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1.
Clovis Piovezan Fábio da Silva Lisboa Fábio Souza Nunes Sueli Maria Drechsel 《Transition Metal Chemistry》2011,36(1):79-85
We report the reactivity of three binuclear non-heme Fe(III) compounds, namely [Fe2(bbppnol)(μ-AcO)(H2O)2](ClO4)2 (1), [Fe2(bbppnol)(μ-AcO)2](PF6) (2), and [Fe2(bbppnol)(μ-OH)(Cl)2]·6H2O (3), where H3bbppnol = N,N′-bis(2-hydroxybenzyl)-N,N′-bis(2-methylpyridyl)–1,3-propanediamine-2-ol, toward the hydrolysis of bis-(2,4-dinitrophenyl)phosphate as models for phosphoesterase
activity. The synthesis and characterization of the new complexes 1 and 3 was also described. The reactivity differences observed for these complexes show that the accessibility of the substrate
to the reaction site is one of the key steps that determinate the hydrolysis efficiency. 相似文献
2.
Two hexa-coordinate copper(II) complexes formulated as [Cu(phen)(4-dmampy)2(ClO4)2] and [Cu(bpy)(3-ampy)2(ClO4)2] · 0.5CH3OH · 0.5H2O (phen = 1,10–phenanthroline bpy = 2,2′-bipyridine, 3-ampy = 3-aminopyridine, 4-dmampy = 4-dimethylaminopyridine), and one
low-spin ferrous complex formulated as [Fe(dmbpy)3](ClO4)2 · H2O (dmbpy = 4,4′-dimethyl-2,2′-bipyridine), were synthesized by in situ ligand substitution at room temperature, and characterized by X-ray single-crystal diffraction. This is the first structural
report where either 4-dmampy and phen molecules, or 3-ampy and bpy molecules, are located simultaneously around one metal
center. 相似文献
3.
Magnetic susceptibility investigations have been carried out on a family of the tetra-transition-metal sandwiched Weakley-type
germanotungstates Na11H[Co4(H2O)2(α-GeW9O34)2]·31H2O (1), (C6N2H18)4[Co(H2O)6]H2[Co4(H2O)2(α-GeW9O34)2]·5.5H2O (2) and Na(H2O)2(C6N2H18)4.75H1.5[Ni4(H2O)2(α-GeW9O34)2]·1.5H2O (3) with the intention of studying the magnetic exchange properties of the rhomb-like four transition-metal ions in the central
belt. The Co–Co and Ni–Ni ferromagnetic exchange interactions are dominant in the rhomb-like M4O16 units in 1–3. Furthermore, magnetic susceptibility measurements also reveal that the magnetic coupling constant J is a sensitive parameter that is closely realted to the M–O–M angles and M···M separations in the rhomb-like magnetic core.
Variable-temperature ac susceptibilities exhibit that magnetic properties of 2 and 3 are related to the spin glassy behaviors. 相似文献
4.
The reaction of ZnSiF6·6H2O with 4,4′-dipyridyldisulfide (4-PDS) in CH3OH afforded the complex [Zn(4-PDS)2(SiF6)·3CH3OH]
n
, 1, while the reaction of Zn(ClO4)2·6H2O with l,2-bis(4-pyridyl)ethane (bpa) in CH3OH gave the complex [Zn(bpa)2(ClO4)2·CH3OH]
n
, 2. The 4-DPS ligand in 1 is coordinated to the metal centers through both nitrogen atoms to form a 3-D open channel and the distorted octahedral coordination geometry at each zinc center is completed by a pair of trans-F-bonded hexafluorosilicate molecule. Compound 2, the channel-type 1-D chains are interlinked through C–H···O interaction to form 3-D structure with large cavities that are occupied by the methanol molecules. 相似文献
5.
Abstract
Based on the polydentate ligand 3,5-bis(3-pyridyl)-1H-1,2,4-triazole (3,3′-Hbpt), three coordination compounds [Zn(3,3′-Hbpt)(ip)]·2H2O (1), [Zn(3,3′-Hbpt)(5-NO2-ip)]·H2O (2), and [Zn(3,3′-Hbpt)2(H2pm)(H2O)2]·2H2O (3) have been hydrothermally constructed with H2ip, 5-NO2-H2ip and H4pm as auxiliary ligands (H2ip = isophthalic acid, 5-NO2-H2ip = 5-NO2-isophthalic acid, H4pm = pyromellitic acid). Structural analysis reveals that Zn(II) ions serve as four-coordinated, five-coordinated, and six-coordinated connectors in 1–3, respectively, while 3,3′-Hbpt adopts μ-Npy and Npy coordination modes in two typical conformations in these target coordination compounds. Dependently the applied ligand, compounds 1–3 exhibit either 1D channel, cage or chain structures, respectively. In addition, the luminescence properties of 1–3 have been investigated in the solid state at room temperature. 相似文献6.
