铜(Ⅱ)配合物[Cu_3(μ-OH)(μ-pz)_3(Hpz)(μ-Ac)_2]_n的合成与晶体结构

吡唑与醋酸铜在p H 9的水溶液中,室温下通过自组装合成标题配合物。用元素分析和X-射线单晶衍射分析配合物的结构,结果显示,晶体属于单斜晶系,空间群为P2(1)/c,晶体单胞参数为a=11.648(2),b=19.869(3),c=9.703 5(16),β=99.535(2)°。配合物3个中心铜(Ⅱ)离子均采取四面体构型,氢氧根与3个铜离子均形成配位键,由于配体桥连使配合物形成螺旋链,螺旋链之间通过醋酸根连接。     

吡唑类化合物的应用研究进展

吡唑类化合物在生物医药、农药、染料等领域有着重要的作用。本文综述了吡唑类化合物的最新应用研究进展。     

Highly Efficient Near‐Infrared Electroluminescence up to 800 nm Using Platinum(II) Phosphors

Near‐infrared organic light‐emitting diodes (NIR OLEDs) enable many unique applications ranging from night‐vision displays and photodynamic therapies. However, the development of efficient NIR OLEDs with a low efficiency roll‐off is still challenging. Here, a series of new heteroleptic Pt(II) complexes ( 1 – 4 ) flanked by both pyridyl pyrimidinate and functional azolate chelates are synthesized. The reduced ππ* energy gap of the pyridyl pyrimidinate chelate, and strong intermolecular interaction and high crystallinity in vacuum‐deposited thin films engender strong intermolecular charge transfer transition including metal–metal‐to‐ligand charge transfer; thereby, exhibiting efficient photoluminescence within 776–832 nm and short radiative lifetimes of 0.52–0.79 µs. Consequently, nondoped NIR‐emitting OLEDs based on these Pt(II) complexes are fabricated, to which Pt(II) complexes 2 and 4 give record high maximum external quantum efficiency of 10.61% at 794 nm and 9.58% at 803 nm, respectively. Moreover, low efficiency roll‐off is also observed, among which the device efficiencies of 2 and 4 are at least four times higher than that of the best NIR‐emitting OLEDs recorded at current density of 100 mA cm^?2.     

五种杀虫剂对小菜蛾的室内生物活性研究

小菜蛾Plutella xylostella是十字花科蔬菜的主要害虫，其造成的为害给蔬菜生产带来巨大损失。本文采用触杀毒力法和摄食毒力法测定了5种新颖的杀虫剂对小菜蛾的室内生物活性，研究结果表明：采用浸渍法处理72h，10％溴虫腈乳油和5．44%丁烯氟虫腈乳油对小菜蛾的触杀活性较好，其LC50值分别为1．758mg／L和2．289mg／L；采用药膜法处理72h，5．44％丁烯氟虫腈乳油和5％锐劲特悬浮剂对小菜蛾表现出了优越的胃毒作用活性，其LC50值分别为0．165mg／L和0．259mg／L。     

四嗪吡唑类新化合物的合成及其杀螨活性

以氟螨嗪为先导化合物,设计、合成了4个四嗪吡唑类新化合物,通过1~H NMR、元素分析确证了结构。对螨卵的活性测定结果显示,在10 mg/L质量浓度下,新化合物9a、9b对朱砂叶螨螨卵活性分别为86%、83%,远高于对照药剂氟螨嗪。     

Bis‐Tridentate Ir(III) Metal Phosphors for Efficient Deep‐Blue Organic Light‐Emitting Diodes

Emissive Ir(III) metal complexes possessing two tridentate chelates (bis‐tridentate) are known to be more robust compared to those with three bidentate chelates (tris‐bidentate). Here, the deep‐blue‐emitting, bis‐tridentate Ir(III) metal phosphors bearing both the dicarbene pincer ancillary such as 2,6‐diimidazolylidene benzene and the 6‐pyrazolyl‐2‐phenoxylpyridine chromophoric chelate are synthesized. A deep‐blue organic light‐emitting diode from one phosphor exhibits Commission Internationale de l'Eclairage (CIE_{(x ,y )}) coordinates of (0.15, 0.17) with maximum external quantum efficiency (max. EQE) of 20.7% and EQE = 14.6% at the practical brightness of 100 cd m^?2.     

