Wyniki wyszukiwania - Biblioteka Nauki

1

Synthesis of New Polycyclic Anthracenedione Analogs with Hetero- or Carbocyclic Ring(s) Fused to the Chromophore System

100%

Dzieduszycka M. , Stefańska B. , Gawrońska M. , Arciemiuk M. , Borowski E.

Polish Journal of Chemistry

|

2007

|

tom Vol. 81, nr 4

535-545

EN

A series of novel anthracenedione analogs with various hetero- or carbocyclic ring(s) incorporated into the chromophore has been synthesized. These compounds may constitute a new class of anthracenedione agents with potential ability to overcomemultidrug resistance of cancer cells.

2

Synthesis of optically active 4,5-dihydroisoxazolecarboxylic acids

100%

Zadrożna I. , Kurkowska J. , Makuch I.

Bulletin of the Polish Academy of Sciences. Chemistry

|

1999

|

tom Vol. 47, No. 2

111-118

EN

A series of regioisomers of 4,5-dihydroisoxazolecarboxylates have been synthesized in the 1,3-dipolar intermolecular cycloaddition and subjected to enzymatic hydrolysis by o:-chymotrypsin from bovine pancreas ( type II) and to micro bial hydrolysis by an Aspergillus niger fungus. For some compounds this hydrolysis time led to the obtaining of a racemic mixture, and for others the reaction was enantioselective.

3

Studies of pyridazine derivatives: synthesis of pyrrolo[2,3-c]pyridazine and related compounds

100%

El-Dean A. M. K. , Geies A. A. , Radwan S. M.

Bulletin of the Polish Academy of Sciences. Chemistry

|

1999

|

tom Vol. 47, No. 2

135-142

EN

The reaction of 3-chloro-5,6-diphenylpyridazine-4-carbonitrile ( 4) with ethyl glycinate in DMF/K2CO3 gave the ester derivative 8, which underwent ring closure using ethoxide solution to give ethyl 5-amino-3,4-diphenyl-7-(H)-pyrrolo[2,3-c] pyridazine 6-carboxylate 9. This upon heating with formamide yielded pyrimido [4',5':4,5] pyrrolo[2,3-c]pyridazine derivative 10.

4

Synthesis of Novel 4-Chloro-5-methyl-2-(R-thio)-N-(2,3-dihydro-1,3,4-thiadiazol-2-ylidene)benzenesulfonamide Derivatives

100%

Sławiński J.

Polish Journal of Chemistry

|

2006

|

tom Vol. 80, nr 9

1503-1511

EN

Two series of novel 4-chloro-5-methyl-2-(R-thio)-N-(2,3-dihydro-1,3,4-thiadiazol-2- ylidene)benzenesulfonamide derivatives 5-14 were synthesized by the reaction of potassium 6-chloro-1,1-dioxo-7-methyl-1,4,2-benzodithiazine-3-thiolate (1) or 6-chloro-3- mercapto-7-methyl-1,4,2-benzodithiazine 1,1-dioxide (2) with hydrazonyl bromides 3a-g. Suggested mechanisms of the investigated reaction were discussed. Themolecular orbital calculation of the possible tautomeric forms of 3-mercaptobenzodithiazine 2 were also presented.

5

Celowość i możliwości surowcowo-technologiczne syntezy wollastonitu w Polsce.

80%

Puff Z. , Salaciński R.

Szkło i Ceramika

|

2003

|

tom R. 54, nr 2

14-18

6

Application of mechanical and electrical elements in reduction of vibration

80%

Białas K.