Lead(II) coordination polymer [Pb(5,5′-dmbpy)(μ-NO3)2]
n
(1) and mononuclear complex [Pb(6,6′-dmbpy)(NO3)2] (2) (where 5,5′-dmbpy is 5,5′-dimethyl-2,2′-bipyridine and 6,6′-dmbpy is 6,6′-dimethyl-2,2′-bipyridine) were synthesized from
reaction of lead(II) nitrate with 5,5′-dmbpy and 6,6′-dmbpy, respectively. Both complexes were thoroughly characterized by
elemental analysis, infrared, 1H and 13C NMR, UV–Vis, emission spectroscopy, as well as single-crystal X-ray diffraction. Polymer 1 possesses one-dimensional (1D) chain structure, whilst complex 2 exhibits a discrete complex which provide an extended chain parallel to the [001] direction, via weak intermolecular C–H···O
hydrogen bonding. Coordination number of Pb2+ in 1 and 2 are 8 and 6, respectively, with the stereochemically active lone pair, resulting in the hemidirected geometry for both complexes.
The nitrate anions exhibit a tridentate chelating/bridging mode in 1, and a bi-chelating mode in 2. The supramolecular features in these complexes are guided/influenced by weak directional intermolecular C–H···O hydrogen
bonding (1 and 2) together with π–π and C–H···π (1) interactions. The luminescence studies of 1 and 2 confirmed that the position of methyl substituent on 2,2′-bipyridine rings has a profound effect on the fluorescence emissions. 相似文献
7.
《Journal of Coordination Chemistry》2012,65(16):1825-1834
Treatment of freshly precipitated Cu(OH)2?·?xH2O and 2,4,6-tris(2-pyridyl)-1,3,5-triazine (tptz) with oxalic and malonic acids in methanol-water at room temperature gave [Cu(tptz)(C2O4)(H2O)]?·?4H2O (1) and [Cu(pma)(C3H2O4)(H2O)]?·?H2O (2) (pma?=?2-aminocarbonylpyridine), respectively. Reaction in the absence of any acid resulted in [Cu(bpca)(tca)]?·?2H2O (3) (bpca?=?bis(2-pyridylcarbonyl)amide anion; tca?=?2-pyridinecarboxylate anion). Complex 1 consists of [Cu(tptz)(C2O4)(H2O)] and lattice H2O molecules; the tridentate tptz ligand, bidentate oxalate dianion and an aqua ligand are bound to Cu with distorted octahedral geometry. Complex 2 is composed of [Cu(pma)(C3H2O4)(H2O)] and lattice H2O molecules; the bidentate 2-aminocarbonylpyridine ligand, a bidentate malonate dianion and an aqua ligand are coordinated to Cu with a slightly distorted square pyramidal geometry. Complex 3 consists of [Cu(bpca)(tca)] and lattice H2O molecules. Square pyramidally coordinated Cu atoms are surrounded by tridentate bpca with nitrogen donor atoms and a bidentate 2-pyridinecarboxylate anion. 相似文献
8.
Abstract
Four complexes of 3,3-diphenylpropanoate (L) and 4,4′-bipyridine as auxiliary bridging ligands were synthesized and characterized, namely [Zn(L)2(4bpy)(EtOH)2]∞ (1), [Co(L)2(4bpy)(EtOH)2]∞ (2), [Ni(L)2(4bpy)(EtOH)2]∞ (3), and [Cu(L)2(4bpy)(H2O)]∞ (4) (4bpy = 4,4′-bipyridine). X-ray single-crystal diffraction analyses show that complexes 1–4 all take one-dimensional (1D) fishbone-like structures incorporating bridging 4bpy ligands. The complexes show different supramolecular frameworks interlinked via intermolecular hydrogen bonds, π···π stacking, and/or C–H···π supramolecular interactions. Complex 3 only has a simple one-dimensional fishbone-like chain, whereas complexes 1 and 2 show two-dimensional supramolecular structures by interchain C–H···O hydrogen bonds. Complex 4 is assembled into two-dimensional layers and then an overall three-dimensional framework by a combination of interchain O–H···O hydrogen bonds and C–H···π supramolecular interactions. The luminescent properties of the ligands and their complexes were investigated. 相似文献9.
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
10.
