The novel metal complexes with ketoprofen. thermal and spectroscopy investigations

The novel metal complexes of ketoprofen (Hket)(1) with general formulae Mn(L)4(2), Co(L)4(3), Ni(L)4(4), and Zn(L)4(5) (where L= Hket, ket) were synthesized and characterized by elemental analysis, FTIR- spectroscopy and thermal decomposition techniques. All IR spectra revealed absorption bands related to the asymmetric (νas) and symmetric (νs) vibrations of carboxylate group. The Nakammoto criteria clearly indicate that this group is bonded in a bidentate-chelate mode. The thermal behavior of complexes was studied by TG, DTG methods under dynamic condition in air. Upon heating, all compounds decompose progressively to metal oxides, which are the final products of pyrolysis

Synthesis, Spectroscopic, and Thermal Investigations of Metal Complexes with Mefenamic Acid

The novel metal complexes with empirical formulae M(mef)2·nH2O (where M = Mn(II), Co(II), Ni(II), Cu(II), Zn(II), and Cd(II); mef is the mefenamic ligand) were synthesized and characterized by elemental analysis, molar conductance, FTIR-spectroscopy, and thermal decomposition techniques. All IR spectra revealed absorption bands related to the asymmetric (νas) and symmetric (νs) vibrations of carboxylate group. The Nakamoto criteria clearly indicate that this group is bonded in a bidentate chelate mode. The thermal behavior of complexes was studied by TGA methods under non-isothermal condition in air. Upon heating, all compounds decompose progressively to metal oxides, which are the final products of pyrolysis. Cu(II), Zn(II), and Cd(II) complexes were also characterized by the coupled TG-FTIR technique, which finally proved the path and gaseous products of thermal decomposition. Additionally, the coupled TG-MS system was used to determine the principal volatile products of thermolysis and fragmentation processes of Mn(mef)2·3H2O and Co(mef)2·2H2O

Laminate from modernized fuel tanks - waste of the future

W artykule przedstawiono hipotezę o zagrożeniach wynikających z likwidacji zbiorników paliwowych wyposażonych w wewnętrzny płaszcz wykonany z laminatu. Jedną z najczęściej stosowanych metod modernizacji zbiorników paliwowych jest wytwarzanie wielowarstwowej powłoki z kompozytów żywicznych i mat szklanych, nazywanych zwyczajowo laminatami. Wytworzenie drugiego płaszcza wewnątrz zbiornika stalowego zwiększa wytrzymałość jego ścianek i przyczynia się do ograniczenia korozji wewnętrznej. Powłoka z laminatu umożliwia również uzyskanie wymaganej przestrzeni do monitorowania szczelności, co zgodnie z Rozporządzeniem Ministra Gospodarki z dnia 18 września 2001 r. (Dz. U. Nr 113, poz. 1211) jest koniecznym warunkiem do dalszej eksploatacji zbiornika paliwowego. Można założyć, że intensywny wzrost liczby zbiorników jednopłaszczowych modernizowanych z wykorzystaniem technologii laminowania, wynikający z konieczności dostosowania ich do obowiązujących przepisów, a także specyfika stosowanych w tych technologiach materiałów i technika wytwarzania kolejnych warstw laminatu przyczyni się do powstania w przyszłości nowego odpadu. W związku z powyższym, zaistniała konieczność opracowania bezpiecznego i ekologicznego sposobu oddzielania laminatów od powłok stalowych nieeksploatowanych już zbiorników oraz odpowiednich metod skutecznej utylizacji tych powłok przesiąkniętych paliwem.The aim of the paper is to present the hypothesis of threats resulting from the disposal of fuel tanks equipped with the inside laminate coat. One of the practiced technologies used during fuel tanks modernization is the system of applications on their steel blanket (sheath) several layers cover made of resinous components and glass mates so called laminates. Creating the second blanket internal steel tank toughen strength of its walls, limits corrosion effect inside container and first of all enables obtaining its walls' monitored tightness. This is prerequisite to use fuel tank in the light of Minister of Economy's order dated of 18st October 2001. Let's assume that a sudden increase of single-blankets tanks modernized through laminates technologies caused by necessity to adjust them to the binding regulations and also the specificity of materials used in this techniques as well as the technology of applying laminate contributes to come into existence in the future a brand new hazardous (dangerous) waste. Therefore a query arises how should that be dealt with excluded from usage steel-laminates walls' tanks? The aim of this article is signalizing the necessity of working out safe and ecologic way to separate laminate and tanks steel layers and also create methods of effective utilization (recycling) this kind of layers saturated with fuel

