2D氢键网状Mg(Ⅱ)配合物的合成和晶体结构

The title complex [Mg(H₂O)₆]·(L)·(H₂O) [L=2-formyl-benzenesulfonate-hydrazine] was synthesized by the reaction of magnesium chloride hexahydrate with 2-formyl-benzenesulfonic acid sodium-hydrazine in the CH₃CH₂OH/H₂O. It was characterized by elemental analysis, IR and X-ray single crystal structure analysis. The crystal of the title complex [Mg(H₂O)₆]·(C₁₄H₁₂N₂O₇S₂)·(H₂O) belongs to triclinic, space group P1 with a=0.781 09(12) nm, b=0.781 27(13) nm, c=0.995 68(19) nm, α=102.054(2)°, β=92.331 0(10)°, γ=105.500(2)°, V=0.569 59(17) nm³, Z=1, D_c=1.559 Mg·m^-3, μ=0.334 mm^-1, F(000)=280, and final R₁=0.033 9, wR₂=0.091 6. The complex comprises a six-coordinated magnesium(Ⅱ) center, with a O₆ distorted octahedron coordination environment. The molecules are connected by hydrogen bonds to form two dimensional network structures. CCDC: 716601.     

2-吡嗪羧酸铜配合物的合成及其结构表征

Solvothermal reaction of 2-pyrazinic acid with Cu(SO₄)₂·5H₂O yields the title complex {[Cu₂(Pyz)₂(H₂O)₄]·SO₄}_n(1), which was characterized by elemental analysis, IR and single crystal X-ray diffraction structural analysis. The complex 1 crystallizes in Monoclinic system, space group P2₁/c, with lattice parameters a=1.126 87(6) nm, b=0.073 511(4) nm, c=1.185 06(7) nm, β=95.070(2)°, and V=0.977 83(9) nm³, Z=4, D_c=2.172 Mg·m^-3. CCDC: 692347.     

3-甲基-4-对甲基苯基-5-(2-吡啶基)-1，2，4-三唑双核锰(Ⅱ)配合物的合成及晶体结构

A dinuclear Mn(Ⅱ) complex [Mn₂L₂(μ-Cl)₂Cl₂(H₂O)₂] (1) was synthesized by reaction of ligand L with MnCl₂ ·4H₂O and its structure was determined by X-ray crystal structure analysis. The structure indicates that the complex crystallizes in monoclinic, space group C2/c with a=2.018 0(15) nm, b=0.894 0(6) nm, c=1.932 1(14) nm, β=97.506(12)°. V=3 456(4) nm3, Z=4, D_c=1.515 Mg·m^-3, μ=1.081 mm^-1, F(000)=1 608, and final R₁=0.043 8, wR₂=0.109 9. The result shows a Mn(Ⅱ) ion was six-coordinated by a bidentate 3-methyl-4-( p-methylphenyl)-5-(2-pyridyl)-1,2,4-triazole, one chlorine and one bridging chlorine atom in the basal positions and one chloride atom and one water molecule in the axial one, to form a distorted octahedral-pyramidal geometry. CCDC: 713047.     

有机-无机复合物[H2(PW12O40){Zn(C10H8N2)2(H2O)}]·1.5[Zn(C10H8N2)3]·1.75H2O的合成、结构及性能

An organic-inorganic hybrid complex, [H₂(PW₁₂O₄₀){Zn(C₁₀H₈N₂)₂(H₂O)}]·1.5[Zn(C₁₀H₈N₂)₃]·1.75H₂O has been synthesized hydrothermally and structurally characterized by X-ray crystallography. The crystal belongs to monoclinic, space grounp C2/c, with a=4.709 4(2) nm, b=1.431 77(7) nm, c=2.621 07(1) nm, β=90.125(4)°, V=17.673 4(2) nm³, Z=8, D_c=3.087 Mg·m^-3, F(000)=14 884, μ(Mo Kα)=16.327 mm^-1. The structure was refined to R₁=0.068 7 and wR₂=0.158 0 for 20 128 observed reflections with I>2σ(I). Single crystal structure shows that the title compound is constructed from [PW₁₂O₄₀]^3- cluster anion and [Zn(C₁₀H₈N₂)₂(H₂O)]²⁺ metal-organic complex cation, in which metal Zn(Ⅱ) cation are coordinately bonded to the terminal oxygen of Keggin polyanions. The title compound exhibits good catalytic activity for oxidation of benzaldehyde to benzoic acid. CCDC: 624772.     

