JCT-2000 Micro-computer-controlled Universal Fluorescent Magnetic Flaw Detector

JCT-2000 micro-computer-controlled universal fluorescent magnetic flaw detector, made by the Tianjin No.6 Machine Tool Plant, is used to detect flaws and fatigued cracks from forged products,machined products and

Synthesis and the Fluorescent, Magnetic and Thermal Stability Properties of a New Terbium（Ⅲ） Complex Tb(C20H14O3N)3(C12H8N2)（H2O）·H2O

A new terbium(Ⅲ) complex Tb(C20H14O3N)3(C12H8N2)(H2O)·H2O has been synthesized with 2-diphenylanine carbonyl benzoic acid and 1,10-phenanthroline as ligands. Crystal data for the complex are as follows: triclinic, space group P1, a =11.6034(6), b = 16.2465(8), c = 16.4427(8) A, α = 73.168(5)°, β = 88.655(4)°, γ = 82.865(4)°, V = 2943.7(3)A^3, Dc = 1.494 g/cm^3, Z = 2, μ(MoK α) = 1.272 mm^-1, F(000) = 1348, the final R = 0.0535 and wR = 0.0809. The Tb(Ⅲ) ion is coordinated by nine atoms to give a monocapped square antiprism coordination geometry. The complex shows four fluorescence emission bands arising from the transitions of Tb^3+: 5D4 → 7F6(491 nm), 5D4 → 7F5(546 nm), 5D4 → 7F4(585 nm) and 5D4→7F3(621 nm). Also reported are the magnetic and thermal stability properties of the complex.

Crystal Structure and Magnetic and Fluorescent Properties of a New Copper(Ⅱ) Complex Cu_2(L)_4(2,2'-bipy)_2(H_2O)_2

A new copper（II） complex Cu2（L）a（2,2＇-bipy）2（H2O）2 （1） has been synthesized with 2-benzoylbenzoic acid （HL） and 2,2＇-bipyridin as ligands. The crystal belongs to a monoclinic system with space group Cc, a = 13.9979（II）, b = 15.9888（13）, c = 30.306（3） A, β = 100.8700（10）°, V= 6661.1（10） A3, Dc= 1.372 g/cm3, Z = 8, F（000） = 2840, the final GOOF = 1.018, R= 0.0685, and wR= 0.1731. There are two mononuclear Cu（L）2（2,2＇-bipy）（H20） units in the crystal of 1. Each Cu（II） cation is coordinated by five atoms. The magnetic and fluorescent properties of 1 were studied. The results show that 1 exhibits weak paramagnetism, and when the excitation wavelength is at 616 nm, it has an intense fluorescent emission band around 482 nm.

Crystal Structure and Electrochemical, Fluorescent and Magnetic Properties of a New Complex [Ag(2,2ˊ-bipy)(C_(14)H_9O_3)]·(C_(14)H_(10)O_3)

A novel silver（I） complex [Ag（2,2ˊ-bipy）（C14H9O3）]·（C14H10O3） has been synthesized with 2-benzoylbenzoic acid as the ligand. Crystal data for the title complex： monoclinic, space group Cc, a = 27.4089（13）, b = 10.2897（5）, c = 12.0024（6）A, β = 111.864（4）°, Mr = 715.49, V = 3141.5（3） A3, Dc = 1.513 g/cm^3, Z = 4, μ（Mo Kα） = 0.694 mm^-1, F（000） = 1456, the final R = 0.0473 and w R = 0.1146. In the title complex, the central Ag（I） ion is located in a triangular coordination environment. The electron transfer is quasi-reversible in the electrode reaction and it shows a strong emission peak in the range of 495-520 nm under 502 nm excitation. In addition, it displays diamagnetic property from 3 to 300 K.

Synthesis and Electrochemical, Fluorescent and Magnetic Properties of a New Cadmium(II) Complex with 2-Benzoylbenzoic Acid

A new cadmium(II) complex Cd(OBBA)2(2,2A-bipy)2 with 2-benzoylbenzoic acid(HOBBA) and 2,2-bipyridine(2,2A-bipy) as ligands has been synthesized. Crystal data for the complex are as follows: monoclinic, space group P21/c with a = 16.402(3), b = 10.4191(18), c = 23.395(4) A, β = 91.765(2)o, V = 3996.2(12) A3, Dc = 1.455 gAcm-3, Z = 4, μ(Mo Kα) = 0.603 mm-1, F(000) = 1784, the final R = 0.0218 and w R = 0.0558. In the electrode reaction, its electron transfer is quasi reversible and the electrode reaction corresponds to Cd(II)/Cd(0). Under 618 nm radiation, the title complex shows a strong fluorescent band at around 326 nm. In addition, in the range of 2~300 K, this complex displays diamagnetic property.

