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1.
Two novel coordination polymers, namely {[Co(Ttac)0.5(1,4-Bib)(H2O)] · H2O}n (I) and {[La(HTtac)2(2H2O)] · H2O}n (II) (H4Ttac = 4,5-di(3'-carboxylphenyl)-phthalic acid, 1,4-Bib = 1,4-bis(1-imidazoly) benzene), have been designed and successfully prepared via hydrothermal process, and characterized by elemental analyses, IR spectroscopy, and single crystal X-ray diffraction (CIF files CCDC nos. 1039298 (I), 1039300 (II)). Structural analysis reveals that the H4Ttac ligands adopt different coordination modes in the as-synthesized I and II, and thus give rise to the targeted coordination polymers with different configurations. It is worth mentioning that, coordination polymer I is assembled from low-dimensional structures into three-dimensional (3D) via π···π stacking interactions, while three-dimensional coordination polymer II is formed by covalent bonds. Luminescent properties of coordination polymer II have been studied at ambient temperature. Significantly, luminescent measurement indicates that coordination polymer II may be acted as potential luminescent recognition sensors towards Cu2+ and Mn2+ ions. 相似文献
2.
M. K. Khosa P. T. Wood S. M. Humphrey W. T. A. Harrison 《Journal of Structural Chemistry》2015,56(6):1130-1135
The syntheses and crystal structures of the layered coordination polymers M(C8H8NO2)2 [M = Mn (1), Co (2), Ni (3) and Zn (4)] are described. These isostructural compounds contain centrosymmetric trans-MN2O4 octahedra as parts of infinite sheets; the ligand bonds to three adjacent metal ions in μ3-N,O,O′ mode from both its carboxylate O atoms and its amine N atom. In each case, weak intra-sheet N–H?O and C–H?O hydrogen bonds may help to consolidate the structure. Crystal data: 1, C16H16MnN2O4, M r = 355.25, monoclinic, P21/c (No. 14), a = 10.6534(2) Å, b = 4.3990(1) Å, c = 15.5733(5) Å, β = 95.1827(10)°, V = 726.85(3) Å3, Z = 2, R(F) = 0.026, wR(F 2) = 0.067. 2, C16H16CoN2O4, M r = 359.24, monoclinic, P21/c (No. 14), a = 10.6131(10) Å, b = 4.3374(4) Å, c = 15.3556(17) Å, β = 95.473(4)°, V = 703.65(12) Å3, Z = 2, R(F) = 0.041, wR(F 2) = 0.091. 3, C16H16N2NiO4, M r = 359.02, monoclinic, P21/c (No. 14), a = 10.6374(4) Å, b = 4.2964(2) Å, c = 15.2827(8) Å, β = 95.9744(14)°, V = 694.66(6) Å3, Z = 2, R(F) = 0.028, wR(F 2) = 0.070. 4, C16H16N2O4Zn, M r = 365.68, monoclinic, P21/c (No. 14), a = 10.6385(5) Å, b = 4.2967(3) Å, c = 15.2844(8) Å, β = 95.941(3)°, V = 694.89(7) Å3, Z = 2, R(F) = 0.038, wR(F 2) = 0.107. 相似文献
3.
Isothermal titration calorimetry has been used to determine the stoichiometry, formation constants and thermodynamic parameters
(ΔG
o, ΔH, ΔS) for the formation of the citrate complexes with the Mn2+, Co2+, Ni2+ and Zn2+ ions. The measurements were run in Cacodylate, Pipes and Mes buffer solutions with a pH of 6, at 298.15 K. A constant ionic
strength of 100 mM was maintained with NaClO4. The influence of a metal ion on its interaction energy with the citrate ions and the stability of the resulting complexes
have been discussed. 相似文献
4.
Four novel coordination polymers constructed from flexible pamoic acid, namely [Co(pam)(4,4′-bipy)]n·nH2O (1), [Ni(pam)(4,4′-bipy)(H2O)2]n·2nCH3CN (2), [Cd(pam)(py)2]n·npy (3) and [Mn2(pam)2(py)6(H2O)2]n·2npy (4), (H2pam = pamoic acid, 4,4′-bipy = 4,4′-bipyridine, py = pyridine), have been synthesized and characterized by elemental analysis, infrared spectra and X-ray crystallography. Complex 1 is a 2-D coordination polymer constructed from chelating bis-bidentate pam and 4,4′-bipyridine bridging ligands. Complex 2 is a 2-D coordination polymer assembled by bis-monodentate pam and 4,4′-bipyridine, where acetonitrile is filled in the rectangle channels. Both 2-D coordination polymers display undulated (4,4) grid layers as sql topology. Complex 3 displays a 1-D polymeric chain using chelating bis-bidentate pam as bridging ligand. Complex 4 exhibits an interesting bis-monodentate pam-Mn(II) 1-D polymeric chain, in which exist two-type six-coordinated manganese centers. Mn(1) is bound to four pyridine ligands, whereas Mn(2) is combined to two pyridine and two H2O molecules. Their thermal stabilities have been investigated. Cadmium complex 3 displays strong green luminescence with emission maximum at 543 nm. 相似文献
5.
