Synthesis, solid state characterization and thermal behaviour of some t-butylammonium polymolybdates (original) (raw)
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Coordination polymers based on mixed carboxylate ligands: synthesis and thermal studies
Communications Faculty Of Science University of Ankara Series B Chemistry and Chemical Engineering, 2018
The synthesis of Co(II), Cu(II), Fe(II) and Zn(II) based coordination compounds using terephthalic acid (BDC), tartaric acid (DHB), and 4hydroxybenzoic acid (4-HBA) as ligands by a solvent-based and solvent-free methods were reported. Thermal studies of the complexes performed in the temperature range of 30 ºC-950 °C showed a 9.406% weight loss observed between 200 ºC-517 ºC for [Co(DHB)(4-HBA)] complex, and a 1.883 % weight loss observed between 80 ºC-352.68 ºC for [Cu(DHB)(4-HBA)] complex.
Journal of the Chinese Advanced Materials Society, 2015
ABSTRACT New three coordination polymers of d10 transition metals such as Zn(II), Cd(II), and Hg(II) with nitrogen containing multidentate ligand fumaroyl bis (paramethoxyphenylcarbamide) (fbpmpc) were synthesized using aprotic solvent including dimethylformamide (DMF) and mixture of dimethylformamide-ethanol (DMF/EtOH). Further, to confirm the structures of synthesized compounds they were characterize by elemental analysis and several spectroscopic techniques such as Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and magnetic moment susceptibility. Apart from this, the electrical conductivities have been investigated in solid state powder form. Moreover, coordination polymers were effectively investigated by thermogravimetry (TG), derivative thermogravimetry (DTG) and differential thermal analysis (DTA). Thermogravimetric analysis noteworthy inferred the presence of lattice water in the composition of all the polymers, also it was supported by infrared spectroscopy and elemental analysis. Above spectral investigation infer that ligand coordinated to metal atom in polymer compounds via bis (bidentate) mode by N-O and O-N donors system. Therefore, on the basis of the spectral, magnetic moment and thermogravimetric studies suggested tetrahedral geometry for all the metal coordination polymers.
Journal of the Chinese Advanced Materials Society, 2015
A few coordination polymeric assemblies of the type {[M(dddinh)(H 2 O) 2 ].xH 2 O} n (where M D Mn(II), Ni(II), and Cu(II), x D 2; and Co(II), x D 0, with (N 0 ,N 00 E,N 0 , N 00 E)-N 0 ,N 00 -(1,2-diphenylethane-1,2diylidene) diisonicotino-hydrazide (dddinh)) have been synthesized and characterized by using various spectroscopic techniques such as elemental analysis, Fourier transform infrared (FTIR), diffuse reflectance spectra, magnetic measurements and thermo gravimetric analysis. Magnetic moment and reflectance spectral studies reveal that an octahedral geometry was assigned to all the prepared coordination polymers. Each metal ion is coordinated by a bis (bidentate) manner through oxygen atom of carbonyl group and the nitrogen atom of amide group of ligand and two aqua ligands by coordinated bond which formed five-member heterocyclic ring. The decomposition steps and thermal stability of these coordination polymers were studied by using thermal analysis techniques. The thermal stabilities of coordination polymers are explained on the basis of release of coordinated water and decomposition of backbone structure (ligand). The thermal studies inferred the presence of crystallized water in all coordination polymers except Co(II), whereas coordinated water was found in all polymers.
Journal of the Chinese Advanced Materials Society, 2014
Terephthalaldehyde bis (S-methyldithiocarbazate) (tbsmdtc) new dithiocarbazate containing nitrogenÀsulphur donor ligand derived from reaction of S-methyl dithiocarbazate with terephthaladehyde. Four divalent transition metal coordination polymer of Mn(II), Co(II), Ni(II) and Cu(II) were synthesized by condensation of chelating ligand (tbsmdtc) with metal acetate in dimethylformamide medium. The synthesized coordination polymers were further characterized by elemental analyses, Fourier transform-infrared (FT-IR), diffuse reflectance, magnetic moment measurements and thermal studies. Each metal ion is coordinated through the sulphur atom of thiocarbazate group and nitrogen atom of azomethine group of ligand, forming a fivemember heterocyclic ring. Mn(II), Co(II) and Cu(II) coordination polymers were found octahedral geometry, while Ni(II) as square planner. The thermal properties of coordination polymers were evaluated by thermogravimetryÀdifferential thermal analysis techniques and their physical properties including solubility, colour and melting point were investigated, and the result showed insolubility in common organic solvents.