混合价三核锰配合物Mn3O(O2CCCl3)6(py)2(H2O)的合成、晶体结构及磁性

A new mixed-valence trinuclear oxo-centered manganese complex Mn₃O(O₂CCCl₃)₆(py)₂(H₂O) was prepared by the reaction of NⁿBu₄MnO₄ with Mn(OAc)₂·4H₂O, trichloroacetic acid and pyridine in absolute EtOH. The crystal structure was determined. The complex crystallizes in monoclinic, space group P2₁/c, unit cell parame-ters, a=14.951(1), b=20.791(2), c=17.882(1)?,α=γ=90°, β=102.67(1)°. Variable temperature solid state magnetic susceptibility study shows that the complex has an antiferromagnetic exchange interaction. CCDC: 183369.     

一维链状配位聚合物[Ca(L)2·(CH3OH)2]n的合成、结构及热稳定性

The coordination polymer [Ca(L)₂·(CH₃OH)₂]_n (HL=N-phenylanthranilic acid) (1) was synthesized by the reaction of calcium perchlorate with N-phenylanthranilic acid in the CH₃OH/H₂O. It was characterized by elemental analysis, IR, thermal analysis and X-ray single crystal structure analysis. The crystal of the title complex [Ca(L)₂·(CH₃OH)₂]_n belongs to triclinic, space group P1 with a=0.751 5(3) nm, b=1.079 6(4) nm, c=1.629 5(6) nm, α=83.547(5)°, β=89.001(6)°, γ=72.257(5)°, V=1.251 0(8) nm³, Z=2, D_c=1.403 Mg·m^-3, F(000)=556, and final R₁=0.066 8, wR₂=0.140 4. The complex comprises a seven-coordinated calcium(Ⅱ) center, with a O₇ distorted pengonal bipyramidal coordination environment. Adjacent Ca(Ⅱ) ions are bridged by N-phenylanthranilicate groups, resulting in a 1D chain structure. The adjacent Ca…Ca distances are 0.382 8 nm and 0.384 6 nm. Furthermore, the molecules are connected by hydrogen bonds to form two dimensional layered structure. CCDC: 652445.     

双吡唑双齿桥联环状四核钯(II)配合物的合成和结构研究

A bipyrazolato-bridged tetra-palladium(II) cyclic complex, {[(dmbpy)Pd]₂(μ-L)}·(PF₆)₄·2(C₄H₁₀O)·(H₂O) ( μ-L=1,2-bis(3,5-dimethyl-pyrazol-4-yl)benzene), was synthesized and characterized by the ¹H NMR, element analysis, and its single crystal structure was determined by X-ray diffraction method. It crystallizes in the Tetragonal space group P4/mbm with unit cell parameters: a=2.020 0(1) nm, b=2.020 0(1) nm, c=1.281 4(1) nm, and V=5.228 5(5) nm³, Z=2, R=0.047 8, wR=0.083 9. The crystal structure revealed that two [(dmbpy)Pd]₂ moieties were bridged by two bipyrazolate ligands to form a tetra-palladium(II) cyclic complex. The Pd…Pd separation within the complex is 0.315 5(1) nm, indicat-ing weak interaction. CCDC: 645322.     

[Pb2(TNR)(NO3)2(H2O)]的制备和晶体结构研究

[Pb₂(TNR)(NO₃)₂(H₂O)] was prepared by reaction of the aqueous solution of lead nitrate and magnesium styphnate. The crystal structure of Pb₂(TNR)(NO₃)₂(H₂O)was determined by single crystal diffraction analysis. The crystal is triclinic, space group P1 with crystal parameters a=0.7279(2)nm,b=1.0698(2)nm,c=1.0738(2)nm;α=86.82(1)°,β=89.52(2)°,γ=83.50(2)°;V=0.8295(3)nm³,Z=2,D_c=3.201g·cm^-3, F(000)=716. The final R value is 0.0358.In the crystal structure, one lead ion was represented by nine coor-dination geometry; the other was showed as ten coordination geometry.     

