenes to Bis(o-formylstyryl) Ditellurides Haruki Sashida 1,*, Hirohito Satoh 1, Kazuo Ohyanagi 2 and Mamoru Kaname 1 1 Faculty of Pharmaceutical Sciences, Hokuriku University, Kanagawa-machi, Kanazawa 920-1181, Japan; E-Mail: [email protected] (M.K.) 2 Faculty of Pharmacy, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan; E-Mail: [email protected] (K.O.) * Author to whom correspondence should be addressed; E-Mail: [email protected]; Tel.: +81-76-229-6211; Fax: +81-76-229-2781. Received: 5 January 2010; in revised form: 2 February 2010 / Accepted: 5 March 2010 / Published: 9 March 2010 Abstract: The oxidation of 1-unsubstituted or 1-phenyl-1H-isotellurochromenes with m-chloroperbenzoic acid (mCPBA) in CHCl3 resulted in a ring opening reaction to produce as the sole products the corresponding o-formyl or benzoyl distyryl ditellurides, which were also produced by the hydrolysis of the 2-benzotelluropyrylium salts readily prepared from the parent isotellurochromene. Keywords: isotellurochromene; mCPBA oxidation; 2-benzotelluropyrylium salt; distyryl ditelluride 1. Introduction The preparation and investigation of the reactions of new tellurium-containing heterocycles have lately attracted increasing interest in the fields of both heterocyclic [1–3] and organotellurium chemistry [4–8]. We have been studying the syntheses and reactions of the novel tellurium- or selenium-containing heterocyclic compounds over the past twenty years. -
Material Safety Data Sheet
LTS Research Laboratories, Inc. Safety Data Sheet Zinc Selenide ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– 1. Product and Company Identification ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– Trade Name: Zinc selenide Chemical Formula: ZnSe Recommended Use: Scientific research and development Manufacturer/Supplier: LTS Research Laboratories, Inc. Street: 37 Ramland Road City: Orangeburg State: New York Zip Code: 10962 Country: USA Tel #: 855-587-2436 / 855-lts-chem 24-Hour Emergency Contact: 800-424-9300 (US & Canada) +1-703-527-3887 (International) ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– 2. Hazards Identification ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– Signal Word: Danger Hazard Statements: H301+H331: Toxic if swallowed or if inhaled H373: May cause damage to organs through central nervous system, the liver, and the digestive system through prolonged or repeated exposure. Route of exposure: Oral, inhalative. H410 Very toxic to aquatic life with long lasting effects Precautionary Statements: P260 Do not breathe dust/fume/gas/mist/vapours/spray P264 Wash skin thoroughly after handling P273: Avoid release to the environment P270: Do not eat, drink, or smoke when using this product. P309: IF exposed or you feel unwell: P310: Immediately call a POISON CENTER or doctor/physician P302+P352: IF ON SKIN: Wash with soap and water P391: Collect -
Investigations of Phonons in Zinc Blende and Wurtzite by Raman Spectroscopy 25
ProvisionalChapter chapter 2 Investigations of of Phonons Phonons in Zinc in Zinc Blende Blende and Wurtziteand Wurtzite by Raman Spectroscopy by Raman Spectroscopy Lin Sun, Lingcong Shi and Chunrui Wang Lin Sun, Lingcong Shi and Chunrui Wang Additional information is available at the end of the chapter Additional information is available at the end of the chapter http://dx.doi.org/10.5772/64194 Abstract The importance of phonons and their interactions in bulk materials is well known to those working in the fields of solid‐state physics, solid‐state electronics, optoelectronics, heat transport, quantum electronic, and superconductivity. Phonons in nanostructures may act as a guide to research on dimensionally confined phonons and lead to phonon effects in nanostructures and phonon engineering. In this chapter, we introduce phonons in zinc blende and wurtzite nanocrystals. First, the basic structure of zinc blende and wurtzite is described. Then, phase transformation between zinc blende and wurtzite is presented. The linear chain model of a one‐dimensional diatomic crystal and macroscopic models are also discussed. Basic properties of phonons in wurtzite structure will be considered as well as Raman mode in zinc blende and wurtzite structure. Finally, phonons in ZnSe, Ge, SnS2, MoS2, and Cu2ZnSnS4 nanocrystals are discussed on the basis of the above theory. Keywords: phonons, zinc blende, wurtzite, Raman spectroscopy, molecular vibration 1. Zinc blende and wurtzite structure Crystals with cubic/hexagonal structure are of major importance in the fields of electronics and optoelectronics. Zinc blende is typical face‐centered cubic structure, such as Si, Ge, GaAs, and ZnSe. Wurtzite is typical hexagonal close packed structure, such as GaN and ZnSe. -
