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https://www.readbyqxmd.com/read/29533636/coupled-yu-shiba-rusinov-states-in-molecular-dimers-on-nbse-2
#1
Shawulienu Kezilebieke, Marc Dvorak, Teemu Ojanen, Peter Liljeroth
Magnetic impurities have a dramatic effect on superconductivity by breaking the time-reversal symmetry and inducing so-called Yu-Shiba-Rusinov (YSR) low energy bound states within the superconducting gap. The spatial extent of YSR states is greatly enhanced in 2D systems, which should facilitate the formation of coupled states. Here, we observe YSR states on single cobalt phthalocyanine (CoPC) molecules on a 2D superconductor NbSe2 using low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS)...
March 13, 2018: Nano Letters
https://www.readbyqxmd.com/read/29450970/direct-imaging-of-space-charge-accumulation-and-work-function-characteristics-of-functional-organic-interfaces
#2
Pablo F Siles, Mirunalini Devarajulu, Feng Zhu, Oliver G Schmidt
The tailoring of organic systems is crucial to further extend the efficiency of charge transfer mechanisms and represents a cornerstone for molecular device technologies. However, this demands control of electrical properties and understanding of the physics behind organic interfaces. Here, a quantitative spatial overview of work function characteristics for phthalocyanine architectures on Au substrates is provided via kelvin probe microscopy. While macroscopic investigations are very informative, the current approach offers a nanoscale spatial rendering of electrical characteristics which is not possible to attain via conventional techniques...
February 16, 2018: Small
https://www.readbyqxmd.com/read/29313345/cobalt-catalyzed-aerobic-cross-dehydrogenative-coupling-of-c-h-and-thiols-in-water-for-c-s-formation
#3
Xin Huang, Yongqi Chen, Shan Zhen, Lijuan Song, Mingqi Gao, Panke Zhang, Heng Li, Bingxin Yuan, Guanyu Yang
Organosulfides have great significance and value in synthetic and biological chemistry. To establish a versatile and green methodology for C-S bond generation, we successfully developed a new aerobic cross-dehydrogenative coupling of C-H and S-H to synthesize aryl sulfides in water, utilizing CoPcS as the catalyst and O2 as the oxidant. This protocol shows great tolerance of a wide range of substrates. A large variety of organosulfur compounds were produced in modest to excellent yields.
January 24, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29303194/charge-transport-in-a-single-molecule-transistor-probed-by-scanning-tunneling-microscopy
#4
Samuel Bouvron, Romain Maurand, Alexander Graf, Philipp Erler, Luca Gragnaniello, Maxim Skripnik, Dirk Wiedmann, Clara Engesser, Cornelia Nef, Wangyang Fu, Christian Schönenberger, Fabian Pauly, Mikhail Fonin
We report on the scanning tunneling microscopy/spectroscopy (STM/STS) study of cobalt phthalocyanine (CoPc) molecules deposited onto a back-gated graphene device. We observe a clear gate voltage (Vg ) dependence of the energy position of the features originating from the molecular states. Based on the analysis of the energy shifts of the molecular features upon tuning Vg , we are able to determine the nature of the electronic states that lead to a gapped differential conductance. Our measurements show that capacitive couplings of comparable strengths exist between the CoPc molecule and the STM tip as well as between CoPc and graphene, thus facilitating electronic transport involving only unoccupied molecular states for both tunneling bias polarities...
January 18, 2018: Nanoscale
https://www.readbyqxmd.com/read/29251408/odontogenic-parakeratinized-cyst-resulting-in-exophthalmos-and-palatine-maxillary-and-zygomatic-bone-erosion-in-a-dog
#5
Vanessa L Holly, Lesley A Zwicker, Gregory Starrak, Marina L Leis, Bianca S Bauer, Stephanie Osinchuk, Lynne S Sandmeyer, Bruce H Grahn
A novel case of a canine odontogenic parakeratinized cyst (COPC) that resulted in exophthalmos and palatine, maxillary, and zygomatic bone erosion in a 5-year-old Chihuahua dog is reported. Final diagnosis was aided by cross-sectional imaging (magnetic resonance imaging and computed tomography) and confirmed with histologic examination of the cyst wall.