Journal of Saudi Chemical Society, 2014
The four chelate polymer complexes commonly called as coordination polymers of Mn(II), Co(II), Ni(II) and Cu(II) ions with fbpmpc (fbpmpc = fumaroyl bis (paramethoxyphenylcarbamide)) were synthesized and characterised by elemental analyses, infrared spectroscopy, diffuse reflectance, magnetic moment susceptibility, thermal analysis, X-ray diffraction, electrical conductivity and scanning electron microscopy technique (SEM). SEM investigations of coordination polymers were found in different shapes and sizes, though they are synthesized from a single ligand. Each metal ion is coordinated by a bis (bidentate) manner through oxygen atom of the carboxylato group and the nitrogen atom of an amide group of ligand and two aqua ligands by coordinated
2011
Department of Chemistry, Faculty of Science, Assiut University, Assiut, Egypt<br> E-mail : ghandour10@hotmail.com Fax : 0020-88-234270~<br> Manuscript received 22 April 2010, revised 15 March 2011, accepted 30 March 2011 A series of coordination polymers of the general formula [M(CAR)(ABZ)(H<sub>2</sub>0)].xH<sub>2</sub>0 (M = Cu<sup>II</sup>, Cd<sup>II</sup> and<br> Pb<sup>II</sup>; CAR = BDC (1,4-benzenedicaroxylate) or FDC (1,1'-ferrocenedicarboxylate); ABZ = 2-aminobenzothiazole and<br> x = 0 or 2) has been prepared and characterized. The structure of the complexes has been assigned based on elemental<br> analysis, IR and electronic spectral, thermal analysis, scanning electron microscope and cyclic voltammetric studies.<br> Thermogravimetry (TG), differential thermogravimetry (DTG) and differential thermal analysis (DTA) have been used<br> to study the thermal decomposition...
Inorganic Chemistry, 2007
New polynuclear coordination species containing the ditopic bis(1-imidazolyl)methane (Bim) ligand have been prepared as microcrystalline powders and structurally characterized by ab initio X-ray powder diffraction methods. [Zn(CH 3 -COO) 2 (Bim)] n contains 1D chains with tetrahedral metal atoms bridged by Bim ligands; [CdBr 2 (Bim)] n shows a dense packing with hexacoordinated Cd(II) ions and µ-Br and µ-Bim bridges; at variance, the isomorphous [ZnCl 2 -(Bim)] n and [ZnBr 2 (Bim)] n species contain cyclic dimers based on tetrahedral Zn(II) ions. Thermodiffractometric analysis allowed estimation of the linear thermal expansion coefficients and strain tensors derived there from. Bim-rich phases, with 2:1 ligand-to-metal ratio, were also isolated: ZnBr 2 (Bim) 2 (H 2 O) 3 and [Cd(CH 3 COO) 2 (Bim) 2 ] n containing cis and trans MN 4 O 2 chromophores, respectively, show 1D polymers built upon M 2 Bim 2 cycles, hinged on the metal ions. In all species the conformation of the Bim ligands is C s (or nearly so), while in the few sparse reports of similar coordination polymers the alternative C 2 one was preferentially observed.
Macromolecules, 1991
Poly(butanethiooxamide) has been synthesized by condensation of dithiooxamide and 1,4diaminobutane. Its complexes have been prepared with Co(II), Ni(II), and Cu(I1) salts. The complexes were characterized by elemental analyses, IR spectra, and thermogravimetric analyses and have been proposed to have an aromatized coordination structure. dc conductivity of the coordination polymers shows them to be electrically conductive, in comparison to the uncoordinated polymer. Thermal stability data of coordination polymers have been discussed. It shows an entirely different behavior from the degradation pattern of the ligand.