V. I. Isaeva O. P. Tkachenko T. R. Brueva V. D. Nissenbaum I. V. Mishin W. Grünert L. M. Kustov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2011,85(3):462-465
Structural characteristics and adsorption properties of new heteroaromatic framework structures based on Zn2+ ions and 2,5-pyridinedicarboxylate ligands are investigated. A comparative study of the aromatic framework structure MOF-5
based on Zn4O clusters and 1,4-benzenedicarboxylate ligands is also performed in order to reveal the effect of the nature of the organic
fragment. 相似文献
6.
V. A. Ismailova A. I. Yagubov F. T. Makhmudov N. M. Muradova M. A. Abbasov A. N. Nuriev 《Russian Journal of Applied Chemistry》2016,89(1):51-55
The patterns of static equilibrium sorption of Pb2+ and Mn2+ ions from solutions simulating a composition of industrial liquid waste, onto modified bentonite and zeolite were researched. Na-bentonite and Na-clinoptilolite demonstrate high sorption activity with respect to Pb2+ and Mn2+ ions are recommended instead of a commercial synthetic KU-2-8 for a sorption after-treatment of liquid wastes from toxic Pb2+ and Mn2+ ions. 相似文献
7.
P. Staszczuk M. Majdan S. Pikus D. Sternik M. Błachnio 《Journal of Thermal Analysis and Calorimetry》2008,94(3):655-662
Complex studies of physicochemical properties of pure and modified of aluminia oxides samples are presented. The presence
of Mn2+ and Ni2+ modifiers on the aluminium oxide surface causes increase in water adsorption capacity and decrease in benzene and n-octane adsorption. This is due to decrease of specific surface area, volume and radius of pores as a result of surface impregnation
and microcrystal formation during modification with manganese and nickel chlorides. Microcrystal formation on the surface
and porosity decrease as confirmed by AFM, EDX and powder diffraction studies using automated diffractometer by step scanning.
From the Q-TG and Q-DTG data, the energies of liquid desorption from the surface of the samples and the functions of desorption,
energy distribution were calculated. High degree of nonlinearity of the functions resulting from great heterogeneity of the
studied surface was found. Adsorption of cations creates more homogeneous surface in aluminium oxide, and it is responsible
for the change in adsorbate molecule interaction energy and changes mechanism of adsorption and desorption as well as thickness
and structure of the adsorbed film. From the experimental data some parameters characterizing adsorption properties and porosity
of the studied samples were determined using the complex measuring methods (thermal analysis, sorptometry, porosimetry, AFM
and EDX). 相似文献
8.
The efficiency of calcium and magnesium phosphates of different compositions in the extraction of Cu2+, Zn2, and Co2+ ions from aqueous solutions was studied. 相似文献
9.
Two new complexes, Zn(Glut)(Bix) · 2H2O (I) and Cd(Pda)(Bimb) (II) (H2Glut = glutaric acid, H2Pda = 1,3-phenylenediacetic acid, Bix = 1,4-bis(imidazol-1-ylmethyl)benzene and Bimb = 1,4-di(1H-imidazol-1-yl)butane) were obtained under hydrothermal conditions by employing mixed ligands with metal salts and characterized by elemental analysis, IR, TGA, and Single crystal X-ray diffraction. Complex I presents a two-dimensional 2-fold interpenetrating layer structure. Whereas complex II is a two-dimensional layer network and exhibits a typical (4,4) topological net. The infrared spectra, thermogravimetric and luminescent properties were also investigated in detail for two complexes. 相似文献
10.
Yan Ding Hongli Chen Enbo Wang Xinxin Xu Xinlong Wang Chao Qin 《Transition Metal Chemistry》2008,33(2):183-187
Two new coordination polymers [Ni(C6H10O4)(C10H8N2)]
n
(1) and [Zn3(C6H10O4)3(C12N2H8)2]
n
(2) have been synthesized under hydrothermal conditions. Complex (1) exhibits an interesting three-dimensional interpenetrating network, whereas complex (2) has a two-dimensional network. The IR and TG properties of these two complexes are studied. Furthermore, complex (2) exhibits photoluminescence.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
11.
The absorption of Fe3+ ions from Fe3+-Zn2+ mixture with zinc and calcium phosphates was studied. 相似文献
12.
