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1.
Some new acrylate complexes as a criterion in their selection for further co-polymerization reaction
M. Badea R. Olar D. Marinescu G. Vasile 《Journal of Thermal Analysis and Calorimetry》2005,80(3):683-685
Summary This paper reports the investigation of the thermal stability of a series of new complexes with mixed ligands of the type M(phen)(C3H3O2)2(H2O)y ((1) M=Mn, y=0; (2) M=Ni, y=2; (3) M=Cu, y=1; (4) M=Zn, y=2; phen=phenanthroline and C3H3O2 is acrylate anion). The thermal behaviour steps were investigated. The thermal transformations are complex processes according to TG and DTG curves including dehydration, oxidative condensation of acrylate and thermolysis processes. The final products of decomposition are the most stable metal oxides. 相似文献
2.
Mihaela Badea Rodica Olar Dana Marinescu E. Segal A. Rotaru 《Journal of Thermal Analysis and Calorimetry》2007,88(2):317-321
A series of new complexes with mixed ligands
of the type M(4,4’-dipy)(C3H3O2)2(H2O)y ((1) M=Mn, y=2; (2) M=Ni, y=2; 4,4’-dipy: 4,4’-dipyridyl and C3H3O2 is acrylate anion) and respectively M2(4,4’-dipy)(C3H3O2)4(H2O)y
((3) M=Cu, y=0; (4) M=Zn, y=1). The
modification evidenced in IR spectra was correlated with the presence of acrylate
ion as unidentate in the case of complex (1)
and as bidentate for others complexes. The electronic reflectance spectra
showed the d–d
transition for complex (1) and (2) characteristic for the octahedral surrounding while
the spectrum for complex (3) have the characteristic
pattern for square-pyramidal stereochemistry. The thermal behaviour steps
were investigated. The thermal transformations are complex processes according
to TG and DTG curves including dehydration, acrylate ion oxidative degradation
and thermolysis process of aromatic amine. The final products of decomposition
are the most stable metal oxides. 相似文献
3.
Mihaela Badea Rodica Olar Dana Marinescu Gina Vasile 《Journal of Thermal Analysis and Calorimetry》2008,92(1):209-214
A series of new complexes with mixed ligands of the type [ML(C3H3O2)2]·nH2O (((1)
M=Mn, n=1; (2)
M=Co(II), n=2; (3)
M=Ni(II), n=4; (4)
M=Cu(II), n=1.5; (5)
M=Zn(II), n=0; L=3-amino-1,2,4-triazole and (C3H3O2)=acrylate anion) were synthesized and characterised by chemical analysis and IR data. In all complexes the 3-amino-1,2,4-triazole
acts as bridge while the acrylate acts as bidentate ligand except for complex (5) where it is found as unidentate. The thermal behaviour steps were investigated in nitrogen flow. The thermal transformations
are complex processes according to TG and DTG curves including dehydration, acrylate ion and 3-amino-1,2,4-triazole degradation
respectively. The final products of decomposition are the most stable metal oxides, except for complex (4) that leads to metallic copper. 相似文献
4.
Mihaela Badea Rodica Olar Dana Marinescu Gina Vasile 《Journal of Thermal Analysis and Calorimetry》2008,92(1):205-208
This paper reports the investigation of the thermal stability of a series of new complexes with mixed ligands of the type
[M(en)(C3H3O2)2]·nH2O ((1) M=Ni, n=2; (2) M=Cu, n=0; (3) M=Zn, n=2; en=ethylenediamine and (C3H3O2)=acrylate anion). The thermal behaviour steps were investigated in a nitrogen flow. The thermal transformations are complex
processes according to TG and DTA curves including dehydration, ethylenediamine elimination as well as acrylate thermolysis.
The final products of decomposition are the most stable metal oxides except for complex (2) that generates metallic copper. 相似文献
5.
Mihaela Badea Rodica Olar Dana Marinescu Veronica Lazar Carmen Chifiriuc Gina Vasile 《Journal of Thermal Analysis and Calorimetry》2009,97(2):781-785
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 (Escherichia coli, Klebsiella sp., Proteus sp., Salmonella sp., Shigella sp., Acinetobacter boumani, Pseudomonas aeruginosa), Gram-positive (Bacillus subtilis, Staphylococcus aureus) 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. 相似文献
6.