December 18, 2017: Veterinary Ophthalmology
https://www.readbyqxmd.com/read/29194945/generalized-synthesis-of-ultrathin-cobalt-based-nanosheets-from-metallophthalocyanine-modulated-self-assemblies-for-complementary-water-electrolysis
#6
Hao Wu, Zhimin Chen, Jialin Zhang, Feng Wu, Fei Xiao, Shichao Du, Chunying He, Yiqun Wu, Zhiyu Ren
The development of effective approaches for preparing large-area, self-standing, ultrathin metal-based nanosheets, which have proved to be favorable for catalytic applications such as water electrolysis, is highly desirable but remains a great challenge. Reported herein is a simple and versatile strategy to synthesize ultrathin Co3 O4 and CoP NSs consisting of close-packed nanoparticles by pyrolyzing cobalt(II) phthalocyanine/graphene oxide (CoPc/GO) assemblies in air and subsequent topotactic phosphidation while preserving the graphene-like morphology...
February 2018: Small
https://www.readbyqxmd.com/read/29128713/non-enzymatic-electrochemical-detection-of-glucose-with-a-disposable-paper-based-sensor-using-a-cobalt-phthalocyanine-ionic-liquid-graphene-composite
#7
Sudkate Chaiyo, Eda Mehmeti, Weena Siangproh, Thai Long Hoang, Hai Phong Nguyen, Orawon Chailapakul, Kurt Kalcher
We introduce for the first time a paper-based analytical device (PAD) for the non-enzymatic detection of glucose by modifying a screen-printed carbon electrode with cobalt phthalocyanine, graphene and an ionic liquid (CoPc/G/IL/SPCE). The modifying composite was characterized by UV-visible spectroscopy, energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The disposable devices show excellent conductivity and fast electron transfer kinetics...
April 15, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29090111/electronic-structure-transport-and-collective-effects-in-molecular-layered-systems
#8
Torsten Hahn, Tim Ludwig, Carsten Timm, Jens Kortus
The great potential of organic heterostructures for organic device applications is exemplified by the targeted engineering of the electronic properties of phthalocyanine-based systems. The transport properties of two different phthalocyanine systems, a pure copper phthalocyanine (CoPc) and a flourinated copper phthalocyanine-manganese phthalocyanine (F16 CoPc/MnPc) heterostructure, are investigated by means of density functional theory (DFT) and the non-equilibrium Green's function (NEGF) approach. Furthermore, a master-equation-based approach is used to include electronic correlations beyond the mean-field-type approximation of DFT...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28992894/chronic-prostatitis-and-comorbid-non-urological-overlapping-pain-conditions-a-co-twin-control-study
#9
Marianna Gasperi, John N Krieger, Christopher Forsberg, Jack Goldberg, Dedra Buchwald, Niloofar Afari
OBJECTIVES: Chronic prostatitis/chronic pelvic pain syndrome (CP/CPPS) is characterized by pain and voiding symptoms in the absence of an obvious infection or other cause. CP/CPPS frequently occurs with non-urological chronic overlapping pain conditions (COPCs) of unknown etiology. We conducted a co-twin control study in men discordant for chronic prostatitis (CP), an overarching diagnosis of which approximately 90% is CP/CPPS. The primary aim was to investigate the contribution of familial factors, including shared genetic and common environmental factors, to the comorbidity of CP and COPCs...
November 2017: Journal of Psychosomatic Research
https://www.readbyqxmd.com/read/28961400/relevance-of-the-interaction-between-the-m-phthalocyanines-and-carbon-nanotubes-in-the-electroactivity-toward-orr
#10
Carolina González-Gaitán, Ramiro Ruiz-Rosas, Emilia Morallón, Diego Cazorla-Amorós
In this work, the influence of the interaction between the iron and cobalt-phthalocyanines (FePc and CoPc) and carbon nanotubes (CNTs) used as support in the electroactivity toward oxygen reduction reaction (ORR) in alkaline media has been investigated. A series of thermal treatments were performed on these materials in order to modify the interaction between the CNTs and the phthalocyanines. The FePc-based catalysts showed the highest activity, with comparable performance to the state-of-the-art Pt-Vulcan catalyst...