Synthesis, Characterization and Optical Properties of Znse Nanoparticles
International Journal of Applied Engineering Research ISSN 0973-4562 Volume 13, Number 6 (2018) pp. 4606-4609 © Research India Publications. http://www.ripublication.com Synthesis, Characterization and Optical Properties of ZnSe Nanoparticles Anil Yadav1, 2*, S. P. Nehra2, Dinesh Patidar3 1Department of Chemical Engineering, Deenbandhu Chhotu Ram University of Science & Technology, Murthal, Sonepat (Haryana) India. 2Centre of Excellence for Energy & Environmental Studies, Deenbandhu Chhotu Ram University of Science & Technology, Murthal, Sonepat (Haryana) India. 3Department of Physics, Seth G.B. Podar College, Nawalgarh, Jhunjhunu (Rajasthan) India. *Corresponding Author Abstract characterization of ZnSe semiconductors consisting particles of 2-100 nm, which are generally referred as quantum dots The chemical co-precipitation method was employed to and nanocrystals. The interests of the researchers are mainly synthesize zinc selenide (ZnSe ) nanoparticles with the help of because of their size-tunable optical, electronic and chemical Selenium powder, sodium borohydride, zinc acetate. properties [3,4]. Further miniaturization of optical and Mercaptoethanol was added as capping agent. The XRD, electronic devices leads to their commercial applications [1,4- SEM and TEM techniques were employed for the 9] are as diverse as solar cells, catalysis, biological labelling, characterization of ZnSe nanoparticles. The average diameter light-emitting diodes. As we know that Size and shape of the of ZnSe nanoparticles is 15 nm. HR transmission electron nanomaterials are responsible for their properties but synthesis microscopy (HRTEM) image displays the crystalline features of stable monodispersed nanocrystals is still a great challenge of ZnSe nanoparticles. The PL emission spectrum indicates a in Nanoscience. The control of shape of nanocrystals is also peak centered at 480 nm along with two shoulders at 453 and very important .The correlation exists between the shape and 520 nm. -
Durham E-Theses
Durham E-Theses Methtleneamino-derivatives of some transition metal carbonyls Midcalf, Christopher How to cite: Midcalf, Christopher (1971) Methtleneamino-derivatives of some transition metal carbonyls, Durham theses, Durham University. Available at Durham E-Theses Online: http://etheses.dur.ac.uk/8649/ Use policy The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that: • a full bibliographic reference is made to the original source • a link is made to the metadata record in Durham E-Theses • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders. Please consult the full Durham E-Theses policy for further details. Academic Support Oce, Durham University, University Oce, Old Elvet, Durham DH1 3HP e-mail: [email protected] Tel: +44 0191 334 6107 http://etheses.dur.ac.uk METHYLENEAMINO- DERTVATIVE S OF SOME TRANSITION METAL CARBONYLS by Christopher Midcalf, B.Sc. A thesis submitted to the University of Durham for the degree of Doctor of Philosophy July 1971 MEMORANDUM The work described in this thesis was carried out in the University of Durham between October 1968 and July 1971. It has not been submitted for any other degree and is the original work of the author except when acknowledged by reference. Part of the work in this thesis has formed the subject matter of the following publications: (i) Unsaturated Organonitrogen Groups in Carbonyl Complexes of Molybdenum, Tungsten and Manganese. -
A Scalable Process for the Synthesis of 1,2-Dialkyldiselanes and 1-Alkaneselenols