Synthesis,Fluorescence and Magnetic Properties of a New Europium(Ⅲ)Complex Eu(C14H9O3)2(C12H8N2)2(NO3)

A new europium(III)complex Eu(CHO)(CHN)(NO)has been synthesized with 2-benzoylbenzoic acid and 1,10-phenanthroline as ligands.Crystal data for the complex are as follows:monoclinic,space group P2/c,a=9.6733(6),b=22.9521(14),c=19.7701(12)?,β=94.9800(10)o,V=4372.8(5)?~3,D=1.557 g/cm~3,Z=4,μ(Mo Kα)=1.501 mm,F(000)=2064,the final R=0.0214 and w R=0.0510.The Eu(III)ion is coordinated by ten atoms to give a bicapped square antiprism coordination geometry.The complex shows two intense fluorescence emission bands arising from the transitions of Eu:~5D→~7F(594 nm)and ~5D→~7F(618 nm).In addition,its XT decreases from 1.29767 cm~3?mol?K at 300 K to 0.01531 cm~3?mol?K at 2 K.

Synthesis,Fluorescence and Magnetic Properties of a New Europium(Ⅲ) Complex Eu(L)3(Phen)2

A new europium（III） complex Eu（L）3（Phen）2（1） with 2-benzoylbenzoic acid（HL） and 1,10-phenanthroline（Phen） as ligands has been synthesized. Crystal data for the complex are as follows： monoclinic, space group P21/c, a = 2.2577（4）, b = 1.23484（19）, c = 1.8789（3） nm, β = 94.918（3）o, V = 5.2189（14） nm^3, Dc = 1.512 g/cm^3, Z = 4, μ（Mo Kα） = 1.269 mm^-1, F（000） = 2408, the final R = 0.0433 and w R = 0.1038. The Eu（III） ion is coordinated by nine atoms to give a single-capped square antiprism coordination geometry. 1 shows two intense fluorescence emission bands arising from the transitions of Eu^3＋： ^5D0→^7F1（597 nm） and ^5D0→^7F2（615 nm） with an excitation wavelength of 396 nm. In addition, 1 displays antiferromagnetic property at low temperature.

Synthesis and Fluorescent and Magnetic Properties of a New Europium Complex Eu(C_(20)H_(14)O_(3)N)_(3)(2,2’-bipy)(H_(2)O)·H_(2)O

A new europium(Ⅲ)complex Eu(C_(20)H_(14)O_(3)N)_(3)(2,2'-bipy)(H2O)·H2O has been synthesized with2-diphenylanine carbonyl benzoic acid and 2,2'-bipyridine as ligands.Crystal data for the complex are as follows:triclinic,space group Pi,a=11.3334(5),b=16.0883(7),c=17.0116(8)A,α=70.411(4)o,β=82.435(4)o,γ=85.095(4)o,V=2894.0(2)A^(3),Dc=1.484 g/cm^(3),Z=2,μ=1.15 mm^(-1),F(000)=1320 and the final R=0.0447 and w R=0.0578.The Eu(Ⅲ)ion is coordinated by nine atoms to give a monocapped square antiprism coordination geometry.The complex shows two intense fluorescence emission bands arising from the transitions of Eu^(3+):^(5)D0→^(7)F_(1)(592 nm)and ^(5)D_(0)→^(7)F_(2)(616 nm),respectively.Also reported is the magnetic property of the complex.The complex exhibits antiferromagnetism in the temperature range of 300~2 K.

Steric hindrance effect of Schiff-base ligands on magnetic relaxation dynamics and emissive behavior of two dinuclear dysprosium complexes

