Materials Literature
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Porphyrins with fused isoquinoline and quinoline units have been prepared by the "3 + 1" methodology. 5-Nitroisoquinoline and 6-nitroquinoline condensed with ethyl isocyanoacetate in the presence of a phosphazene base to give isoquino- and quinopyrroles, respectively. Ester saponification and decarboxylation with KOH…
Chlorins bearing synthetic handles at specific sites about the perimeter of the macrocycle constitute valuable building blocks. We previously developed methodology for preparing meso-substituted chlorin building blocks and now present methodology for preparing several complementary beta-substituted chlorin building bl…
Novel self-assembled molecular capsules were constructed from two moles of pyridine-containing porphyrin derivatives and four moles of Pd(II) complexes utilizing a pyridine-Pd(II) interaction. The (1)H NMR spectral studies established that these self-assembled molecular capsules 5 and 6 have a highly symmetrical D(4)(…
Holographic surface relief gratings (SRGs) were fabricated on composite films assembled by electrostatic layer-by-layer (ELBL) deposition of a polyelectrolyte, poly(dimethyl diallylammonium chloride) (PDAC), and an azo dye, Congo Red (CR). Surface modulation and first-order diffraction efficiency of the SRG were found…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA New Method to Synthesize Unsymmetrical Dithiolene Metal Complexes of 1,3-Dithiole-2-thione-4,5-dithiolate for Third-Order Nonlinear Optical ApplicationsJie Dai, Guo-Qing Bian, Xin Wang, Qing-Feng Xu, Min-Yan Zhou, Megumu Munakata, Masahiko Maekawa, Ming-Hong Tong, Zh…
The precipitation kinetics of hydroxyapatite from calcium phosphate aggregates was investigated by the continuous-angle laser light- scattering technique in the systems CaCl 2 −H 3 PO 4 −H 2 O and KCl−CaCl 2 −H 3 PO 4 −H 2 O at 25 °C. The apparent molecular weights of aggregates increased with time, and precipitation…
Herein we report the synthesis of a molecule that self-organizes through hydrogen bonds into discrete tetrameric capsular species, encapsulating large polycyclic guest molecules. The unique folded structure of the assembled state is determined by correlation spectroscopy in conjunction with molecular modeling. Pendant…
The reaction of the four-coordinate picket fence iron(II) porphyrin complex [Fe(TpivPP)] with cryptand-solubilized KNO 2 yields the five-coordinate porphyrin species [Fe(TpivPP)(NO 2 )] - . The six-coordinate complexes, [Fe(TpivPP)(NO 2 )(PMS)] - and [Fe(TpivPP)(NO 2 )(Py)] -, are obtained when pentamethylene sulfide…
A detailed analysis of the Bragg as well as of the diffuse X-ray diffraction scattering of isotactic polypropylene (i-PP) fiber samples, suitably crystallized in the α form under different conditions, is reported. A limit-ordered (α 2 form) and a limit-disordered (α 1 form) model structure have been described to accou…
Experimental literature data on the chemically and thermally activated decomposition of sec -C 4 H 9 radical were analyzed by weak collision master equation modeling. A reaction model with very little flexibility in its properties was created on the basis of ab initio calculations and experimental kinetic and thermoch…
The wetting behavior of thin films of symmetric poly(styrene- b -methyl methacrylate) was investigated on self-assembled (SA) films of octadecyltrichlorosilane on Si/SiO x with varying grafting density. The different types of SA organic films were produced by changing the deposition times ( t ) in solution. Two types…
Films were prepared at neutral pH from deamidated gluten by casting with or without enzymatic treatment by transglutaminase in the presence of various concentrations of diamines added to the film-forming solution. Variation in the glycerol/deamidated gluten ratio from 0.2 to 0.5 had a major effect on the film mechanic…
An isotactic polypropene (i-PP) prepared with a metallocene catalyst system and two random copolymers of propene and ethene with 2.8 and 5.7 wt % ethene, respectively (PP- co -E-2.8, PP- co -E-5.7), were isothermally crystallized during simultaneous small- and wide-angle X-ray scattering (SAXS, WAXS) in synchrotron me…
Anionic axial ligands bound to an iron(III) porphyrin complex, Fe(TMP)X, showed a marked influence on the formation of oxoiron(IV) porphyrin intermediates in the reactions of PhIO and m-CPBA.
The hydrothermal reactions of Na2MoO4 x 2H2O and 2,2':6',2"-terpyridine with appropriate salts of Fe(II), Cu(II), and Zn(II) yield a variety of mixed metal oxide phases. The Cu(II) system affords the molecular cluster [Cu(terpy)MoO4].3H2O (MOXI-40 x 3H2O), as well as a one-dimensional material [Cu(terpy)Mo2O7](MOXI-41…
Blends of small particle size fluorinated acrylic copolymer latexes with a large particle size styrene/acrylic copolymer latex were examined with regard to formation of low free energy surfaces, amount of incorporated fluorinated copolymer, particle size, and particle size asymmetry. The styrene/acrylic latex was prep…
Hydrolysis and condensation of (CH 3 COCHCOCH 3 ) 2 SnF(O tert -Am) and (CF 3 COCHCOCH 3 ) 2 Sn(O tert -Am) 2 gave soluble stannic oxo-oligomers or -polymers including fluorine and β-diketonate groups. Under thermal treatment in air at 550 °C, they yielded nanocrystalline fluorine-doped tin dioxide powders. The amount…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correctionControlling β-Sheet Assembly in Genetically Engineered Silk by Enzymatic Phosphorylation/Dephosphorylation, byS. Winkler, D. Wilson, and D. L. KaplanCite this: Biochemistry 2000, 39, 45, 14002Publication Date (Web):October 2…
The synthesis, crystal structure, magnetic properties, and Mössbauer spectra of [Fe(bpb)2(NCS)2]·0.5CH3OH (1) (bpb = 1,4-bis(4-pyridyl)-butadiyne) are reported. 1 is a singular example of the interpenetration of three mutually perpendicular nets with spin crossover properties.
In this paper, we describe the synthesis of novel amphoteric azopyridine carboxylic acids ( 2b, 3a, 3b, 4a, and 4b ), having both a carboxyl group as a hydrogen donor and a pyridyl group as an acceptor at each molecular terminus, and their self-organization, which is markedly affected by external stimuli including hea…