Acetylacetone complexes of tetravalent molybdenum

Some new complexes of tetravalent molybdenum containing acetylacetone have been synthesized by the reaction of acetylacetone with hydrated molybdenum(IV) oxide. Two series of complexes having varied coordination linkages for acetylacetone have been isolated under appropriate conditions. All the compounds were characterized through their elemental analyses, spectral data, magnetic moment and conductance measurement.     

Knoevenagel Condensation of Acetylacetone with AldehydesCatalyzed by a New Catalyst Indium Trichloride

Duringthepastdecade,considerableattentionhasbeenfocusedontheorganoindiumchemistry.'AhandfulofpaPersontheaPplicationofallylindinmreagefltsandindinmpowdermediatedorganicreactionwerereported.'Mostrecelltly,indiumtfichloridehasbeenusedinorganicsynthesis.ForexamPle,InCl3-Me3SiClsystemhasbeenusedtopromotetheMukaiyamaaldolreaction,'Whiletheadditionofallylicstannanestoalde-hydespromotedbyInCl3hasalsobeenreported.'ItwasindicatedthatasanewLewisacidpromoter,InCl3mayreplacetheotherLewisacidssuchasB…     

锂、钠、镁的乙酰丙酮配合物的核磁共振碳谱理论计算

In this paper, the geometric configurations of lithium、sodium and magnesium coordination compounds with acetylacetone were optimized with density functional B3LYP method of quantum chemistry at the bigger basis sets 6-31++G(d, p), vibrational analyses were made and there were not imaginary frequencies. Their ¹³C NMR spectra were calculated at the same basis sets with GIAO method. The results of calculation are essentially consistent with experimental values.     

A New Metalloligand Powerful in Forming Helical Coordination Polymers

A new macrocyclic oxamido carboxylate metalloligand was designed and three heteronuclear coordination polymers of the metalloligand and metal nodes Cu²⁺, Zn²⁺ and Cd²⁺ were prepared. X-ray single crystal analyses (CIF files CCDC nos. 1025722–1025724 for I–III) revealed that multiple favourable features endowed the metalloligand with a strong power to force the metal nodes to generate 1D helical coordination polymers. Thermogravimetric analyses showed that the complexes with Cu²⁺ and Zn²⁺ nodes exhibited moderate thermal stability. The three complexes were also characterized by IR spectra and PXRD.     

Charge-Shift Bonding: A New and Unique Form of Bonding

Charge-shift bonds (CSBs) constitute a new class of bonds different than covalent/polar-covalent and ionic bonds. Bonding in CSBs does not arise from either the covalent or the ionic structures of the bond, but rather from the resonance interaction between the structures. This Essay describes the reasons why the CSB family was overlooked by valence-bond pioneers and then demonstrates that the unique status of CSBs is not theory-dependent. Thus, valence bond (VB), molecular orbital (MO), and energy decomposition analysis (EDA), as well as a variety of electron density theories all show the distinction of CSBs vis-à-vis covalent and ionic bonds. Furthermore, the covalent–ionic resonance energy can be quantified from experiment, and hence has the same essential status as resonance energies of organic molecules, e.g., benzene. The Essay ends by arguing that CSBs are a distinct family of bonding, with a potential to bring about a Renaissance in the mental map of the chemical bond, and to contribute to productive chemical diversity.     

A New Two-dimensional Coordination Polymer Based on Trinuclear Manganese Clusters

A novel two-dimensional Mn（II） coordination polymer, [Mn3（L）R（cis-chdc）fftrans- chdc）]n （L = 2-amino-4-（1H-imidazo[4,5-J][1,10]phenanthrolin-2-yl）phenol and chdc = 1,4-cyclo- hexanedicarboxylate）, has been hydrothermally synthesized and characterized by elemental analysis, IR, TG PL and single-crystal X-ray diffraction. Crystallographic data for this compound： monoclinic space group P2/n with a = 11.0058（13）, b = 9.0179（11）, c = 28.431（3） A, β = 92.850（2）°, V = 2818.3（6） A3, Z = 2, C62Hs6Mn3N10O14, Mr = 1329.99, Dc = 1.567 g/cm3, F（000） = 1370, p（MoKa） = 0.742 mm-1, R = 0.0553 and wR = 0.1421. The chdc carboxylates bridge the Mn（II） atoms to form a trinuclear Mn（lI） cluster. The cis-chdc ligands are held together by the trinuclear Mn（II） clusters to result in a chain structure. Further, the trans-chdc ligands link adjacent chains to furnish a two-dimensional network. The π-π interactions between neighboring layers link the adjacent layers into a three-dimensional supramolecular architecture. Moreover, the N-H...O and O-H...O hydrogen bonds further stabilize the 3D supramolecular architecture.     

On the Reaction of Malononitrile with Acetylacetone

Russian Journal of Organic Chemistry - The reaction of malononitrile with acetylacetone in alkaline medium afforded a mixture of 2-amino-4,6-dimethylbenzene-1,3-dicarbonitrile and...     