Journal of Achievements in Materials and Manufacturing Engineering

|

2012

|

tom Vol. 52, nr 1

31--38

EN

Purpose: This work presents methods of reduction of the vibration of mechanical systems by means of passive and active elements as well as examples of implementation of active reduction of vibration by means of electrical elements and mechanical elements in the form of kinematic excitation. Design/methodology/approach: This work also describes a structural and parametric synthesis, which can be defined as the design of systems meeting specific requirements. These requirements refer to the frequency values of the systems’ vibration. Findings: The examples of implementation of active subsystems presented in this work point out to the fact that one can use mechanical elements as well as electrical elements to reduce mechanical vibration. By applying such elements it is possible to obtain mechanical energy necessary for the active reduction of vibration. Research limitations/implications: The deliberations presented in this paper are limited to the presentation of possible physical implementation of active elements by means of mechanical and electrical elements. In active subsystems one may also use elements from other environments. In the next phase one should analyse the resultant systems and investigate the interaction between the subsystems and the basic system. Practical implications: The results represented this work extend the tasks of synthesis to other spheres of science. The practical realization of the reverse task of dynamics introduced in this work can find uses in designing of machines with active and passive elements with the required frequency spectrum. Originality/value: The presented approach i.e. a non-classical synthetic method applied in designing mechanical systems, one (as early as at the design and construction stage) may verify future systems.

7

Nośnikowe katalizatory rutenowe do niskociśnieniowej syntezy amoniaku

80%

Kowalczyk Z. , Szmigiel D. , Raróg-Pilecka W. , Komornicki A. , Kielak M. , Gliński M.

Przemysł Chemiczny

|

2003

|

tom T. 82, nr 8-9

725-727

8

Synthesis and Magnetic Studies of Binuclear Iron(II) Complexes Bridged by Tetracarboxylato Groups

80%

Li Y.

Polish Journal of Chemistry

|

2002

|

tom Vol. 76 / nr 12

1681-1687

EN

Four novel binuclear iron(II) complexes, namely [Fe2(PMTA)L4], where L denotes 4,4_-dimethyl-2,2_-bipyridine (Me2-bpy); 1,10-phenanthroline (phen); 5-chloro-1,10- phenanthroline (Cl-phen) or 5-bromo-1,10-phenanthroline (Br-phen), respectively, and PMTA stands for the tetraanion of pyromellitic acid, have been synthesized and characterized. Based on elemental analyses, magnetic moments at room-temperature and molar conductivity measurements, and spectroscopic (electronic and IR spectra) studies, extended PMTA-bridged structures consisting of two iron(II) ions, each in a distorted octahedral environment, are proposed for these complexes. The variable temperature magnetic susceptibilities (4_300 K) of the complexes [Fe2(PMTA)(Me2-bpy)4] (1) and [Fe2(PMTA)(phen)4] (2) were measured and the magnetic analysis was carried out by least-square method to the observed data with the susceptibility equation derived from the spin Hamiltonian operator, _ _ _ H 2JS S 1 2 _ _ _ , giving the exchange integrals J = _1.09 cm_1 for (1) and J = ___18 cm_1 for (2). The results indicate that there is a very weak antiferromagnetic spin-exchange interaction between the Fe(II) ions within each molecule.

9

Bis(dialkylaminomethyl)phosphinic Acids and Their Addition Compounds with Tetrahedral {MCl4]2-Ions (M=Cu II, Co II)

80%

Kasparek F.

Polish Journal of Chemistry

|

2002

|

tom Vol. 76 / nr 10

1389-1397

EN

Monohydrate monohydrochloride of bis(dialkylaminomethyl)phosphinic acids of the composition, [(R1HCH2)2PO2]Cl_H2O {R1 = Me2 N, Et2N, (n-Bu)2N, C5H10N, OC4H8N}, dihydrate dihydrochloride of bis(dialkylaminomethyl)phosphinic acids, [(R2HCH2)2P(O)OH]Cl2_2H2O {R2 = Me2 N, C4H8N, C5H10N, OC4H8N}, and their copper(II) and cobalt(II) addition compounds with tetrahedral [MCl4]2- ions {M = CuII, CoII} have been prepared and characterized by elemental analyses, effective magnetic moments, IR, VIS, and 1H and 31P-NMR spectra. Crystal and molecular structures of [(OC4H8NHCH2)2PO2]Cl_H2O and [(OC4H8NHCH2)2PO2]2CuCl4 have also been determined.