The complexes of 4-chloro-2-methoxybenzoic acid anion with Mn2+,
Co2+, Ni2+, Cu2+
and Zn2+ were obtained as polycrystalline solids
with general formula M(C8H6ClO3)2·nH2O and colours typical for M(II) ions (Mn – slightly pink, Co –
pink, Ni – slightly green, Cu – turquoise and Zn – white).
The results of elemental, thermal and spectral analyses suggest that compounds
of Mn(II), Cu(II) and Zn(II) are tetrahydrates whereas those of Co(II) and
Ni(II) are pentahydrates. The carboxylate groups in these complexes are monodentate.
The hydrates of 4-chloro-2-methoxybenzoates of Mn(II), Co(II), Ni(II), Cu(II)
and Zn(II) heated in air to 1273 K are dehydrated in one step in the range
of 323–411 K and form anhydrous salts which next in the range of 433–1212
K are decomposed to the following oxides: Mn3O4,
CoO, NiO and ZnO. The final products of decomposition of Cu(II) complex are
CuO and Cu. The solubility value in water at 293 K for all complexes is in
the order of 10–3 mol dm–3.
The plots of χM
vs.
temperature of 4-chloro-2-methoxybenzoates of Mn(II), Co(II), Ni(II) and Cu(II)
follow the Curie–Weiss law. The magnetic moment values of Mn2+,
Co2+, Ni2+ and Cu2+
ions in these complexes were determined in the range of 76−303 K and
they change from: 5.88–6.04 μB for Mn(C8H6ClO3)2·4H2O, 3.96–4.75
μB for Co(C8H6ClO3)2·5H2O, 2.32–3.02 μB for Ni(C8H6ClO3)2·5H2O and 1.77–1.94
μB for Cu(C8H6ClO3)2·4H2O. 相似文献
11.
Fa-Nian Shi Mário S. Reis Paula Brandão A. M. Souza Vitor Félix João Rocha 《Transition Metal Chemistry》2010,35(7):779-786
Two new Mn(II) coordination polymers formed with molecular formula [Mn(H2O)2(HBTC)·(H2O)] 1 and [Mn(H2O)2(4,4′bipy)(HBTC)2]·(H4,4′bipy)2
2, where BTC = 1,2,4-benzenetricarboxylate and 4,4′bipy = 4,4′bipydine, have been synthesized via hydrothermal approach and
characterized by single crystal X-ray diffraction techniques. 1 is composed of Mn–H2O–Mn 1D chains and further the chains are linked by HBTC ligands to form a 2D network in the ab plane; 2 is constructed by Mn–4,4′bipy–Mn 1D chains along the b direction with Mn2+ ions coordinated to H2BTC and water as terminal ligands to form a 2D network. We also prepared a third compound with the molecular formula of [Mn(H2O)(HBTC)·(H2O)] which has been recently structurally reported elsewhere. The magnetic properties of the three compounds have been studied
in detail under variable temperatures. 相似文献
12.
Svetlana G. Baca Stefanie Breukers Arkady Ellern Paul Kgerler 《Acta Crystallographica. Section C, Structural Chemistry》2011,67(12):m371-m374
The reaction of the μ3‐oxido‐centred trinuclear isobutyrate cluster [Fe3O(O2CCHMe2)6(H2O)3]+ with an excess of phenol (PhOH) in chloroform produces a novel octanuclear FeIII cluster, cyclo‐tetra‐μ2‐hydroxido‐dodeca‐μ2‐isobutyrato‐κ24O:O′‐octa‐μ2‐phenolato‐κ16O:O′‐octairon(III) phenol hexasolvate monohydrate, [Fe8(C4H7O2)12(C6H5O)8(OH)4]·6C6H5OH·H2O. The neutral cluster is located about a centre of inversion and consists of a planar ring of eight FeIII centres with two types of bridges between adjacent Fe atoms: each Fe atom is bridged to one of its neighbours by a μ‐hydroxide and two 1,3‐bridging carboxylates, or by two phenolate and one 1,3‐bridging isobutyrate ligand. The cavity within the {Fe8} wheel is occupied by a disordered water molecule. Intermolecular O—H...O hydrogen bonds and C—H...π interactions connect the clusters and the phenol solvent molecules to form a three‐dimensional network. 相似文献
13.