Summary Compounds crystallizing from theMOH-HF-V2O5-H2O2-H2O (M=N(CH3)4, N(C2H5)4, N(C4H9)4) system have been characterized by elemental analysis, vibrational spectra, and X-ray powder patterns. Besides [N(CH3)4]2[VO(O2)2F]·2H2O (1) and [N(CH3)4]3[V2O2(O2)4F] (2) which correspond to the known compoundsM
2[VO(O2)2F] (M=K, NH4, Cs) and (NH4)3[V2O2(O2)4F]·2H2O, respectively, complexes of two new types have been obtained: [N(C2H5)4]2[V2O5–x
(O2)
x
F2]·H2O(x0.25,3) and the first trinuclear peroxo complex of vanadium(V), [N(C4H9)4]2[V3O3(O2)4F3]·6H2O(4).
Tetraalkylammonium-Fluorooxoperoxovanadate
Zusammenfassung Aus dem SystemMOH-HF-V2O5-H2O2-H2O (M=N(CH3)4), N(C2H5)4, N(C4H9)4) kristallisierende Verbindungen wurden mittels Elementaranalyse, Schwingungsspektroskopie und Röntgendiffraktion charakterisiert. Neben [N(CH3)4]2[VO(O2)2F]·2H2O (1) und [N(CH3)4]3][V2O2(O2)4F] (2), welche den bekannten VerbindungenM 2[VO(O2)2F] (M=K, NH4, Cs) und (NH4)3[V2O2(O2)4)F]·2H2O entsprechen, wurden zwei neue Typen von Komplexen erhalten: [N(C2H5)4]2[V2O5–x (O2) x F2]·H2O (x0.25,3) und der erste dreikernige Peroxokomplex von Vanadium(V), [N(C4H9)4]2[V3O3(O2)4F3]·6H2O (4).相似文献
7.
Peter Švančárek Peter Schwendt Jozef Tatiersky Ivana Smatanová Jaromír Marek 《Monatshefte für Chemie / Chemical Monthly》2000,131(2):145-154
Summary. Oxo peroxo glycolato complexes of vanadium(V) (M
2[V2O2(O2)2(C2H2O3)2]ċnH2O (n=0, 1; M=NBu4
+ (1), K+ (2), NH4
+ (3), Cs+ (4), NPr4
+ (5)) as well as (NBu4)2[V2O4(C2H2O3)2]ċ H2O (6) have been prepared and characterized by spectroscopic methods. X-Ray structure analysis of 1 revealed the presence of dinuclear [V2O2(O2)2(C2H2O3)2]2− anions with a (chemical structure) bridging core and six coordinated vanadium(V) atoms in a distorted pentagonal pyramidal
array.
Received July 12, 1999. Accepted (revised) October 28, 1999 相似文献
8.
Peter ?van?árek Peter Schwendt Jozef Tatiersky Ivana Smatanová Jaromír Marek 《Monatshefte für Chemie / Chemical Monthly》2000,35(4):145-154
Oxo peroxo glycolato complexes of vanadium(V) (M 2[V2O2(O2)2(C2H2O3)2]ċnH2O (n=0, 1; M=NBu4 + (1), K+ (2), NH4 + (3), Cs+ (4), NPr4 + (5)) as well as (NBu4)2[V2O4(C2H2O3)2]ċ H2O (6) have been prepared and characterized by spectroscopic methods. X-Ray structure analysis of 1 revealed the presence of dinuclear [V2O2(O2)2(C2H2O3)2]2− anions with a (chemical structure) bridging core and six coordinated vanadium(V) atoms in a distorted pentagonal pyramidal array. 相似文献
9.