10

Antiferromagnetically Coupled Binuclear Chromium(III) Complexes Through mi-Isophthalato-Bridge

80%

Li Y. , Yan C. W. , Guan H. S.

Polish Journal of Chemistry

|

2003

|

tom Vol. 77 / nr 8

953-959

EN

Three new _-isophthalato-bridged binuclear chromium(III) complexes were synthesized and characterized, namely [Cr2(IPHTA)(Me2bpy)4](NO3)4 (1), [Cr2(IPHTA)(Me2phen)4](NO3)4 (2) and [Cr2(IPHTA)(Cl-phen)4](NO3)4 (3), where IPHTA represents the isophthalate dianions; Me2bpy, Me2phen and Cl-phen stand for 4,4_-dimethyl-2,2_-bipyridine; 2,9-dimethyl-1,10-phenanthroline and 5-chloro- 1,10-phenanthroline, respectively. The three complexes have not yet been isolated in crystalline form suitable for X-ray structure analysis, but based on elemental analyses, molar conductance and magnetic moments of room-temperature measurements, and spectroscopic studies, extended IPHTA-bridged structures consisting of two chromium( III) ions, each in an octahedral environment are proposed for these complexes. The complexes [Cr2(IPHTA)(Me2bpy)4](NO3)4 (1) and [Cr2(IPHTA)(Me2phen)4](NO3)4 (2) were further characterized by variable temperature magnetic susceptibility (4~300 K) measurements and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator, _ _ _ H JS S = Ĺ 2 1 2, giving the exchange integrals J = -1.27 cm-1 for (1) and J = -2.19 cm-1 for (2). This result indicates the presence of weak antiferromagnetic spin-exchange interaction between the metal ions within each molecule.

11

Synthesis and magnetic Properties of mi-2-Nitroterephthalato-Bridged Binuclear Lanthanide(III) Complexes

80%

Li Y. , Zhang J. , Yan C. W.

Polish Journal of Chemistry

|

2003

|

tom Vol. 77 / nr 7

797-804

EN

Nine new binuclear lanthanide(III) complexes described by the overall formula [Ln2(NTPHA)(Me2bpy)4(ClO4)2](ClO4)2 (Ln = La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er), where Me2bpy stands for 4,4_-dimethyl-2,2_-bipyridine, and NTPHA represents the 2-nitroterephthalate dianions, have been synthesized and characterized by elemental analyses, IR, ESR and electronic spectra, and molar conductance measurements. It is proposed that these complexes present NTPHA-bridged structures consisting of two lanthanide(III) ions. The variable-temperature magnetic susceptibilities (4~300 K) of complex [Gd2(NTPHA)(Me2bpy)4(ClO4)2](ClO4)2 were measured and studied, demonstrating a very weak antiferromagnetic spin-exchange interaction between Gd(III)-Gd(III) ions within the complex. Based on the spin Hamiltonian operator,_ _ _ H = 2JS S 1 Ĺ 2, the exchange parameter (J) was evaluated as -0.12 cm-1.

12

Synthesis, Characterization, and SOD-like Activity Testing of Two Novel Copper(II) Complexes Bridged by Oxamide-N,N'-diacetic Acid

80%

Zhang L. , Ma S. L. , Shen A.-Y. , Fu M. , Zhang L. J. , Liu X.

Polish Journal of Chemistry

|

2003

|

tom Vol. 77 / nr 7

837-844

EN

To provide more complexes which are expected to yield better similarity to authentic SOD (Superoxide Dismutase) and to have certain SOD activity, two novel 1 D linear complexes composed of binuclear copper(II) units are synthesized and characterized with the structural units bridged by oxamide-N,N_-diacetic acid. They are {Na[Cu2(oxaa)OAc]_H2O}n (I) and {Na[Cu2(oxaa)(o-phenylenediamine)2OAc]_2.5H2O}n (II), where oxaa denotes oxamide-N,N_-diacetic acid tetraanion. The temperature dependence of the magnetic susceptibilities of {Na[Cu2(oxaa)(o-phenylenediamine)2OAc]_2.5H2O}n was investigated between 4.99-299 K, giving the exchange parameter J = -294.1 cm-1. This result is demonstrated with an antiferromagnetic interaction between the adjacent copper(II) centers. In addition, the SOD-like activity of the complex (II) is discussed.