Nizam M. El-Ashgar Issa M. El-Nahhal Mohamed M. Chehimi Michel Delamar Florence Babonneau Jacques Livage 《Journal of Sol-Gel Science and Technology》2007,41(1):3-10
A new insoluble solid functionalized ligand system bearing chelating ligand group of the general formula P-(CH2)3-N[CH2CONH(C6H4)NH2]2, where P represents [Si–O]
n
polysiloxane network, was prepared by the reaction of the immobilized diethyliminodiacetate polysiloxane ligand system, P-(CH2)3N(CH2CO2Et)2 with 1,2-diaminobenzene in toluene. 13C CP-MAS NMR, XPS and FTIR results showed that most ethylacetate groups (–COOEt) were converted into the amide groups (–N–C=O).
The new functionalized ligand system exhibits high capacity for extraction and removal of the metal ions (Fe3+, Co2+, Ni2+, Cu2+ and Zn2+) with efficiency of 95–97% after recovery from its primary metal complexes. This functionalized ligand system formed 1:1
metal to ligand complexes. 相似文献
13.
Treatments of nitrogen-containing heterocyclic dithioether ligands, 1,2-bis(4-(pyridin-3-yl) pyrimidin-2-ylthio) ethane (L1) and 1,3-bis (4-(pyridin-3-yl) pyrimidin-2-ylthio) propane (L2), with zinc or cadmium salts have resulted in the interesting frameworks with structural motifs from a mononuclear macrocycle or a dinuclear macrocycle to an one-dimensional structure. A small difference of the alkyl length between L1 and L2 led to conspicuous changes of the fluorescent properties of both ligands and their complexes. Mainly due to the size of metal atoms, structures of [ZnL2I2] (1) and [CdL2I2] (2) are varied from a mononuclear macrocycle to a 1D framework, while {[ZnL2(H2O)4](ClO4)2}2 (3) and {[CdL2(H2O)4](ClO4)2}2 (4) are dinuclear macrocycles in which perchlorate anions may play an important template role. As for complexes 5–8 ([ZnL1I2]n (5), [CdL1I2]n (6), {{[ZnL12(H2O)4](ClO4)2}0.5 · L10.5 · CH3OH} (7), {{[Cd0.5L1(H2O)2](ClO4)}2 · CH3OH · L1} (8)), the self-assemble processes were mainly directed by the organic ligand in the reactions of L1 with metal salts. Complexes 1–4 exhibit blue fluorescence emissions, among which 1 and 2 may be suitable as candidates for blue fluorescent materials. 相似文献
14.
《Journal of Coordination Chemistry》2012,65(11):2006-2013
Two new coordination polymers with the same topological structure [Zn(L)]2n·n(H2O) (1) and [Co(L)]2n·n(H2O) (2) (H2L = 5-(pyridin-2-ylmethoxy)-isophthalic acid) have been hydrothermally synthesized by reactions of metal salts and H2L. Single-crystal X-ray analyses reveal that 1 and 2 are isostructural and crystallize in orthorhombic chiral P21212 space group. These compounds feature 2-D undulated layer structures with (3,6)-connected kgd topology, which further extended into a 3-D supramolecular framework via intermolecular hydrogen bonds. In addition, the luminescent properties of 1 and 2 and the magnetic property of 2 were also investigated. 相似文献
15.
D. Mikolášová K. Rubešová V. Jakeš P. Nekvindová Z. Zlámalová Cílová J. Oswald 《Journal of Sol-Gel Science and Technology》2018,86(2):274-284
Compared to other oxide materials, the sol-gel deposition of an optically transparent LiNbO3 waveguiding film of sufficient thickness (approx. 1?μm) is complicated by the presence of a highly hydrolyzing Nb(V) in the starting solution. Thicker films require more concentrated solutions that are not easily achieved for such ions. This problem may be solved using strong chelating agents such as water-soluble polymers. To prepare a stable Er(III)/Yb(III)/Li(I)/Nb(V)/2-methoxyethanol solution with high metal concentration, we tested three such polymers: polyethylene glycol (PEG), polyacrylic acid (PAA) and polyvinyl alcohol (PVA), and compared them with already used polyvinylpyrrolidone (PVP). The solutions were spin-coated on crystalline sapphire substrates under a multi-step heating-deposition regime. Apart from Er3+/Yb3+ photoluminescence properties, we evaluated the influence of the film microstructure (SEM, AFM) on optical transparency and waveguiding ability in the UV/Vis/NIR region (transmission and m-line spectroscopy). Among the newly tested polymers, only PEG was able to prevent Nb(V) hydrolysis up to a maximum metal concentration of 0.6?mol/L. For PEG and PVP, the crystallization temperature of the deposited films (between 700?°C and 1000?°C) was compared. After further optimization of the heating-deposition process, we were able to prepare a transparent Er3+/Yb3+:LiNbO3 film thick enough to guide an optical signal in the NIR region. Thus, the use of PEG results is one of the very few non-hydrolytic sol-gel methods suitable for the preparation of not only luminescent, but also waveguiding Er3+/Yb3+:LiNbO3 structures. 相似文献
16.