Mihaela Badea Rodica Olar Gina Vasile Ana Emandi Veronica Pop Dana Marinescu 《Journal of Thermal Analysis and Calorimetry》2005,81(2):273-276
Summary This paper reports the investigation of the thermal stability of three new complexes of Cr(III) with acrylate anion, [Cr2(C3H3O2)4(OH)2(H2O)4], [Cr3O(C3H3O2)6(C3H4O2)3](C3H3O2)×5H2O and [Cr2(C3H3O2)5(OH)] ×2H2O, respectively. This type of complexes is important in proper carbohydrate and lipid metabolism of mammals. The thermal decomposition steps were evidenced. The thermal transformations are complex processes according to TG and DTG curves including dehydration and oxidative degradation of acrylate ion processes. The final product of decomposition is the chromium(III) oxide. 相似文献
10.
Cristiane Batista Gonçalves Maria Vanda Marinho Danielle Ferreira Dias Marcelo Henrique Dos Santos Felipe Terra Martins 《Journal of Coordination Chemistry》2017,70(5):898-913
Four mononuclear copper(II) complexes, [Cu(LFQM-115)2] (1), [Cu(LFQM-116)2] (2), [Cu(LFQM-117)2] (3) and [Cu(octyloxy)2] (4) [LFQM-115 = 2-hydroxy-4-O-methylbenzophenone (C14H11O3), LFQM-116 = 2-hydroxy-4-O-butylbenzophenone (C17H18O3), LFQM-117 = 2-hydroxy-4-O-(33-dimethylallyl)benzophenone (C18H18O3) and octyloxy = 2-hydroxy-4-O-octylbenzophenone (C21H25O3)], have been prepared and investigated by infrared spectroscopy, thermal analysis, and powder and single crystal X-ray diffraction. Even though the synthesis and infrared analysis of 1, 2, and 4 have been reported previously, their crystal structures were elucidated for the first time here. In addition, the crystal structures of LFQM-116 and LFQM-117 were also determined by single crystal X-ray diffraction. The pseudo-translational symmetry found in LFQM-116 and the isomorphism between LFQM-115 and LFQM-117 are discussed. The complexes were prepared from a reaction of copper(II) nitrate trihydrate and the respective ligand in a (1:2) molar ratio in methanol (for 1 and 2) or THF (for 3 and 4) with addition of NaOH. Furthermore, crystallographic studies show that each copper(II) exhibits a square planar geometry, coordinated by four oxygens of two ligands. The nature and crystal packing of the intermolecular interactions are discussed. Compounds 2 and 3 are isomorphic crystals and all structures have the same supramolecular synthon. 相似文献
11.
This paper reports the investigation of the thermal
stability of a series of new complexes with azo and azomethinic chromophores
of the type [Er(HL)2(H2O)2](HO);
((B) H2L: o,o’-dihydroxy-azobenzene (A);
(D) H2L: N-(2-hydroxy-1-naphthalidene)aminophenol
(C); (F)
H2L: N-(2-hydroxy-1-naphthalidene)anthranilic acid
(E)). The complexes thermal behaviour steps
were investigated and comparatively presented with those of corresponding
ligand. The thermal transformations are complex processes according to TG
and DTG curves including phenol elimination, oxidative condensation and thermolysis
processes. The final product of complexes decomposition is Er2O3. 相似文献
12.
Oscar E. Piro Gustavo A. Echeverría Roberto C. Mercader Ana C. González-Baró 《Journal of Coordination Chemistry》2016,69(24):3715-3725
A new general synthetic procedure for preparation of Na3[Fe(C2O4)3]·5H2O (1), Rb3[Fe(C2O4)3]·3H2O (2), and Cs3[Fe(C2O4)3]·2H2O (3) was developed. The crystal structures of these salts have been determined by single crystal X-ray diffraction. Salt 1 crystallizes in the monoclinic space group C2/c with Z = 8, salt 2 in P21/c with Z = 4, and salt 3 in P21/n with Z = 4. The three new salts and K3[Fe(C2O4)3]·3H2O, prepared for comparative purposes, were further characterized by infrared and 57Fe-Mössbauer spectroscopy. These spectra are discussed in comparison with those of related oxalato complexes. 相似文献
13.