13

Non-Symmetrical Nickel(II)dithiocarbamates with NiS2P2-Chromophore

80%

Pastorek R.

Polish Journal of Chemistry

|

2002

|

tom Vol. 76 / nr 11

1545-1551

EN

Non-symmetrically substituted Ni(II)dithiocarbamate complexes with NiS2P2 chromophore of composition [Ni(bziprdtc)(PPh3)2]X, [Ni(bziprdtc)(PPh3)2]BPh4_3H2O (bziprdtc- = benzylisopropyldithiocarbamate, PPh3 = triphenylphosphine, BPh4 _ = tetraphenylborate, X = ClO4 _ , PF6 _ ), [Ni(cetdtc)(PPh3)2]X, [Ni(cetdtc)(PPh3)2]PF6, [Ni(cetdtc)(PBut3)2]X (cetdtc- = cyclohexylethyldithiocarbamate, PBut3 = tributylphosphine, X = ClO4 _ , BPh4 _ ) have been isolated. These complexes have been characterized by elemental analysis, IR and UV-VIS spectroscopy, thermal analysis, magnetochemical and conductivity measurements. X-ray structural analysis of [Ni(bziprdtc)(PPh3)2]ClO4_0.5H2O confirms the NiS2P2 chromophore with a slightly distorted square arrangement around the central atom.

14

Target-oriented Petri Net Synthesis

80%

Best E. , Devillers R. , Erofeev E. , Wimmel H.

Fundamenta Informaticae

|

2020

|

tom Vol. 175, nr 1-4

97--122

EN

When a Petri net is synthesised from a labelled transition system, it is frequently desirable that certain additional constraints are fulfilled. For example, in circuit design, one is often interested in constructing safe Petri nets. Targeting such subclasses of Petri nets is not necessarily computationally more efficient than targeting the whole class. For example, targeting safe nets is known to be NP-complete while targeting the full class of place/transition nets is polynomial, in the size of the transition system. In this paper, several classes of Petri nets are examined, and their suitability for being targeted through efficient synthesis from labelled transition systems is studied and assessed. The focus is on choice-free Petri nets and some of their subclasses. It is described how they can be synthesised efficiently from persistent transition systems, summarising and streamlining in tutorial style some of the authors’ and their groups’ work over the past few years.

15

An Improved Synthesis of Trisodium (R)-Homocitrate from Citric Acid

80%

Prokop M. , Milewska M. J.

Polish Journal of Chemistry

|

2009

|

tom Vol. 83, nr 7

1317-1322

EN

A method of synthesis of trisodium (R)-homocitrate starting from citric acid is reported. The procedure af fords the final product of high optical purity with satisfactory yield.

16

Copper(I) Nitrate P-Complexation : Synthesis and Crystal Structure of [{CH2=CH-CH2-NHC(NH2)2}Cu(NO3)2] Compound

80%

Filinchuk Y. , Mys'kiv M.

Polish Journal of Chemistry

|

2000

|

tom Vol. 74, nr 7

927-933

EN

By alternating-current electrochemical synthesis, a crystalline P-complexe has been obtained using copper(II) nitrate and allylguanidine in butanol-2 solution and copper-wire electrodes. A single crystal of the compound was X-ray structurally characterized.

17

Synthesis and characterization of substituted bisbenzoxazine as potent antimicrobial agent

80%

Lalcheta K. R. , Dhaduk D. D. , Mendapara J. P.

International Letters of Chemistry, Physics and Astronomy

|

2015

|

tom Vol. 40

73--80

EN

Bisbenoxazines derivatives were synthesized by refluxing substituted bisphenol-C, substituted aniline and formaldehyde in presence of 1,4-dioxane with good yields. All the synthesized compounds were characterized by mass, NMR and IR and also evaluated for antimicrobial activity against four different bacterial and two fungal strains. The compounds 1c, 1h, 1j and 1l has found comparatively good active against all the bacterial strains.