Pyrazolyl-diamine ligands that bear anthracenyl moieties and their rhenium(I) tricarbonyl complexes: synthesis, characterisation and DNA-binding properties

Two novel families of pyrazolyl-diamine ligands that bear an anthracen-9-yl group as a DNA-binding fragment, pz*(CH2)2NH(CH2)2NHCH2-9-anthryl (pz*=pz (L(1)), 3,5-Me2pz (L2)) and pz*(CH2)2NH(CH2)2NH(2 (pz*=4-(9-anthrylmethyl)pz (L3), 3,5-Me2-4-(9-anthrylmethyl)pz (L4)), have been prepared and fully characterised. In the case of L2-L4, the evaluation of their coordination capability towards the fac-[Re(CO)3]+ core led to the synthesis of the organometallic complexes fac-[Re(CO)(3){3,5-Me(2)pz(CH2)2NH(CH2)2NHCH2-9-anthryl}]Br (7) and fac-[Re(CO)3{4-(9-anthrylmethyl)pz*(CH2)2NH(CH2)2NH2}]Br (pz*=pz (8), 3,5-Me2pz 9). The interaction of the novel pyrazole-diamine ligands and the rhenium(I) complexes with calf thymus (CT) DNA has been investigated with a variety of spectroscopic techniques (UV-visible, fluorescence, circular dichroism (CD) and linear dichroism (LD)). All of the evaluated compounds have a moderate affinity to CT DNA (3.46x10(3)相似文献   

具有杀虫杀螨活性的吡唑类化合物的研究进展

吡唑类衍生物是一类具有良好生物活性的化合物。概述了近十几年来文献报道最多的几类吡唑类衍生物的杀虫杀螨活性以及它们的结构特点。研究表明,此类化合物具有广泛生物活性,开发吡唑类杀虫、杀螨剂具有良好的发展前景。     

具有除草活性的吡唑类化合物的研究进展

吡唑类衍生物是一类具有良好除草活性的化合物。概述了近十年文献报道最多的几类吡唑类除草剂的除草活性以及它们的结构特点。研究表明,吡唑类化合物具有广泛的生物活性,作为除草剂研究开发很有发展前景。     

4‐Halogeno‐3,5‐dimethyl‐1H‐pyrazole‐1‐carbodithioates: versatile reversible addition fragmentation chain transfer agents with broad applicability

Pyrazole‐based dithiocarbamates are versatile reversible addition fragmentation chain transfer (RAFT) agents that provide molar mass and dispersity (? ) control over the radical polymerization of both more and less activated monomers (MAMs and LAMs). In this paper we report on theoretical and experimental findings demonstrating that their activity as RAFT agents can be significantly enhanced by introducing electron‐withdrawing substituents to the pyrazole ring. This enhancement is most noticeable in methyl methacrylate polymerization where product molar masses are more accurately predicted by the RAFT agent concentration, and significantly lower ? values, with respect to those seen with the parent RAFT agent under similar conditions, are observed. Thus, use of 4‐chloro‐3,5‐dimethyl‐1H ‐pyrazole‐1‐carbodithioate provides a poly(methyl methacrylate) with the anticipated molar mass and ? as low as 1.3 at high monomer conversion. Good control is retained for monosubstituted MAMs, styrene, methyl acrylate and N ,N ‐dimethylacrylamide. Low dispersities and less molar mass control are also achieved for homo‐ and copolymerizations with the LAM vinyl acetate, albeit with some retardation. © 2017 The Authors. Polymer International published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.