Synthesis, Spectroscopic, and Thermal Investigations of Metal Complexes with Mefenamic Acid

The novel metal complexes with empirical formulae M(mef)2·nH2O (where M = Mn(II), Co(II), Ni(II), Cu(II), Zn(II), and Cd(II); mef is the mefenamic ligand) were synthesized and characterized by elemental analysis, molar conductance, FTIR-spectroscopy, and thermal decomposition techniques. All IR spectra revealed absorption bands related to the asymmetric (νas) and symmetric (νs) vibrations of carboxylate group. The Nakamoto criteria clearly indicate that this group is bonded in a bidentate chelate mode. The thermal behavior of complexes was studied by TGA methods under non-isothermal condition in air. Upon heating, all compounds decompose progressively to metal oxides, which are the final products of pyrolysis. Cu(II), Zn(II), and Cd(II) complexes were also characterized by the coupled TG-FTIR technique, which finally proved the path and gaseous products of thermal decomposition. Additionally, the coupled TG-MS system was used to determine the principal volatile products of thermolysis and fragmentation processes of Mn(mef)2·3H2O and Co(mef)2·2H2O

Synthesis, characterisation, crystal structure and biological activity of metal(II) complexes with theophylline

Three metal complexes with empirical formulae [Mn(theop)2(H2O)4] (1), [Co(theop)2(H2O)4] (2), [Ni(theop)2(H2O)4] (3), (where: theop = theophylline) were synthesized and characterized by elemental analysis, FTIR- spectroscopy and thermal decomposition techniques. Their crystal structures were determined by single crystal Xray diffraction analysis. Complexes are isomorphous and crystallise in the monocyclic space group P21/c. Their thermal behavior was studied by TGA methods under non-isothermal condition in air. Upon heating all compounds decompose progressively to metal oxides, which are the final products of pyrolysis. Furthermore, antimicrobial and antioxidant activity of the complexes was examined. Keywords: Metal complexes, Thermal investigation, IR spectra, Alkaloids, Theophylline, Antioxidant activity, Biological activit

Double Palindrome Water Chain in Cu(II) Theophylline Complex. Synthesis, Characterization, Biological Activity of Cu(II), Zn(II) Complexes with Theophylline

Two metal complexes of theophylline were synthesized. Namely, 1 with the formula [Cu(theop)2(H2O)3]·2H2O and 2, [Zn(theop)2]∙H2O (where: theop = theophylline ion). Their properties were thoroughly investigated by the elemental analysis (EA), flame atomic absorption spectrometry (FAAS), Fourier-transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA) that were augmented by antimicrobial and antioxidant analyses. Their radical scavenging ability (RSA) is notably higher than that of a pure theophylline itself. Similarly to theophylline complexes already studied by us 3, [Mn(theop)2(H2O)4] 4, [Co(theop)2(H2O)4] and 5, [Ni(theop)2(H2O)4] title compounds are inactive against Gram-negative bacteria, but they show moderate or mild activity against Gram-positive rods. The low temperature, single crystal X-ray diffraction technique determines the crystal structure of 1. Its supramolecular crystal topology is affected by the unique, double palindrome water chain that formed by two conserved and a sole coordinated water molecules. Crystal packing arrangements were characterized by fingerprint plots that were derived from the Hirshfeld surfaces (HS), as calculated for all structures in the series 1, 3, 4, 5