Mohamed G. G. Nour El-Dien F. A. El-Gamel N. E. A. 《Journal of Thermal Analysis and Calorimetry》2002,67(1):135-146
The present work aims chiefly to study the thermal behaviour of complex compounds with general formula: [M(HL)xH2O](A)yH2O (where HL=C13H11N4O2=6-(2-pyridylazo)-3-acetamidophenol (PAAP), M=Cu(II), Zn(II), Cd(II) and Fe(III) x=1, 3; y=2, 5) while A=CH3COO– (Ac), Cl2. The second formula is [M(H2L)xH2O]Cl2yH2O, (where H
2
L=C13H12N4O2 (PAAP), M=Ni(II), Co(II) x=3; y=4, 6). The compounds were identified by elemental analysis, FT-IR spectra and TG/DTG,DTA methods. It was found that during the thermal decomposition of complex compounds water molecules of crystallization are released in the first step. In the next step the pyrolysis of organic ligand takes place. Metal oxide remained as a solid product of the thermal decomposition. Mass spectroscopy has been used for the determination of the thermal decomposition on the intermediate products. It was found that the thermal stability of the studied compounds increases as the ionic radii decreases. The activation energy E, the entropy change S
*, the enthalpy H
* change and Gibbs free energy change G
* were calculated from TG curve.This revised version was published online in November 2005 with corrections to the Cover Date. 相似文献
14.
Monojit Mitra Anowar Hossain Prankrishna Manna Somnath Ray Choudhury Surasak Kaenket Madeleine Helliwell 《Journal of Coordination Chemistry》2017,70(3):463-474
A Cu(II)-methylmalonate complex, (C3H7N6)4[Cu(II)(C4H4O4)2](H2O)4Cl2 (1) (where C3H7N6 = protonated melamine, C4H4O4 = methylmalonic acid), has been synthesized from aqueous media and its crystal structure was determined by single-crystal X-ray diffraction. The anionic Cu(II)-methylmalonate complex mediated formation of interesting supramolecular assemblies in the solid state by means of ionic interactions with protonated melamine. Moreover, other forces such as antielectrostatic H-bonding and π+–π+ interactions also play a crucial role in defining the final 3-D architecture of 1. An interesting stacking among protonated melamine molecules is studied by DFT calculations. Lattice water molecules and chlorides form various hydrogen bonds to take part in the self-assembly processes. 相似文献
15.
《Journal of Coordination Chemistry》2012,65(11):1951-1959
Two new mononuclear Ni(II) complexes, [Ni(C10H12O2N2)2(C5H5N)2](NO3)2 (1) and [Ni(C10H12O2N2)2(H2O)2](NO3)2 (2), have been synthesized and characterized by elemental analysis, infrared, UV-Vis spectroscopy, and single-crystal X-ray diffraction. The coordination geometry around each Ni(II) can be described as an octahedron with each Ni(II) coordinated to two imino nitrogens, two carbonyl oxygens, and two solvent molecules (pyridine for 1 and water for 2). In the synthesis, the original ligand changes from o-carboxybenzaldehyde salicyloylhydrazone (C15H12O4N2) into acetone salicyloylhydrazone (C10H12O2N2). The thermal stability of the complexes at three different heating rates (β = 5, 10, and 15°C min?1) show that all the complexes exhibit three thermal decomposition stages and their thermal stability is 1 > 2. Complexes 1 and 2 both display DNA binding ability, ascertained by UV-Vis titration. 相似文献
16.
The mechanochemical synthesis offers an easy access to obtain alkaline earth metal terephthalates M(C8H4O4) · nH2O (M = Ca, Sr, Ba). In the presented study we describe for the first time the mechanochemical synthesis of powders of Ca(C8H4O4) · 3H2O, Ca(C8H4O4), Sr(C8H4O4) · H2O, and Ba(C8H4O4), which so far were only synthesized as single crystals from aqueous solutions or by reactions in an autoclave. Furthermore, a new hydrate Ba(C8H4O4) · 2(1.5)H2O, not described so far in the literature, was prepared. All compounds were characterized by X‐ray powder diffraction, thermal analysis, elemental analysis, FT‐IR, and MAS NMR spectroscopic measurements. 相似文献
17.