FeCl3催化乙酰丙酮的炔丙基化反应

FeCl3,催化炔丙醇与乙酰丙酮在1,2-二氯乙烷中发生亲电加成反应得炔丙基化产物--3-炔丙基-2,4-戊二酮,其结构经1H NMR,13C NMR,IR和MS表征.于90℃反应8 h,产率80.9%-94.2%.     

The Reaction of Triplet State Benzophenone with Acetylacetone

Irradiation of benzophenone in acetic acid containing acetylacetone resulted in regiospecific addition to form cis-2,2-dihpenyl-3-hydroxy-3-methyl-4-acetyloxetane and the rearrangement products therefrom. In the co-presence of copper ions, the regiospecificity is scrambled to give these products and a small amount of 1,1-diphenyl-1-buten-3-one, the secondary decomposition product of the other oxetane arising from the alternative orientation of the addition.     

乙酰丙酮热分解反应的理论研究

用MINDO/3方法研究了乙酰丙酮的热分解反应，研究结果表明，醇式构型比酮式构型稳定；具有最低能垒的两个反应通道──反应(1)和(2)的活化位垒分别为210.250和225.501 kJ·mol~(-1)．     

A New Europium Coordination Compound Supported by 4,6-Dibenzoylisophthalic Acid Ligands

A unique metal-organic framework(MOF) [Eu_2(L)_3(phen)_2]_n(1, H_2L = 4,6-dibenzoylisophthalic acid, phen = 1,10-phenanthroline) has been synthesized under hydrothermal conditions and characterized by single-crystal X-ray analysis, elemental analyses, powder X-ray diffraction, TGA measurement as well as IR spectra. The crystal is of triclinic system, space group P1, C_(90)H_(52)Eu_2N_4O_(18), M_r = 1781.32, a = 9.8697(4), b = 16.7466(6), c = 22.2556(10) ?, α = 87.113(3), β = 77.575(5), γ = 89.458(3)°, V = 3587.8(3) ?~3, Z = 2, D_c = 1.649 g/cm~3, F(000) = 1780, μ(MoKα) = 1.813 mm~(-1), Rint = 0.0181, R = 0.0260 and wR = 0.0592 for 14000 observed reflections with I 2σ(I). X-ray analysis shows that the title compound exhibits a 2D layer structure linked by L ligands with two coordination modes and two distinguished conformations, and further linked into a 3D supramolecular architecture through C–H···O weak interactions between hydrogen of phen phenyl ring and the carboxylate oxygen atom of adjacent sheets. In addition, the luminescence property of 1 was investigated.     

乙酰丙酮光度法测定香菇中甲醛

甲醛是一种原生质毒物。香菇自身产生微量甲醛，尤其是烘制过程中。近年来日本、欧盟、美国等以“绿色壁垒”限制或禁止我国香菇出口，给香菇经销者和菇农造成重大损失。已报道的甲醛测定方法主要有色谱法、吸光光度法、极谱法、动力学分析法、流动注射法等，这些方法适用于大气中、水中甲醛含量的测定。我国现有的食品卫生理化检验标准仅对食品包装材料、     

On the Coordination Properties of New Bicyclophosphite-Carbohydrates

Summary. The coordination behavior of newly developed bicyclophosphite ligands toward Mo(0), Rh(I), and Pt(II) was studied.Reactions at different ratios of metal to ligand were done. It was found that the ligands act as monodentate ones and form with hexacarbonylmolybdenum(0) complexes with the general formula Mo(CO)₅L by replacing only one carbonyl ligand. Coordination experiments toward acetylacetonatodicarbonylrhodium(I) resulted in the formation of undefined compounds. Toward dichlorocyclooctadienylplatinum(II) the monomeric phosphorus ligands act as monodentate ligands forming complexes of the general structure cis-PtCl₂L₂. All the synthesized platinum-complexes possess cis-configuration (proven by ³¹P NMR). The corresponding coordination compounds were isolated and characterized by elemental analyses and ¹H, ¹³C, and ³¹P NMR.     

乙酰丙酮分光光度法测定土壤中甲醛

建立乙酰丙酮分光光度法测定土壤中甲醛含量的分析方法。在磷酸介质中,土壤中的甲醛经过加热蒸馏提取,与乙酰丙酮反应生成黄色的二乙酰基二氢二甲基吡啶,然后于412 nm波长处测定其吸光度。甲醛含量在0.0~25μg范围内与吸光度呈良好的线性关系,线性相关系数r=0.999 6,加标回收率为76.2%~87.5%,方法检出限为0.03 mg/kg,定量限为0.12 mg/kg,测定结果的相对标准偏差为2.73%~3.68%(n=6)。该方法灵敏度高,分析速度快,适用于土壤中甲醛含量的测定。     

一种室温下制备乙酰丙酮铜络合物的方法

室温下以乙酰丙酮和自制的碱式碳酸铜为原料合成乙酰丙酮铜。最佳合成条件是碱式碳酸铜和乙酰丙酮的物质的量比为1:4,反应时间2 h,产率可达99%,该化合物经过红外光谱和元素分析等表征。该反应具有操作和后处理方便、产品纯度和产率高等优点,同时将学生实验得到的产品进行有效利用。