Ag(Ⅰ)、Pd(Ⅱ)异核金属簇合物的制备和晶体结构研究

The complexes of [Ag₂Pd₂(μ-dppm)₂(μ-S₂CNC₄H₈)₂(μ₃-S₂CNC₄H₈)₂](SbF₆)₂·Et₂O (1) and [AgPd(S₂CN C₄H₈)(μ-dppm)₂](SbF₆)·H₂O (2)were synthesized and their single crystal structures were determined by X-ray diffraction. The complex 1 is monoclinic system, space group P2₁/c with a=1.14370(3)nm, b=1.39025(4)nm, c=2.93579(8)nm, β=95.173(1)°, V=4.6490(2)nm³, Z=4, D_c=1.716g·cm^-3, μ(Mo Kα)=1682cm^-1, F(000)=2384, M_r=2401.98, R=0.0662, wR=0.1302. The complex 2 is monoclinic system, space group Cc with a=2.74136(6)nm, b=1.04317(2)nm, c=2.523990(10)nm, β=95.173(1)°, V=4.6490(2)nm³, Z=4, D_c=1.716g·cm^-3, μ(Mo Kα)=1682cm^-1, F(000)=2384, M_r=2401.98, R=0.0662, wR=0.1302. CCDC: 1, 213613; 2, 213612.     

桥联双核配合物[(DPC)2Co2(H2O)5]·2H2O的合成与晶体结构

The new complex formulated [(DPC)₂Co₂(H₂O)₅]·2H₂O (HDPC^- is pyridine-2,6-dicarboxylate) has been synthesized and the crystal structure was determined by X-ray diffraction. The crystal structure of the complex belongs to monoclinic system with space group P2₁/c, a=0.83850(10) nm, b=2.7386(4) nm, c=0.9610(2) nm, β=98.280 (10) °, V=2.1838(6) nm³, Z=4, D_c=1.746 g·cm^-3, μ=1.597 mm^-1. In the crystal the two Co²⁺ are in distorted octahedrons. The part of [Co(DPC)₂] possess an approximate D_2d symmetry, while the part of [OCo₍₂₎(OH₂)₅] has an approximate C₂ symmetry.     

A carbanion induced synthesis of highly congested pyrazole and imidazole containing heterocycles

An efficient approach to the synthesis of highly congested di, penta and hexacyclic pyrazoles as well as imidazole fragment containing novel heterocyclic molecule has been developed through a carbanion induced transformation of suitably functionalized 2H-pyran-2-ones, benzo[h]chromene and thiochromeno[4,3-b]pyrans. Due to the presence of fluorescence, we report their prime application metal sensor as off/on switching in ferric ions.     

Selective synthesis of 4,5-dihydroimidazo- and imidazo[1,5-a]quinoxalines via modified Pictet–Spengler reaction

An efficient tandem approach for the selective synthesis of 4,5-dihydroimidazo[1,5-a]quinoxalines 6a–g and imidazo[1,5-a]quinoxalines 7a–h by the reaction of 2-imidazolyl anilines 4a–c with aryl aldehydes 5a–k under mild reaction conditions is described. Introduction of electron releasing alkyl groups in substrates 4a–b was found to be instrumental for the success of the reaction.     

Understanding the Diels-Alder reactivity of 1,2-azaborine analogues

The Diels-Alder reactivity of 1,2-heteroborines (H₄C₄B(H)X, X?=?NH, PH, AsH; O, S, Se) has been computationally explored by means of Density Functional Theory (DFT) calculations. The influence of the HB?=?X fragment on the reactivity of the system has been quantitatively analyzed in detail by means of the so-called Activation Strain Model (ASM) of reactivity. It is found that the interaction between these species and the dienophile is significantly stronger than that computed for their all-carbon isoelectronic counterpart, benzene. In addition, the strain energy plays a key role in the observed reactivity trends. The role of the aromaticity strength of these heteroarenes on the reactivity is also assessed.     

