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Rodica Olar Michaela Badea E. Cristurean C. Parnau D. Marinescu 《Journal of Thermal Analysis and Calorimetry》2006,84(1):53-58
The complexes of the type M(HDMBG)2(CH3COO)2·nH2O ((1)
M:Mn, n=1.5; (2)
M:Ni, n=0; (3)
M:Cu, n=2; (4)
M:Zn, n=2; DMBG: N,N-dimethylbiguanide)
present in vitro antimicrobial activity. The thermal analysis has evidenced
the thermal intervals of stability and also the thermodynamics effects that
accompany them. The different nature of the ligands generates a different
thermal behaviour for the complexes. The thermal transformations are complex
processes according to TG and DTG curves including dehydration, oxidative
condensation of –C=N– units as well as thermolysis processes.
The final products of decomposition are the most stable metal oxides. 相似文献
2.
Stephan Schaumüller Doris Cristurean Stephan Haudum George S. Pappas Markus Himmelsbach Matthias Bechmann Oliver Brüggemann Ian Teasdale 《Journal of polymer science. Part A, Polymer chemistry》2021,59(24):3161-3166
We report a facile post-polymerization modification route to functionalized aromatic polyimides via Diels-Alder cycloaddition. Aromatic polyimides are important, versatile high-performance polymers; however, their structural diversity is restricted by the requirements of the step-growth polymerization. We prepared polyimides with alkynes in their main-chain as macromolecular dienophiles and quantitatively grafted tetraphenylcyclopentadienone based dienes. The resulting solution-processable, wholly aromatic polyimides show a considerable increase in surface area due to the induced conformational changes and bulky, rigid, and contorted molecular structures. The orthogonality of the reaction is exploited to insert functional groups, namely bromine and sulfonates, along the polymer backbone. In a further extension, the phenylene segments undergo cyclodehydrogenation to form nanographene segments within the polymer chains. The Diels-Alder cycloaddition onto polyimides is therefore demonstrated to be an effective, widely applicable route to tunable high-performance polymers with value-added functionality and thus considerable potential in a wide range of advanced materials. 相似文献
3.
Rodica
Olar Mihaela Badea Veronica Lazar Carmen Balotescu Elena Cristurean Dana Marinescu 《Journal of Thermal Analysis and Calorimetry》2007,88(2):323-327
N,N-Dimethylbiguanide derivatives (HDMBG)X, where X=CH3COO
(1), Cl (2)
and NO3 (3) respectively,
exhibit in vitro antimicrobial activity
on representative bacterial and fungal strains. The presence of N,N-dimethylbiguanidium
ion for all derivatives was evidenced by IR and 1H
NMR spectra. Thermal analysis gave information on their decomposition steps
and also on the accompanying thermodynamic effects. According to TG and DTG
curves processes as melting, oxidative degradation as well as oxidative condensation
of –C=N– units occur. The different nature of the anions results
different melting points. Paracyanide formation at various condensation degrees
was observed. 相似文献
4.
R. Olar M. Badea N. Stanica E. Cristurean D. Marinescu 《Journal of Thermal Analysis and Calorimetry》2005,82(2):417-422
Summary The investigations concerning the thermal behaviour of a series of Ni(II) and Cu(II) complexes of type [MLCln]·mH2O ((1) M:Ni, L:L(1), n=1, m=2; (2) M:Cu, L:L(2), n=1, m=2; (3) M:Ni, L:L(3), n=2, m=0; (4) M:Cu, L:L(3), n=1, m=2) are presented in this paper. The ligands L(1)-L(3) have been synthesised by template condensation of 1,2-diaminoethane
with formaldehyde and 2-amino-1,3,4-thiadiazole-5-thiole or 2-acetamino-1,3,4-thiadiazole-5-sulfonamide. The bonding and stereochemistry
of the complexes have been characterised by IR, electronic and magnetic studies at room temperature. The thermal behaviour
provided confirmation of the complex composition as well as the number and the nature of water molecules and the intervals
of thermal stability. The different nature of the ligands and/or the metallic ions generates a different thermal behaviour
for complexes. The complexes do not show biological activity against HIV virus. 相似文献
5.
Badea M. Olar R. Cristurean E. Marinescu D. Brezeanu M. Balasoiu M. Segal E. 《Journal of Thermal Analysis and Calorimetry》1999,58(1):103-111
This paper reports an investigation of the thermal stabilities of the class of coordination compounds containing lanthanide ions Ln(III) (Ln=La, Sm, Eu, Dy, Er), Co(II) ions and oxalate anions C2O
4
2–
. The thermal decomposition steps were identified, and in some cases the values of the non-isothermal kinetic parameters were determined.This revised version was published online in November 2005 with corrections to the Cover Date. 相似文献
6.
Thermal stability study of some azo-derivatives and their complexes,Part 2. New azo-derivative pigments and their Cu(II) complexes 总被引:1,自引:0,他引:1
Badea M. Olar R. Cristurean E. Marinescu D. Emandi A. Budrugeac P. Segal E. 《Journal of Thermal Analysis and Calorimetry》2004,77(3):815-824
This paper deals with the investigation concerning the thermal stability of two new azo-derivatives and their Cu(II) complexes
of type [Cu(L1)2] and, respectively, ((C4H9)4N)2[Cu(L2)2]. The thermal decomposition steps have been put in evidence. For the kinetically workable ones, the values of the activation
energy vs. conversion degree were determined.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
7.
Badea Michaela Emandi Ana Marinescu Dana Cristurean Elena Olar Rodica Braileanu Ana Budrugeac P. Segal E. 《Journal of Thermal Analysis and Calorimetry》2003,72(2):525-531
this paper deals with the first investigation concerning the thermal stability of two 1-(2-benzothiazolyl)-3-methyl-4-azo-pyrazil-5-one
derivatives and their Cu(II) coordination compounds of type ((C4H9)4N)2[Cu(L)2]. The thermal decomposition steps were established.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
8.
P. Spacu Constanta Gheorghiu und Elena Cristurean 《Fresenius' Journal of Analytical Chemistry》1965,210(6):436-438
Zusammenfassung Es wird eine photocolorimetrische Methode zur Bestimmung von Atebrin mit Natriumchlorit bei pH 5,5–6 (
max=485 nm) beschrieben. Das Lambert-Beersche Gesetz wird zwischen den Konzentrationsgrenzen 0,2 und 1,4 mg/10 ml befolgt. Die Methode wurde sowohl für reines Atebrin als auch für Atebrintabletten angewandt.
VI. Mitt.: Spacu, P., C. Gheorghiu u. I. Paralescu: diese Z. 195, 321 (1963). 相似文献
Summary Sodium chlorite has been employed as a reagent for the photocolorimetric determination of atebrin (pH 5.5–6, max=485 nm). Lambert-Beers's law is obeyed within the range of 0.2 to 1.4 mg/10 ml. The method has been applied to pure atebrin and to atebrin tablets.
VI. Mitt.: Spacu, P., C. Gheorghiu u. I. Paralescu: diese Z. 195, 321 (1963). 相似文献
9.
M. Badea R. Olar E. Cristurean D. Marinescu M. Brezeanu C. Calina-Soradi E. Segal 《Journal of Thermal Analysis and Calorimetry》2000,59(3):977-984
Data concerning the thermal behaviour of four heteropolynuclear compounds with the general formula [CuML(CH3COO)3] whereM=Ni(II), Zn(II), Mn(II) and Co(II); LH=2-amino-5-mercapto-1,2,3-thiadiazole were obtained. For the kinetically workable decomposition steps the values of the kinetic
parameters were estimated.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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