Search results for "Russia"

Photoswitchable coordination compounds

2001

Photoswitchable compounds represent an attractive class of materials in coordination chemistry. Recent progress dealing with transition metal compounds involving photo-induced changes of the magnetic and/or optical properties to long-lived metastable states are covered in the present review article. The basic photophysical phenomena together with representative examples such as nitroprusside derivatives, relevant spin crossover complexes, stilbenoid complexes and finally Prussian blue analogues are discussed. Some possible applications regarding energy and information storage are suggested at the end.

The role of inner counterions within PB films during electrochemical processes

1999

Abstract The shape of voltammograms of Prussian Blue films (ferric ferrocyanide, PB) deposited on ITO (indium–tin oxide) electrodes in aqueous KCl, CsCl and NH 4 Cl solutions has been studied. These results proved a double role of countercations during these electrochemical processes. Countercations can either be only retained within the zeolitic pores of the PB structure forming part of their inner solution, or can also form part of the crystalline structure of PB films by replacing some iron sites. The different electrochemical behaviour of PB films in the three studied solutions (KCl, CsCl and NH 4 Cl) is analysed from this point of view.

An Electronic Perspective On The Electrochemical Changeover In Prussian Blue-Like Materials

2009

Derivative voltabsometric scans together with previous electrogravimetric results allow to distinguish between the different electrochemical processes due to Fe-sites located into the Prussian Blue crystalline framework and other located next to ferrocyanide vacancies. The potassium, proton and hydrated proton counterions involved in these reactions are correlated to changes in near-UV/VIS/near-IR spectra. Potassium counter-ions show two different sites for insertion: one located into the crystalline framework and the other into ferrocyanide vacancies. From the monitoring of electroactive Fe-sites, it is possible to assume that the reduction of all Fe-sites located next to ferrocyanide vaca…

Electronic Perspective on the Electrochemistry of Prussian Blue Films

2009

The derivative of the voltabsommetric scans, together with previous nano-electrogravimetric and X-ray diffraction results, allow different electrochemical processes to be distinguished during the Prussian blue (PB) voltammetric scan. Potassium, proton, and hydrated proton counterions involved in PB electrochemistry are related here to the electrochemical reactions of specific Fe sites. Potassium counterions show two different sites for their insertion: one located in the crystalline framework and another in ferrocyanide vacancies. From the monitoring of electroactive Fe sites, the covalent-exchange model is suggested as one of the first approaches to explain the origin of the PB magnetic or…

Usefulness of F(dm/dQ) Function for Elucidating the Ions Role in PB Films

2007

The conversion process of "insoluble" prussian blue (PB) films into the "soluble" structure has been followed by the simultaneous measurement of current and mass changes during voltammetric experiments and focusing on the possibilities of the use of the instantaneous mass/electrical charge ratio at each potential. A similar procedure was used for the analysis of the mechanism of reduction of PB films to the Everitt's salt form and to follow the partial dissolution of iron species during the oxidation to the prussian yellow form. The possibility of covering PB films by Nafion membranes, which make difficult the transport of anions through it, allows us to discern the role of anions in the so…

Usefulness of the Instantaneous Mass-charge Ratio for Elucidating the Ions Role in the Stabilization and Dissolution Processes in Prussian Blue Films

2007

The conversion process of 'insoluble' Prussian Blue films into the 'soluble' structure has been followed by the simultaneous measurement of current and mass changes during voltammetric experiments and focusing on the possibilities of the use of the instantaneous mass/electrical charge ratio at each potential. A similar procedure was used for the analysis of the mechanism of reduction of Prussian Blue films to the Everitt's Salt form and to follow the partial dissolution of iron species during the oxidation to the Pussian Yellow form. The possibility of covering Prussian Blue films by Nafion membranes which make difficult the transport of anions through it allows to discern the role of anion…

The Roots of Chaadaev’s Philosophical Thought

2016

Pierwsza eurocentryczna koncepcja filozofii historii została stworzona przez Piotra Czaadajewa. Według tego chrześcijańskiego myśliciela jej ideał najlepiej odzwierciedlała średniowieczna Europa. Czaadajew czytał Kanta, Hegla i Schellinga, ale to francuscy filozofowie katoliccy: de Maistre, de Bonald, Ballanche, Chateaubriand i Lamennais, wywarli na niego największy wpływ. Specyficzny rodzaj konserwatywnego okcydentalizmu Czaadajewa charakteryzowało oskarżenie społeczeństwa rosyjskiego o brak tradycji, które mogłyby identyfikować Rosję z historią Europy. Według Czaadajewa kulturę rosyjską charakteryzuje brak ciągłości; nowe pomysły pojawiają się niespodziewanie, są pozbawione podstaw i brak…

Krievijas īstenotā tautiešu politika Latvijā kopš 2000. gada

2016

Maģistra darbs aplūko attiecības starp Latviju un Krievijas Federāciju, kuras nosaka Krievijas ārpolitikas mērķi attiecībā uz tās tautiešiem ārvalstīs. Pētījuma mērķis bija noskaidrot, vai Krievijas tautiešu politika rada Latvijai politiskos draudus, un izpētīt, kādi ir Krievijas tautiešu aizstāvības organizāciju darbības slēptie mērķi Latvijā. Maģistra darbs ir aprakstoša un analītiska gadījuma izpēte, kurā ir izmantotas kvalitatīvās pētniecības metodes: dokumentu analīze, sekundāro datu, kritiskā diskursa, video un interviju analīze. Pēc empīriskā materiāla analīzes, kas tika balstīta uz politisko draudu un politiskās destabilizācijas galvenajām pazīmēm, maģistra darba hipotēze – Krievija…

Dynamische kulturelle Prozesse. Peripherisierung und Entperipherisierung der Insel Rügen

2017

The flow of the communication and the flow of the medial communication take part in the processes of marginalization or centralization. The present construction of space and its actual classification is then introduced on grounds of testimonies of written words (the individual statements in letters, lyrics, journalism). This paper presents the progressing cultural marginalization of the Island landscape of Pomerania, and especially of the Island Rugen taking into account the three following phases: 1. Devaluation or evaluation of the north in the period of the Middle Ages and the early Modern Era in the context of the Christian mission and the Bible representation of order; 2. The beginning…

Interpretation of the Russian accounting information

2001