O. E. Sherif Y. M. Issa M. E. M. Hassouna S. M. Abass 《Monatshefte für Chemie / Chemical Monthly》1993,124(6-7):627-635
Summary Solid complexes of 3-acetyl-1,5-diaryl and 3-cyano-1,5-diaryl formazans were prepared and characterized by elemental analysis, IR, NMR, TGA and DTA analyses. Based on these studies, the suggested general formula for the complexes is [M(HL)
m
(OH–)
n
or (NO
3
–
or Cl–)
x
·(H2O)
y
or (C2H5OH orDMSO)
z
, where HL=formazanM=Ce3+, Th4+, and UO
2
2+
,m=1–2,n=0–3,x=0–3,y=0–4 andz=0–3. The metal ions are expected to have coordination numbers 6–8.
Strukturuntersuchungen an 3-Acetyl-1,5-diaryl- und 3-Cyan-1,5-diaryl-formazan-Chelaten mit Cer(III), Thorium(IV) und Uran(VI)
Zusammenfassung Die hergestellten Chelate wurden mittels Elementaranalyse, IR, NMR, TGA und DTA charakterisiert. Darauf basierend wird die generelle Formel [M(HL) m (OH–) n bzw. (NO 3 – oder Cl–) x ·(H2O) y oder (C2H5OH bzw.DMSO) z ] vorgeschlagen, wobei HL=Formazan,M=Ce3+, Th4+ oder UO 2 2+ ,m=1–2,n=0–3,x=0–3,y=0–4 undz=0–3. Die Metallionen haben Koordinationszahlen von 6–8.相似文献
18.
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
19.
Sbai K. Abouimrane A. El Kababi K. Vilminot S. 《Journal of Thermal Analysis and Calorimetry》2002,68(1):109-122
We have studied the thermal behaviour under atmospheric pressure of isotypic tetrahydrate cyclotriphosphates MII(NH4)4(P3O9)2x4H2O (M
II=Cu, Ni and Co), between 25 and 1400°C, by X-ray diffraction, thermal analyses (TG and DTA) and infrared spectrometry. This
study shows that the series of the compounds MII(NH4)4(P3O9)2x4H2O (M
II=Cu, Ni and Co) after elimination of water, in two different stages, and ammonia leads, at 400°C to cyclotetraphosphate M2
IIP4O12 crystallized and to a thermal residue with a formula H4P4O12 which undergoes under a thermal degradation by evolving water and pentoxide phosphorus. The kinetic characteristics of the
dehydration and elimination of ammonia have been determinated. The vibrational spectra of Cu(NH4)4(P3O9)2x4H2O were examined and interpreted, in the domain of the valency frequencies, on the basis of the crystalline structure of its
isotypic compound Co(NH4)4(P3O9)2x4H2O whose cycle has the site symmetry C1, of our results of the calculation of the IR frequencies and the successive isotopic substitutions of the equivalent atoms
(3P, 3Oi and 6Oe belonging to the P3Oi3Oe6 ring) of the P3O9
3− cycle with high symmetry D3h.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
20.
A new compound,[RbHTNR]_∞[HTNR:C_6H(NO_2)_3(OH)O],was synthesized by the reaction of rubidium ni-trate and styphnic acid.The molecular structure was characterized using X-ray diffraction analysis,elementalanalysis and FTIR spectroscopy.The crystalline is monoclinic with space group P2_1/n and the empirical formulaC_6H_2N_3O_8Rb.The unit cell parameters are:a=0.4525 nm,b=1.0777 nm,c=1.9834 nm,β=90.47(2)°,V=0.96725 nm~3,Z=4,D_c=2.263 g/cm~3,Mr=329.58,F(000)=640,μ(Mo Kα)=5.165 mm~(-1).The thermal decompo-sition mechanism of the complex was studied by differential scanning calorimetry(DSC),thermogravimetry-derivative thermogravimetry(TG-DTG)and FTIR techniques.At the linear rate of 10 ℃/min,the thermaldecomposition of the complex showed three mass reducing processes between 60 and 500 ℃,and finally evolvedRbCN and some gaseous products. 相似文献