18

Complexes of iron(III) salen and saloph Schiff bases bridges by dicarboxylic acids

80%

Kopel P. , Sindelar Z. , Biler M. , Klicka R.

Polish Journal of Chemistry

|

1998

|

tom Vol. 72, nr 9

2060-2066

EN

Six dinuclear Fe(III) complexes involving tetradentate Schiff bases N,N'-bis(salicylidene)ethylenediamine (salenH2) or bis(salicylidene)o-phenylenediamine (salophH2) with 2,6-pyridinedicarboxylic acid (2,6-dicarpyH2), thiodiglycolic acid (tdgaH2) or 3,3'-thiodipropionic acid (3,3'-tdpaH2) have been synthesized and characterized by elemental analysis, IR spectroscopy and conductivity measuremenys. The magnetic behavioral of all complexes has been studied between 77-298 K. The dicarboxylic acids form bridges between paramagmetic centers and weak antiferromagnetic intramolecular exchanges were found. Thus, the complexes can be characterized as high spin distorted octahedral iron(III), except for [{Fe(saloph)}2(2,6-dicarpy)], where S1 = S2 = 3/2 spin-exchange model complies best with experimental data and the iron(III) has probably aquare-pyramidal coordination mode. The HDW S1 = S2 = 5/2 spin-exchange model with (H = -2S1S2) was applied in the case of the other complexes. The antiferromagnetic coupling parameters J vary in the range of -1.06 to -5.87 cm(-1).

19

Synthesis and magnetism of binuclear iron (II) complexes bridged by terephthalato dianions

80%

Li Y. T. , Yan C. W. , Liao D. Z.

Polish Journal of Chemistry

|

1998

|

tom Vol. 72, nr 5

832-838

EN

Four new terephthalato-bridges iron(II) binuclear complexes of the formula [Fe2(TPHA)L4](ClO4)2, where L stands for 4,4'-dimethyl-2,2'-bipyridine (Me2bpy); 2,9-dimethyl-1,10-phenanthroline (Me2phen); 5-bromo-1,10-phenanthroline (Br-phen); 5-chloro-1, 10-phenanthroline (Cl-phen), respectively, and TPHA represents the terephthalate dianion, have been synthesized and characterized. Based on the elemental analyses, molar conductance and magnetic moments of room-temperature measurements, and spectroscopic studies, extended TPHA-bridged structures consisting of two iron(II) ions, each in an octahedral environment are proposed for these complexes. The [Fe2(TPHA)(Me2bpy)4](ClO4)2 (1) and [Fe2(TPHA)(Me2phen)4](ClO4)2 (2) complexes were characterized by variable temperature magnetic susceptibility (4-300K) measurements and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator, H=-2JS-1xS-2, giving the exchange integrals J=-2.15 cm -1 for (1) and J=-3.28 cm-1 for (2). This result indicates the presence of a weak antiferromagnetic spin-exchange interaction between the metal ions within each molecule.

20

Nová syntéza o společnosti v českých zemích v dlouhém 19. století

80%

Hlavačka M.

Český časopis historický (The Czech Historical Review)

|

2021

|

tom 119

|

nr 1

135-148

EN

The new social history of the Czech lands in the 19th century is written on the basis of the concept of history as games, where however an analysis is not lacking of the structural framing of society, rhythm of historical movement, relationship between the continuity and discontinuity of modernisation changes, relationship between historical stability and dynamics and where Czech lands are presented as a unique “laboratory” of these modernisation changes. The author overcame the classical concept of modernisation by drawing into this general concept the value frameworks (especially the values associated with the Enlightenment, liberalism and nationalism), as well as new trends of that time (gender, social issues or the emancipation of the labouring class), which modernization inevitably or inadvertently created, and then especially his imagination.