The self-assembly reactions between mixed-ligand and tetrahydrate dysprosium acetate in the presence of mixed organic solvents lead to two structural similar dinuclear dysprosium complexes with composition formulas of Dy_(2)(L_1)_(2)(L_(2))_(2)(CH_(3)OH)_(2)·CH_(2)Cl_(2)·CH_(3)OH(1) and Dy_(2)(L_1)_(2)(L_(3))_(2)(CH_(3)OH)_(2)·CH_(3)CN(2),where L_1,L_(2) and L_(3) represent the deprotonated form of 4-tert-butyl-2-(7-methoxybenzo[d]oxazol-2-yl)phenol,(E)-1-(((3,5-di-tert-butyI-2-hydroxyphenyI)imino)methyl)naphthalen-2-ol and(E)-2,4-di-tertbutyl-6-((2-hydroxybenzylidene)amino)phenol.The tiny difference of the core structure of 1 and 2 is derived from the steric hindrance of Schiff base ligands L_(2) and L_(3).Dynamic magnetic measurements reveal that 1 and 2 show frequency-dependent out-of-phase alternating-current susceptibility signal peaks at different temperatures under zero dc field,diagnostic of single-molecule magnet behavior.The experimental derived energy barrier to magnetization reversal for 1 and 2 is 108(1),47(2) and 33(3) K.Ab initio CASSCF calculations performed on 1 and 2 suggest that the origin of the difference in magnetic properties originates from the variation in the single-ion anisotropy that arises due to minor structural variation.Further,the equation to calculate the effective energy barrier for Dy_(2) proposed earlier is found to yield an excellent agreement with the experimental results.Solid state fluorescence measurements performed on 1 and 2 demonstrate that both exhibit two ligands centered components of fluorescent emissive,in addition,with different emitting colors and chromaticity coordinates.The discrepancy of fluorescence and single molecule magnet behavior showed by 1 and 2 can be attributed to the steric hindrance effect of Schiff base ligands.

Polymeric dual-modal imaging nanoprobe with two-photon aggregation-induced emission for fluorescence imaging and gadolinium-chelation for magnetic resonance imaging

Nanoprobes that offer both fluorescence imaging(FI)and magnetic resonance imaging(MRI)can provide supplementary information and hold synergistic advantages.However,synthesis of such dual-modality imaging probes that simultaneously exhibit tunability of functional groups,high stability,great biocompatibility and desired dual-modality imaging results remains challenging.In this study,we used an amphiphilic block polymer from(ethylene glycol)methyl ether methacrylate(OEGMA)and N-(2-hydroxypropyl)methacrylamide(HPMA)derivatives as a carrier to conjugate a MR contrast agent,Gd-DOTA,and a two-photon fluorophore with an aggregation-induced emission(AIE)effect,TPBP,to construct a MR/two-photon fluorescence dual-modality contrast agent,Gd-DOTA-TPBP.Incorporation of gadolinium in the hydrophilic chain segment of the OEGMA-based carrier resulted in a high r_(1)value for Gd-DOTA-TPBP,revealing a great MR imaging resolution.The contrast agent specifically accumulated in the tumor region,allowing a long enhancement duration for vascular and tumor contrast-enhanced MR imaging.Meanwhile,coupling TPBP with AIE properties to the hydrophobic chain segment of the carrier not only improved its water solubility and reduced its cytotoxicity,but also significantly enhanced its imaging performance in an aqueous phase.Gd-DOTA-TPBP was also demonstrated to act as an excellent fluorescence probe for two-photon-excited bioimaging with higher resolution and greater sensitivity than MRI.Since high-resolution,complementary MRI/FI dual-modal images were acquired at both cellular and tissue levels in tumor-bearing mice after application of Gd-DOTA-TPBP,it has great potential in the early phase of disease diagnosis.

A novel synchronization approach using synthetic magnetic Escherichia coli

The group headed by Professor Chenli Liu in the Institute of Synthetic Biology,Shenzhen Institutes of Advanced Technology(SIAT)recently developed a microfluidic synchronizer to continuously produce minimally disturbed,normally growing synchronous bacterial cells(ACS Synth Biol.2019,8(5):962–967).This research highlight features the main advances made in this work and presents the findings of this study in the context of synthetic biology.

Synthesis, Structure and Properties of a New Terbium(Ⅲ) Complex Tb2(C15H11O3)6(2,2'-bipy)2

A new terbium(Ⅲ)complex Tb2(C15H11O3)6(2,2?-bipy)2 has been synthesized with 2-(4-methylbenzoyl)benzoic acid and 2,2?-bipy ligands.Crystal data for the complex:monoclinic,space group P21/n,a=14.9738(5),b=13.5469(4),c=23.0683(7)?,β=103.950(3)o,V=4541.4(3)?3,Dc=1.511 g/cm3,Z=2,μ(MoKα)=1.620 mm-1,F(000)=2088,the final R=0.0318 and wR=0.0727.The Tb(Ⅲ)ion is coordinated by eight atoms to give a distorted square antiprism coordination geometry.The complex shows three fluorescence emission bands arising from the transitions of Tb3+:5D4→7F6(490 nm),5D4→7F5(545 nm)and 5D4→7F4(584 nm).The complex exhibits antiferromagnetism in the temperature range of 300~2 K.Also reported are the thermal stability properties of the complex.

