Authors:Mihaela Badea, Rodica Olar, Dana Marinescu, Veronica Lazar, Carmen Chifiriuc, and Gina Vasile
This paper reports the investigation on the thermal stability of new complexes with mixed ligands of the type [Cd(NN)(C3H3O2)2(H2O)m]·nH2O [(1) NN: 1,10-phenantroline, m = 1, n = 0; (2) NN: 2,2′-bipyridine, m = 0, n = 1.5 and (C3H3O2): acrylate anion]. The IR data indicate a bidentate coordination mode for both heterocyclic amine and acrylate. The in vitro
qualitative and quantitative antimicrobial activity assays showed that the complexes exhibited variable antimicrobial activity
against planktonic as well as biofilm embedded Gram-negative (Escherichiacoli, Klebsiella sp., Proteus sp., Salmonella sp., Shigella sp., Acinetobacterboumani, Pseudomonasaeruginosa), Gram-positive (Bacillussubtilis, Staphylococcusaureus) and fungal (Candida albicans) strains, reference and isolated ones from the hospital environment. The thermal behaviour steps were investigated
in synthetic air flow. The thermal transformations are complex processes according to TG and DTA curves including dehydration,
amine as well as acrylate thermolysis. The final products of decomposition are the most stable metal oxides.
TG and DTA of the compounds Mn(phen)2X2 (where X=CN−,CNO−, NCS− and NCSe−), Mn(phen) (NCS)2, Mn(NCS)2 and Mn(NCSe)2 (wherephen=1,10 phenanthroline) are reported and discussed. Decomposition schemes are proposed based on TG and DTA results and, where possible, the analysis and properties of intermediates formed during thermal breakdown. The decomposition of thiocyanate and selenocyanate ligands is observed to lead to an apparent slight increase in sample weight. This phenomenon is discussed in relation to buoyancy changes resulting from the release of sulphur or selenium vapours.
Authors:A. Czylkowska, D. Czakis-Sulikowska, A. Kaczmarek, and M. Markiewicz
,10-phenantroline, 2,2′-bipyridine and 4,7-diphenyl-1,10-phenantroline). Hart and Laming [ 29 ] described synthesis of complexes Ln(2-bpy)X 3 · n H 2 O where Ln(III) = La, Pr, Ce, Nd, Sm, Eu, Dy, Er; X = chloroacetates. Kokonov et al. [ 30 ] characterized thermal
Authors:Mihaela-Ligia Ungureşan, Andrada Măicăneanu, Francisc-Vasile Dulf, Eva-Henrietta Dulf, and Delia Maria Gligor
spectrophotometer, ortho -phenantroline, λ = 510 nm and ammonium solution, λ = 440 nm, respectively, according to standard methodologies (STAS 8634-70, SR ISO 6332-96, STAS 7795-80).
Results and discussions
The numerical method has to be
Authors:Annamária Krajníková, Katarína Győryová, Jana Kovářová, Daniela Hudecová, Jana Hubáčková, Faten Nour El-Dien, and Marián Koman
characterized [ 14 – 16 ]. Until now from 4-bromobenzoatozinc(II) complexes, only three complexes (without additional ligand [ 17 ], with diethylnicotinamide [ 15 ] or phenantroline [ 18 ]) were prepared and their structure have been solved. Neither their