Markus Andersson Örjan Hansson Lars Öhrström Alexander Idström Magnus Nydén 《Colloid and polymer science》2011,289(12):1361-1372
P(1-VIm-co-MMA) copolymers with 4 or 44 wt.% 1-VIm (abbreviated PVM-4 and PVM-44) where polymerized from 1-VIm (1-vinylimidazole)
and methylmethacrylate with azobisisobutyronitrile as initiator and reacted with either Cu2+ or Zn2+. The resulting coordinated polymer complexes were studied using ICP-AES, CP/MAS 13C NMR, conductivity measurements, vibrational spectroscopy (mid-FTIR and far-FTIR), DSC, and EPR. It was established by ICP-AES,
CP/MAS 13C NMR, conductivity, mid-FTIR and EPR measurements that the transition metal ions in the complexes were exclusively coordinated
by the imidazole ligand. The coordination geometry is square planar with regard to Cu(II) complexes. The strong interaction
between the polymeric imidazole ligand and the transition metal ion cross-links the system, resulting in augmentation of T
g (the glass transition temperature), especially for copolymers with high relative amount of 1-VIm. The effect of changing
metal ion is more complicated and depends on both the strength of the coordinate interaction as well as the coordination number.
The solubility of the coordinate polymer complex in conventional solvents is low due to the coordinate cross-links. However,
the coordinate polymer complexes are soluble in strongly coordinating solvents such as acetonitrile and dimethylsulfoxide. 相似文献
17.
The volta potential difference method at 298.15 K was used to determine the real primary medium effect for magnesium, calcium,
cadmium, and copper ions, and also the real Gibbs transfer energy of these ions from water into a mixed water ethanol (EtOH)
solution. The surface potential value at the nonaqueous solution/gas phase interface $
\Delta \chi _{H_2 O}^{EtOH}
$
\Delta \chi _{H_2 O}^{EtOH}
was obtained. With account for this value, chemical thermodynamic characteristics of the studied ions in the water-ethanol
solvent were calculated and the effect of composition and nature of the mixed solvent on the values obtained was analyzed.
The dependence of variation in the thermodynamic characteristics of cation resolvation was established on their crystallographic
radius that corresponds to the following sequence: Ca2+ < Cd2+ < Cu2+ < Mg2+. 相似文献
18.
A. Ortiz S. Ramos-Bernal A. Negrón-Mendoza T. Martínez G. Sanchez-Mejorada 《Journal of Radioanalytical and Nuclear Chemistry》2007,273(3):573-575
The thermoluminescense (TL) behavior of solid solutions of cadmium and manganese doped single crystals under γ-irradiation
is reported. Various compositions of single crystals of NaCl doped with Cd2+ and Mn2+ have been irradiated with ionizing radiation. The increase in the glow curve was followed as a function of the F-centers
produced by the dose. The analysis shows the potential use of these materials as dosimeters. 相似文献
19.
We have investigated the presence of foreign ions into the bulk structure and the external surfaces of aragonite using periodic
ab-initio methods. Four cations isovalent to Ca2+ were studied: Mg2+, Sr2+, Ba2+ and Zn2+. The calculations were performed at structures (bulk, surface) that contain four and eight CaCO3 units. Our results, at the Hartree-Fock level, show that the incorporation of those ions into aragonite depends strongly
on their size. Mg2+ and Zn2+, due to their smaller size, can substitute Ca2+ ions in the crystal lattice while the incorporation of Sr2+ and Ba2+ into aragonite is energetically less favoured. Examination of the [011], [110] and [001] surfaces of aragonite revealed that
the surface incorporation reduces the energetic cost for the larger ions. These systems provide challenging examples for most
shape analysis methods applied in Mathematical Chemistry. 相似文献
20.
Veronika Janíková Eugen Jóna Róbert Janík Viliam Pavlík Darina Ondrušová Michaela Ďurčeková 《Chemical Papers》2016,70(1):131-134
The influence of Ca2+-, Cu2+- and Fe3+-exchanged montmorillonite (MMT) on the type of interaction with aniline in the interlayer space of MMT has been studied by means of X-ray powder diffraction and infrared spectra. Results of X-ray diffraction showed that aniline was successfully intercalated into the interlayer space of MMT. Based on IR spectra evaluation, aniline was indirectly coordinated through a water-bridge in Ca2+- and Fe3+-MMT and it was indirectly coordinated through a water-bridge as well as protonated in Cu2+-MMT (the spectrum of protonated aniline showed deformation and changes in the NH 3 + absorption at approximately 1521 cm?1). It is important to point out that Cu2+-MMT indirect coordination and protonation occur simultaneously. 相似文献