K. V. Yusenko D. B. Vasilchenko A. V. Zadesenets I. A. Baidina Yu. V. Shubin S. V. Korenev 《Russian Journal of Inorganic Chemistry》2007,52(10):1487-1491
Double complexes [Pt(NH3)5Cl][Fe(C2O4)3] · 4H2O, [Pt(NH3)5Cl][Co(C2O4)3] · 2H2O, and [Pt(NH3)5Cl][Cr(C2O4)3] · 4H2O were synthesized and studied by single-crystal X-ray diffraction, X-ray phase analysis, differential thermal analysis, elemental
analysis, and IR spectroscopy. The crystal structures of the compounds were examined from the viewpoint of the close packing
of coordination polyhedra. The thermal properties of the synthesized complexes and K3[M(C2O4)3] salts (M = Fe, Co, Cr) were compared. A procedure for the synthesis of the FePt, CoPt, and CrPt intermetallic compounds
through the thermolysis of the obtained complexes was developed.
Original Russian Text ? K.V. Yusenko, D.B. Vasil’chenko, A.V. Zadesenets, I.A. Baidina, Yu.V. Shubin, S.V. Korenev, 2007,
published in Zhurnal Neorganicheskoi Khimii, 2007, Vol. 52, No. 10, pp. 1589–1593. 相似文献
14.
Ming-Li Liu Jian-Min Dou Da-Cheng Li Da-Qi Wang Jian-Zhong Cui 《Transition Metal Chemistry》2012,37(1):117-124
The thiosemicarbazide and hydrazide Cu(II) complexes, [Cu3L21(py)4Cl2] (1), [Cu(HL2)py] (2) and [Cu(HL3)py] (3), (H2L1 = 1-picolinoylthiosemicarbazide, H3L2 = N′-(2-hydroxybenzylidene)-3-hydroxy-2-naphthohydrazide, H3L3 = 2-hydroxy-N′-((2-hydroxy-naphthalen-1-yl)methylene)benzohydrazide) have been prepared and characterized through physicochemical and spectroscopic
methods as well as X-ray crystallography. Complex 1 has a centrosymmetric structure with –N–N– bridged Cu3 skeleton. Neighboring molecules are linked into a 3D supermolecular framework by π–π stacking interactions, N–H···Cl and
C–H···Cl hydrogen bonds. Complexes 2 and 3 have similar planar structures but different dimers formed by concomitant Cu···N and Cu···O interactions, respectively. Solvent
accessible voids with a volume of 391 ?3 are included in the structure of complex 2, indicating that this complex is a potential host candidate. Thermogravimetric analysis shows that the three complexes are
stable up to 100 °C. 相似文献
15.
《Journal of Coordination Chemistry》2012,65(4):211-214
Abstract Binuclear iron(III) complexes with salicylate ligands, Na2 [Fe2 (C7 H4 O3)4 (H2O)2] and Na4 [Fe2 (C7H4O3)4 (OH)2], crystallize out in the pH range 1–5 and pH 5.5, respectively, from solutions containing iron(III) chloride and a slightly more than two molar proportion of sodium salicylate. Infrared and Mössbauer spectral results and magnetic moment data indicate the presence of non-linear Fe—O—Fe bridge bonds. Evidently two salicylate ligands form bridges between the two iron(III) ions through phenolic oxygen. Mössbauer spectral results indicate the absence of bridging salicylate ligands in solutions of the complex prepared by mixing iron(III) chloride and two to three-fold molar excess of salicylate ions; only mononuclear complexes exist in such solutions. 相似文献
16.
Yan Ding Hongli Chen Weilin Chen Enbo Wang Jingxin Meng 《Transition Metal Chemistry》2009,34(3):281-288
Four novel organic–inorganic hybrid compounds [Cu5
I(4,4′-bpy)3(2,2′-bpy)4][BW12O40] · H2O (1), [Ni0.5(2,2′-bpy)1.25][Ni(2,2′-bpy)3][Ni(2,2′-bpy)2(H2O)(SiW11VIWVO40)] · 0.5H2O (2), [H2bpy]2[Zn(2,2′-bpy)3]2[Si2W18O62] · 1.5H2O (3) and [CuII(2,2′-bpy)2]2[SiW12O40] · 2H2O (4) (2,2′-bpy = 2,2′-bipyridine, 4,4′-bpy = 4,4′-bipyridine) have been synthesized under hydrothermal conditions and characterized
by elemental analysis, IR spectroscopy, thermal gravimetric analysis, electrochemical measurements and single-crystal X-ray
diffraction. Compound (1) is a novel [BW12O40]5− polyoxoanion bisupported by copper(I) coordination cations with mixed 2,2′-bpy and 4,4′-bpy ligands. Compound (2) is constructed from the [SiW11VIWVO40]5− polyoxoanions supported by [Ni(2,2′–bpy)2]2+. Compound (3) is composed of a novel [Si2W18O62]8− cluster and [Zn(2,2′–bpy)3]2+ complexes, which held together into a three-dimensional (3D) supramolecular network through hydrogen-bonding interactions.