Synthesis of N-substituted carbazolones from α-iodo enaminones via Pd(0)-catalyzed intramolecular coupling under microwave irradiation

A variety of N-aryl and N-alkyl carbazolones were conveniently achieved in good to high yields via Pd₂(dba)₃-mediated intramolecular coupling of N-substituted α-iodo enaminones under microwave irradiation. The Pd(0)-catalyzed cyclization was found to proceed favorably with the more electron-deficient phenyl ring during the reactions involving unsymmetrical N,N-diaryl α-iodo enaminones. This unique property enables the construction of carbazolone skeleton containing nitro substituted benzenoid ring.     

Synthesis of substituted 2,4,5,6-tetrahydrocyclopenta[c]pyrazoles and 2,4,5,6-tetrahydropyrrolo[3,4-c]pyrazoles by intramolecular nitrilimine cycloaddition

Both substituted 2,4,5,6-tetrahydrocyclopenta[c]pyrazoles and 2,4,5,6-tetrahydropyrrolo[3,4-c]pyrazoles have been synthesized by the 3+2 intramolecular dipolar cycloaddition of nitrilimines to alkynes. This cyclization has been extended to more versatile 3-bromo derivatives by the use of alkynylbromides as dipolarophiles.     

Catalyst free,visible-light promoted photoaddition reactions between C60 and N-trimethylsilylmethyl-substituted tertiary amines for synthesis of aminomethyl-1,2-dihydrofullerenes

An efficient and benign method for the preparation of aminomethyl-substituted fullerenes has been developed. The process, involving catalyst free, visible-light irradiation of 10% EtOH-toluene solutions containing fullerene C₆₀ and N-trimethylsilylmethyl-substituted amines by using a 20 W compact fluorescent lamp, leads to formation of aminomethyl-substituted fullerene adducts in a highly efficient manner. The photoaddition reaction takes place via a pathway initiated by visible light absorption by C₆₀, followed by SET from the amine to the triplet excited state of C₆₀. Ethanol-promoted desilylation of the resulting a minimum radical then generates the corresponding α-amino radical which couples with the C₆₀ radical anion to form the anion precursor of the fullerene adducts. The new approach using visible-light takes place under mild conditions and it does not require the use of photocatalysts. Thus, the method developed in this effort could broadens the range of functionalized fullerene derivatives that can be readily prepared.     

Highly efficient and stereoselective cycloaddition of nitrones to indolyl- and pyrrolylacrylates

The reactions of various nitrones with indolyl- and pyrrolylacrylates proceeds regioselectively with high diastereoselectivity in the case of aldonitrones, and represents an effective method for obtaining new indolyl- and pyrrolyl-substituted isoxazolidine carboxylates stabilized by weak (CH?O) and moderate (NH?N) strength intramolecular hydrogen bonding. The resulting cycloadducts exhibit promising in vitro anti-influenza activities.     

Transition metal-free direct amination of benzoxazoles using formamides as nitrogen sources

A transition metal-free method for the direct amination of benzoxazoles using formamides as nitrogen sources is reported, which was mediated by an inexpensive and environmentally friendly tetrabutylammonium iodide/tert-butyl hydroperoxide system and gave the 2-aminobenzoxazole derivatives with moderate to good yields.     

l-Proline-catalyzed five-component domino reaction leading to multifunctionalized 1,2,3,4-tetrahydropyridines

Multifunctionalized 1,2,3,4-tetrahydropyridines are concisely synthesized in good yields via l-proline-catalyzed or l-proline/FeCl₃-cocatalyzed one-pot multicomponent reactions (MCRs). The MCRs involve a domino hydroamination/prins reaction/Mannich-type reaction/intramolecular dehydration-cyclization process. The molecular structure of 5baa, one of multifunctionalized 1,2,3,4-tetrahydropyridines, was confirmed by single-crystal X-ray diffraction.     

Exploring the scope of the Gewald reaction: Expansion to a four-component process

An efficient four-component reaction was developed to take advantage of the reactivity of the 2-aminothiophene-3-carbonitrile functionality, which is obtained during the classical three-component Gewald reaction. Various α-methylene bearing ketones were reacted with malononitrile, elemental sulfur, and aryl/heteroarylnitrile derivatives in t-BuOH/NaOH to afford 2-arylthieno[2,3-d]pyrimidin-4-amines in high yields. Preliminary studies revealed the photophysical properties of the products and their potential for use as metal sensors.