Scanning optical reconstruction of coded aperture images

A scanning optical technique is described and used to reconstruct coded aperture images obtained with four different kinds of arrays. The feasibility and advantages of the technique are demonstrated experimentally. The results are used to compare the imaging properties of these arrays, i.e.: lateral resolution, background noise and axial (tomographic) resolution.     

Indium‐promoted Conversion of Allylic Bromide to Alcohol Moiety and Synthesis of Pipermethystine Skeletons

Dihydropyridone bromide ( 2 ) was converted to the corresponding alcohol ( 1 ) by reaction with indium in air or with indium followed by treatment with a sulfonyloxaziridine. The alcohol ( 1 ) was transformed in four steps to a phenylsulfone‐substituted pipermethystine derivative ( 10 ). Reductive cleavage of the phenylsulfone did not yield the pipermethystine natural product. Several new pyridone derivatives were synthesized.     

Highly Efficient Multiphoton‐Pumped Frequency‐Upconversion Stimulated Blue Emission with Ultralow Threshold from Highly Extended Ladder‐Type Oligo(p‐phenylene)s

A series of highly extended π‐conjugated ladder‐type oligo(p‐phenylene)s containing up to 10 phenyl rings with (L)‐Ph(n)‐NPh (n=7–10) or without diphenylamino endcaps (L)‐Ph(n) (n=7 and 8) were synthesized and investigated for their multiphoton absorption properties for frequency upconverted blue ASE/lasing. Extremely large two‐photon absorption (2PA) cross‐sections and highly efficient 2PA ASE/lasing with ultralow threshold were achieved. (L)‐Ph(10)‐NPh exhibits the highest intrinsic 2PA cross‐section of 3643 GM for a blue emissive organic fluorophore reported so far. The record‐high 2PA pumped ASE/lasing efficiency of 2.06 % was obtained by un‐endcapped oligomer, (L)‐Ph(8) rather than that with larger σ₂, suggesting that a molecule with larger σ₂ is not guaranteed to exhibit higher η₂. All of these oligomers exhibit exceptionally ultralow 2PA pumped ASE/lasing thresholds, among which the lowest 2PA pumped threshold of circa 0.26 μJ was achieved by (L)‐Ph(10)‐NPh.     

Phenyl-calix[4]arene-based fluorescent sensors: cooperative binding for carboxylates

Tetrakis-(4-carbamoylphenyl)-substituted and tetrakis-(4-amidophenyl)-substituted calix[4]arenes as well as the monomeric biphenylcarbamate have been synthesized as fluorescent receptors for anion sensing. Their binding properties with various anions including F-, CH3COO-, Ph-COO-, and H2PO4- were investigated by fluorescence titrations, Job plot experiments, 1H NMR spectroscopies, and ESI-MS measurements. Importantly, we have found that calix[4]arene-based sensors exhibit greatly enhanced binding affinity and selectivity toward carboxylates. The binding associations of tetrakis-(4-carbamoylphenyl)-substituted calix[4]arene for carboxylates are 1-2 orders of magnitude greater than those of the monomeric biphenylcarbamate sensor. Such an enhancement in the binding affinity and selectivity is attributed to the cooperative binding of the multiple ligating groups as revealed from the ab inito DFT calculations. Although tetrakis-(4-amidophenyl)-substituted calix[4]arene exhibited relatively weaker binding affinity toward anions, its superior binding selectivity for acetate ion over fluoride ion is evident. Our results also suggest that carbamate functionality is a useful H-bond donor for hydrogen-bonding interactions in molecular recognition and supramolecular chemistry.     

Metallized hyperbranched polydiyne: a photonic material with a large refractive index tunability and a spin-coatable catalyst for facile fabrication of carbon nanotubes

A cobalt-containing hyperbranched polydiyne shows refractive indexes (n) as high as 1.713-1.813 in the long wavelength region, which can be tuned to a large extent (Deltan up to approximately 0.048) by UV irradiation; the polymer can also function as a spin-coatable catalyst for the growth of carbon nanotubes.     

Catalytic C–H arylation of unactivated heteroaromatics with aryl halides by cobalt porphyrin

Direct C–H arylation of unactivated heteroaromatics with aryl halides catalyzed by cobalt porphyrin is reported. The reaction is proposed to go through a homolytic aromatic substitution reaction. The aryl radical is electrophilic and a SOMO–HOMO interaction is predominant in the aryl radical addition process.     

Inhibition of Inflammation‐Associated Thrombosis with ROS‐Responsive Heparin‐DOCA/PVAX Nanoparticles

Inflammation‐associated thrombosis is a non‐negligible source of mortalities and morbidities worldwide. To manipulate inflammation‐associated coagulation, nanoparticles that contain anti‐inflammatory polymer (copolyoxalate containing vanillyl alcohol, PVAX) and anti‐thrombotic heparin derivative deoxycholic acid (Hep‐DOCA) are prepared. The strategy takes advantage of the reducted side effects of heparin through heparin conjugation, achievement of long‐term anti‐inflammation by inflammation‐trigged release of anti‐inflammatory agents, and formation of PVAX/heparin‐DOCA nanoparticles by co‐self‐assembly. It is demonstrated that the Hep‐DOCA conjugate and PVAX are synthesized successfully; PVAX and Hep‐DOCA nanodrugs (HDP) are obtained by co‐assembly; the HDP nanoparticles effectively reduce the inflammation and coagulation without inducing lethal bleeding both in vivo and in vitro. The method provided here is versatile and effective, which paves new way to develop nanodrugs to treat inflammation‐associated thrombosis safely.     

Copoly(p‐phenylene) containing azacrown ether: Synthesis,optical properties,and application for chemical sensor

Copoly(p‐phenylene) ( P1 ) containing pendent azacrown ether and ethylene glycol ether was prepared by the Suzuki coupling reaction and applied for chemical sensor. Poly(p‐phenylene) derivative P0 without the azacrown ether groups were also synthesized for comparative study. The photophysical and sensing properties were investigated by absorption and photoluminescence (PL) spectroscopy to elucidate the influence of the azacrown ether groups. The P1 exhibited specific selectivity and high sensitivity toward Zn²⁺, with the Stern‐Volmer coefficient (K_sv) being 3.66 × 10⁶ M^?1 at low concentration in mixture solvent of tetrahydrofuran and water (THF/H₂O = 9/1, v/v). The P1 maintained high selectivity toward Zn²⁺ in the presence of fifteen interfering metal cations. This results indicate that copoly(p‐phenylene) ( P1 ) is a promising functional material for chemical sensors. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013 , 51, 3975–3984     

Synthesis of (Alkynyl)phenyl Porphyrins by Palladium Catalysed Cross Coupling Reactions

meso-para and meso-meta-(phenyltriflate)tritolyl porphyrins and the zinc complexes are coupled with alkynyl stannanes or terminal alkynes with palladium catalyst to give the meso-para and meta(m-alkynylphenyl)tritolylylkphenyl porphyrins as well as the zinc complex in good yields.     

Synthesis and Conformational Behavior of Dibenzo[2.2]metaparacyclophanediene

For corrigendum see DOI: 10.1002/anie.198812001 For corrigendum see DOI: 10.1002/anie.198812001 For corrigendum see DOI: 10.1002/anie.198812001 For corrigendum see DOI: 10.1002/anie.198812001 For corrigendum see DOI: 10.1002/anie.198812001