This is a repository copy of A Scalable Process for the Synthesis of 1,2-Dialkyldiselanes and 1-Alkaneselenols. White Rose Research Online URL for this paper: http://eprints.whiterose.ac.uk/152805/ Version: Accepted Version Article: Cooksey, JP, Kocieński, PJ and Blacker, AJ orcid.org/0000-0003-4898-2712 (2019) A Scalable Process for the Synthesis of 1,2-Dialkyldiselanes and 1-Alkaneselenols. Organic Process Research & Development, 23 (11). pp. 2571-2575. ISSN 1083-6160 https://doi.org/10.1021/acs.oprd.9b00380 © 2019 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Organic Process Research and Development, copyright © American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.oprd.9b00380 Reuse Items deposited in White Rose Research Online are protected by copyright, with all rights reserved unless indicated otherwise. They may be downloaded and/or printed for private study, or other acts as permitted by national copyright laws. The publisher or other rights holders may allow further reproduction and re-use of the full text version. This is indicated by the licence information on the White Rose Research Online record for the item. Takedown If you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing [email protected] including the URL of the record and the reason for the withdrawal request. [email protected] https://eprints.whiterose.ac.uk/ A Scalable Process for the Synthesis of 1,2-Dialkyldiselanes and 1- Alkaneselenols John P. -
Methylselenol Produced in Vivo from Methylseleninic Acid Or Dimethyl Diselenide Induces Toxic Protein Aggregation in Saccharomyces Cerevisiae
International Journal of Molecular Sciences Article Methylselenol Produced In Vivo from Methylseleninic Acid or Dimethyl Diselenide Induces Toxic Protein Aggregation in Saccharomyces cerevisiae Marc Dauplais 1, Katarzyna Bierla 2, Coralie Maizeray 1, Roxane Lestini 3 , Ryszard Lobinski 2,4,5, Pierre Plateau 1, Joanna Szpunar 2 and Myriam Lazard 1,* 1 Laboratoire de Biologie Structurale de la Cellule, BIOC, École Polytechnique, CNRS-UMR7654, IP Paris, 91128 Palaiseau CEDEX, France; [email protected] (M.D.); [email protected] (C.M.); [email protected] (P.P.) 2 IPREM UMR5254, E2S UPPA, Institut des Sciences Analytiques et de Physico-Chimie Pour l’Environnement et les Matériaux, CNRS, Université de Pau et des Pays de l’Adour, Hélioparc, 64053 Pau, France; [email protected] (K.B.); [email protected] (R.L.); [email protected] (J.S.) 3 Laboratoire d’Optique et Biosciences, École Polytechnique, CNRS UMR7645—INSERM U1182, IP Paris, 91128 Palaiseau CEDEX, France; [email protected] 4 Laboratory of Molecular Dietetics, I.M. Sechenov First Moscow State Medical University, 19048 Moscow, Russia 5 Chair of Analytical Chemistry, Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warszawa, Poland * Correspondence: [email protected] Abstract: Methylselenol (MeSeH) has been suggested to be a critical metabolite for anticancer activity Citation: Dauplais, M.; Bierla, K.; of selenium, although the mechanisms underlying its activity remain to be fully established. The aim Maizeray, C.; Lestini, R.; Lobinski, R.; of this study was to identify metabolic pathways of MeSeH in Saccharomyces cerevisiae to decipher the Plateau, P.; Szpunar, J.; Lazard, M. -
Durham E-Theses
Durham E-Theses A spectroscopic study of some halogeno-complexes of tellurium (IV) Gorrell, Ian Barnes How to cite: Gorrell, Ian Barnes (1983) A spectroscopic study of some halogeno-complexes of tellurium (IV), Durham theses, Durham University. Available at Durham E-Theses Online: http://etheses.dur.ac.uk/7890/ Use policy The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that: • a full bibliographic reference is made to the original source • a link is made to the metadata record in Durham E-Theses • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders. Please consult the full Durham E-Theses policy for further details. Academic Support Oce, Durham University, University Oce, Old Elvet, Durham DH1 3HP e-mail: [email protected] Tel: +44 0191 334 6107 http://etheses.dur.ac.uk A SPECTROSCOPIC STUDY OF SOME HALOGENO- COMPLEXES OF TELLURIUM (IV) by Ian Barnes Gorrell A thesis submitted in part fulfilment of the requirements for the degree of Master of Science in the University of Durham. The copyright of this thesis rests with the author. April 19 8 3 No quotation from it should be published without his prior written consent and information derived from it should be acknowledged. -5. OFC. 1983 TO MY MOTHER and MY FATHER1 S MEMORY' iii ACKNOWLEDGMENTS I wish to express my gratitude towards the late Professor T.C.