Compound (4) shows a 2D layer framework constructed from a bisupporting Keggin polyoxoanion cluster and [Cu(2,2′–bpy)2]2+ coordination polymer fragments, resulting in 3D networks via supramolecular interactions.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
17.
Baoming Ji Dongsheng Deng Zhiqiang Wang Xianming Liu Shaobin Miao 《Structural chemistry》2008,19(4):619-623
Two supramolecular complexes Ni[(Py)2C(OH)2]2·(CH3COO)2·4H2O 1 and Co[(Py)2C(OH)2]2·(CH3COO)2·2H2O 2 have been synthesized under hydrothermal conditions and structurally characterized by elemental analysis, IR spectra, and
X-ray single-crystal diffraction. The X-ray diffraction analysis indicates that the center metal (Ni2+ and Co2+) ions having the same coordination environments are chelated by two pyridyl N atoms and a hydroxyl O atom of the gem-diol ligand in an octahedral geometry. In 1, the lattice water molecules form infinite single helical chains, while in 2, two lattice water molecules are discrete. In their crystal structures, intermolecular O–H···O and C–H···O hydrogen bonds
form an extensive three-dimensional network, which consolidates the crystal packing. 相似文献
18.
Wiesława Ferenc Beata Cristóvão Jan Sarzyński 《Journal of Thermal Analysis and Calorimetry》2010,101(2):761-767
5-Chloro-2-nitrobenzoates of Co(II), Ni(II) and Cu(II) having formulae Co(C7H3O4NCl)2·3H2O, Ni(C7H3O4NCl)2·3H2O and Cu(C7H3O4NCl)2·2H2O, were obtained as polycrystalline compounds. From the IR spectra analysis of complexes, sodium salt and according to the
spectroscopic criteria the carboxylate ions seem bidentate groups. The complexes of Co(II) and Cu(II) lose the water of crystallization
in one step at 363–523 K. The Ni(II) complex loses it in two stages in the ranges of 323–378 and 378–523 K, respectively.
The compounds follow the Curie–Weiss law. The magnetic moment values experimentally determined change from 4.53 to 4.55 μB for Co(II) complex, from 2.34 to 2.97 μB for Ni(II) 5-chloro-2-nitrobenzoate and from 1.80 to 1.90 μB for Cu(II) complex. 相似文献
19.
Two new complexes with formula VOL2·nH2O ((1) L: 4′,5,7-trihydroxyflavone-7-rhamnoglucoside (naringin), n = 8; (2) L: 3′,4′,7-tris[O-(2-hydroxyethyl)]rutin (troxerutin), n = 0) were synthesised and characterised. The IR and UV–Vis spectral data indicate that these flavones act as bidentate chelating
ligands and generate VO(II) complexes with a square-pyramidal stereochemistry. The thermal analysis (TG, DTA) elucidated the
composition and also the number and nature of the water molecules. The thermal behavior indicates also a strong interaction
between oxovanadium (IV) and these oxygen donor ligands. 相似文献
20.
《Journal of Coordination Chemistry》2012,65(21):3772-3782
The trianionic heptadentate ligand, (Z)-3-(5′-bromosalicylhydrazinocarbonyl) propenoic acid ((Z)-H4bshcpa), has been synthesized in good yield and reacted with FeCl3?·?6H2O to produce [FeIII 6(C12H8N2O5Br)6(H2O)2(CH3OH)4]?·?8H2O?·?8CH3OH. The complex has been characterized by single-crystal X-ray diffraction. In the self-assembly process the ligand was esterified and transferred into (Z)-methyl 3-(5′-bromosalicylhydrazinocarbonyl) propenoate ((Z)-H3mbshcp). In the crystal structure, the neutral Fe(III) complex contains an 18-membered metallacrown ring consisting of six Fe(III) and six trianionic ligands. The 18-membered metallacrown ring is formed by six structural moieties of the type [Fe(III)–N–N]. Due to the meridional coordination of the ligands to Fe3+, the ligands enforce stereochemistry of the Fe3+ ions as a propeller configuration with alternating Λ/Δ forms. The metallacrown can be treated with SnCl2 to obtain purified ester. In addition, we have also obtained reduced esterified ligand, methyl 3-(5′-bromosalicylhydrazinocarbonyl) propanoate (H3mbshcp), with Zn powder as reductant. 相似文献