Synthesis, Structure and Properties of a New Terbium(Ⅲ) Complex Tb2(C15H11O3)6(phen)2

A new terbium(Ⅲ) complex Tb2(C15H11O3)6(phen)2 has been synthesized with 2-(4-methylbenzoyl)benzoic acid and 1,10-phenanthroline as ligands.Crystal data for the complex are as follows:monoclinic,space group P21/n,a=15.0786(6),b=13.5762(5),c=22.9683(9) A,β=104.130(4)°,V=4559.6(3) A3,Dc=1.540g/cm3,Z=2,μ(MoKα)=1.615 mm-1,F(000)=2136,the final R=0.0528 and wR=0.0740.The Tb(Ⅲ) ion is coordinated by eight atoms to give a distorted square antiprism coordination geometry.The complex shows four fluorescence emission bands arising from the transitions of Tb3+5D4→7F6(490 nm),5D4→7F5(546 nm),5D4→7F4(588 nm) and 5D4→7F3(622 nm).The complex is an antiferromagnet in the range of 300~2 K.Also reported in the paper is the thermal stability property of the title complex.

Hydrothermal Synthesis,Crystal Structure and Properties of a New Binuclear Nickel(Ⅲ) Complex with 3-(Pyridin-2-yl)-1,2,4-triazole

A new binuclear nickel(II) complex Ni_(2)(HPT)_4(H_(2)O)_(3) (1) has been hydrothermally synthesized with nickel hydroxide,3,4-pyridine dicarboxylic acid and 3-(pyridin-2-yl)-1,2,4-triazole (HPT) in the mixed solution (the volume ratio of methanol and water is 1:4).It crystallizes in tetragonal space group P4_(2)/n,with a=20.844(1),b=20.844(1),c=7.2463(7)A,V=3148.2(5)A^(3),D_(c)=1.587 g/cm^(3),Z=4,μ(Mo Ka)=1.257,F(000)=1544,the final GOOF=1.043,R=0.0437 and w R=0.1297.The crystal structure shows that the whole molecule consists of two nickel ions which are bridged by fourμ_(2)-η^(1):η^(0-3)-(pyridin-2-yl)-1,2,4-triazole anions.The coordination environment of Ni(II) ion is Ni N_(6),giving a distorted octahedral geometry.The thermal stability and fluorescent and magnetic properties of the complex were investigated.

Signal-on bimodal sensing glucose based on enzyme product-etching MnO_(2)nanosheets for detachment of MoS_(2)quantum dots

The sensitive and rapid detection of blood glucose is very important for monitoring and managing diabetes.Herein,a fluorescent/magnetic bimodal sensing strategy is proposed for glucose detection using a multifunction-responsive nanocomposite(MoS_(2)QDs-MnO_(2)NS).MoS_(2)QDs act as fluorescent probes,and MnO_(2)nanosheets are used as both quenchers and recognizers in this sensing platform.In the presence of glucose-mediated enzyme product(H_(2)O_(2)),MnO_(2)nanosheet is etched,thus releasing MoS_(2)QDs and Mn^(2+)ions,which causes the significantly enhancement of fluorescent and magnetic signals.Furthermore,MoS_(2)QDs-MnO_(2)NS-based fluorescent test paper is constructed for H_(2)O_(2)sensing with the naked eyes.Under optimal conditions,the dual linear ranges of 20-300μmol/L and 40-250μmol/L toward glucose detection are obtained for the fluorescent and magnetic mode,respectively.Furthermore,this bimodal assay exhibits good reproducibility and acceptable accuracy in glucose detection of clinical samples,demonstrating great versatility and flexibility of multifunctional probes in glucose detection.

Synthesis and Properties of Dinuclear Europium(Ⅲ)Complex Containing 2-Benzoylbenzoic Acid

A new europium(Ⅲ)complex[Eu2(C_(14)H_(9)O_(3))_(6)(2,2'-bipy)2]·(2,2'-bipy)_(2)has been synthesized with 2-benzoylbenzoic acid and 2,2'-bipyridine as ligands.Crystal data:triclinic,space group P1,with a=13.5251(5),b=13.9453(5),c=15.3582(5)Å,α=76.922(3)º,β=79.740(3)º,γ=64.248(4)º,V=2530.83(18)Å3,Dc=1.496 g/cm3,Z=1,μ(MoKα)=1.305 mm-1,F(000)=1156,the final R=0.0340 and wR=0.0638.The Eu(Ⅲ)ion is coordinated by eight atoms to give a distorted square antiprism coordination geometry.The complex exhibits antiferromagnetism in the temperature range of 300~2 K,and two intense fluorescence emission bands arising from the transitions of Eu^(3+):^(5)D_(0)→^(7)F_(1)(595 nm)and^(5)D_(0)→^(7)F_(2)(618 nm),respectively.In addition,the fluorescence sensing properties of the complex in CrO_(4)^(2-)solution were studied.