October 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28853561/simultaneous-electrochemical-speciation-of-oxidized-and-reduced-glutathione-redox-profiling-of-oxidative-stress-in-biological-fluids-with-a-modified-carbon-electrode
#11
Patricia M Olmos Moya, Minerva Martínez Alfaro, Rezvan Kazemi, Mario A Alpuche-Avilés, Sophie Griveau, Fethi Bedioui, Silvia Gutiérrez Granados
The simultaneous electrochemical quantification of oxidized (GSSG) and reduced glutathione (GSH), biomarkers of oxidative stress, is demonstrated in biological fluids. The detection was accomplished by the development of a modified carbon electrode and was applied to the analysis of biological fluids of model organisms under oxidative stress caused by lead intoxication. Nanocomposite molecular material based on cobalt phthalocyanine (CoPc) and multiwalled carbon nanotubes functionalized with carboxyl groups (MWCNTf) was developed to modify glassy carbon electrodes (GCE) for the detection of reduced and oxidized glutathione...
October 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28773206/quantitative-immobilization-of-phthalocyanine-onto-bacterial-cellulose-for-construction-of-a-high-performance-catalytic-membrane-reactor
#12
Shiliang Chen, Qiaoling Teng
We report the fabrication of a tetra-amino cobalt (II) phthalocyanine (CoPc)-immobilized bacterial cellulose (BC) functional nanocomposite, CoPc@BC, by quantitative immobilization of CoPc onto a BC membrane. Lab-cultured BC was oxidized by NaIO₄ to generate aldehyde groups on BC for the subsequent CoPc immobilization, the processing conditions were optimized by monitoring both the generated aldehyde content and the resulting CoPc loading. X-ray photoelectron spectroscopy (XPS) was employed to characterize the change of the element bonding environment during the functionalization processes...
July 24, 2017: Materials
https://www.readbyqxmd.com/read/28764387/valence-electronic-structure-of-cobalt-phthalocyanine-from-an-optimally-tuned-range-separated-hybrid-functional
#13
Iulia Emilia Brumboiu, Georgia Prokopiou, Leeor Kronik, Barbara Brena
We analyse the valence electronic structure of cobalt phthalocyanine (CoPc) by means of optimally tuning a range-separated hybrid functional. The tuning is performed by modifying both the amount of short-range exact exchange (α) included in the hybrid functional and the range-separation parameter (γ), with two strategies employed for finding the optimal γ for each α. The influence of these two parameters on the structural, electronic, and magnetic properties of CoPc is thoroughly investigated. The electronic structure is found to be very sensitive to the amount and range in which the exact exchange is included...
July 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28649689/the-first-transition-metal-phthalocyanines-sensitizing-rubrene-emission-based-on-triplet-triplet-annihilation
#14
Jianlei Han, Fei Zhang, Jing You, Yonemura Hiroaki, Sunao Yamada, Toru Morifuji, Shirong Wang, Xianggao Li
Metallophthalocyanines (MPc-o-Cou, M = Fe, Co, Ni, and Cu) with fourth period metal ions have been successfully applied as a sensitizer coupled with rubrene (Rub) in photon upconversion based on triplet-triplet annihilation. An upconversion quantum yield (ϕPUC ) of up to 4.82% was observed in the CoPc-o-Cou : Rub couple. The absorption and phosphorescence emission spectra showed that the Q bands and phosphorescence emission peaks were dramatically dependent on the number of d-electrons of the metal ions in MPc-o-Cou...
September 13, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28288216/rovibrational-spectroscopic-constants-of-the-interaction-between-ammonia-and-metallo-phthalocyanines-a-theoretical-protocol-for-ammonia-sensor-design
#15
Alan R Baggio, Daniel F S Machado, Valter H Carvalho-Silva, Leonardo G Paterno, Heibbe Cristhian B de Oliveira
In the present contribution, we develop an adapted theoretical approach based on DFT calculations (B3LYP functional) and solution of the nuclear Schrödinger equation by using the Discrete Variable Representation method to model the interaction of ammonia with metallo-phthalocyanines (MPcs, where M = Fe2+ , Co2+ , Ni2+ , Cu2+ or Zn2+ ). This approach is intended to be a general protocol for the rational design of chemical sensors. The as-obtained binding energy curves, obtained from ab initio points, permitted us to calculate rovibrational energies and spectroscopic constants, as well as to establish the relative population of rovibrational states in different types of MPc-NH3 thermodynamic systems...
May 3, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28272403/highly-selective-and-active-co2-reduction-electrocatalysts-based-on-cobalt-phthalocyanine-carbon-nanotube-hybrid-structures
#16
Xing Zhang, Zishan Wu, Xiao Zhang, Liewu Li, Yanyan Li, Haomin Xu, Xiaoxiao Li, Xiaolu Yu, Zisheng Zhang, Yongye Liang, Hailiang Wang
Electrochemical reduction of carbon dioxide with renewable energy is a sustainable way of producing carbon-neutral fuels. However, developing active, selective and stable electrocatalysts is challenging and entails material structure design and tailoring across a range of length scales. Here we report a cobalt-phthalocyanine-based high-performance carbon dioxide reduction electrocatalyst material developed with a combined nanoscale and molecular approach. On the nanoscale, cobalt phthalocyanine (CoPc) molecules are uniformly anchored on carbon nanotubes to afford substantially increased current density, improved selectivity for carbon monoxide, and enhanced durability...
March 8, 2017: Nature Communications
https://www.readbyqxmd.com/read/28157314/molecular-chessboard-assemblies-sorted-by-site-specific-interactions-of-out-of-plane-d-orbitals-with-a-semimetal-template
#17
Aneliia Wäckerlin, Shadi Fatayer, Thomas Nijs, Sylwia Nowakowska, S Fatemeh Mousavi, Olha Popova, Aisha Ahsan, Thomas A Jung, Christian Wäckerlin
We show that highly ordered two-dimensional (2D) chessboard arrays consisting of a periodic arrangement of two different molecules can be obtained by self-assembly of unsubstituted metal-phthalocyanines (metal-Pcs) on a suitable substrate serving as the template. Specifically, CuPc + MnPc and CuPc + CoPc mixtures sort into highly ordered Cu/Mn and Cu/Co chessboard arrays on the square p(10 × 10) reconstruction of bismuth on Cu(100). Such created bimolecular chessboard assemblies emerge from the site-specific interactions between the central transition-metal ions and the periodically reconstructed substrate...
March 8, 2017: Nano Letters
https://www.readbyqxmd.com/read/28155322/an-assessment-of-implementation-of-communityoriented-primary-care-in-kenyan-family-medicine-postgraduate-medical-education-programmes
#18
Ian J Nelligan, Jacob Shabani, Stephanie Taché, Gulnaz Mohamoud, Megan Mahoney
BACKGROUND AND OBJECTIVES: Family medicine postgraduate programmes in Kenya are examining the benefits of Community-Oriented Primary Care (COPC) curriculum, as a method to train residents in population-based approaches to health care delivery. Whilst COPC is an established part of family medicine training in the United States, little is known about its application in Kenya. We sought to conduct a qualitative study to explore the development and implementation of COPC curriculum in the first two family medicine postgraduate programmes in Kenya...
December 2, 2016: African Journal of Primary Health Care & Family Medicine
https://www.readbyqxmd.com/read/28076691/removal-of-copper-from-aqueous-solutions-by-rhizofiltration-using-genetically-modified-hairy-roots-expressing-a-bacterial-cu-binding-protein
#19
Patricia Pérez-Palacios, Elizabeth Agostini, Sabrina G Ibáñez, Melina A Talano, Ignacio D Rodríguez-Llorente, Miguel A Caviedes, Eloísa Pajuelo
The aim of this work was to develop a biotechnological tool to hyperaccumulate high copper (Cu) concentrations from wastewaters. Transgenic tobacco hairy roots were obtained by expressing, either the wild-type version of the gene copC from Pseudomonas fluorescens in the cytoplasm of plant cells (CuHR), or a modified version targeted to the vacuole (CuHR-V). Control hairy roots transformed with the empty vector (HR) were also generated. The roots were incubated in the presence of solutions containing Cu (from 1 to 50 mM)...
November 2017: Environmental Technology
https://www.readbyqxmd.com/read/27902937/study-on-the-interaction-between-curcumin-and-copc-by-spectroscopic-and-docking-methods
#20
Zhen Song, Wen Yuan, Ruitao Zhu, Song Wang, Caifeng Zhang, Binsheng Yang
Curcumin is a widely studied polyphenolic compound which has a variety of biological activity as anti-inflammatory and antitumor drugs. Recent research reported that copper chaperone binding with small molecular may relate to the treatment of cancer. In this work, the interaction between curcumin and CopC has been investigated in detail by means of UV-vis absorption, FTIR, CD, fluorescence spectroscopic and molecular docking methods The results showed that the CopC conformation was altered by curcumin with reduction of β-sheet and increase of random coil...
March 2017: International Journal of Biological Macromolecules
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