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91.
Munakata H Oyamatsu D Kuwabata S 《Langmuir : the ACS journal of surfaces and colloids》2004,20(23):10123-10128
Self-assembled monolayers (SAMs) of alkanethiols having various terminal groups on their omega-positions were formed on a Au111 electrode, and their reductive desorption was studied by linear sweep voltammetry, focusing on effects of solution pH on the desorption behavior. The peak potentials (Ep) of cathodic waves representing reductive desorption were found to be reflected by the pKa value of the thiol group and were negatively shifted with an increase in pH of the electrolyte solution. The magnitude of the pH dependency of Ep was greatly influenced by the hydrophobicity of the terminal groups. In the cases of alkanethiol SAMs having pH-sensitive terminal groups such as carboxyl and amino groups, their basicity was estimated from bending points appearing in the pH titration profile of Ep. This method allows direct determination of not only the pKa value of the arrayed groups but also that of the groups dissolved in solution simultaneously. The pKa values of the arrayed carboxyl groups in SAMs were larger by ca. 3 pH units than their original ones, while those for amino groups were smaller by ca. 2 pH units. 相似文献
92.
Konaka H Wu LP Munakata M Kuroda-Sowa T Maekawa M Suenaga Y 《Inorganic chemistry》2003,42(6):1928-1934
Five novel silver(I) coordination polymers with cis-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3- thienyl)ethene (cis-dbe) were synthesized and are characterized in this paper. Treatment of AgCF(3)SO(3) or AgCF(3)CO(2) with cis-dbe afforded [Ag(2)(cis-dbe)(CF(3)SO(3))(2)] (1) and [Ag(2)(cis-dbe)(CF(3)CO(2))(2)] (2), and both complexes exhibit a 1-D infinite chain structure with two cyano groups and two thienyl groups of the ligand bridging four metal ions. Reaction of AgC(n)()F(2)(n)(+1)CO(2) with cis-dbe gave rise to an unprecedented cocrystallization of a 2-D sheet structure, [Ag(2)(cis-dbe)(C(n)F(2)(n)(+1)CO(2))(2)], where n = 2 (3), 3 (4), and 4 (5). Upon irradiation with 450 nm light, these five silver(I) complexes turned orange or red from yellow, and the color reverted to yellow on exposure to 560 nm light, indicative of the reversible cyclization/ring-opening reaction occurring in the crystalline phase. Furthermore, different anions gave not only the different structural dimensions but also the different photoresponsive patterns. The correlation between the crystal structures and the photochromic reactivity is discussed. 相似文献
93.
Han J Maekawa M Suenaga Y Ebisu H Nabei A Kuroda-Sowa T Munakata M 《Inorganic chemistry》2007,46(8):3313-3321
Three new metal complexes with 1,2-bis(2'-methyl-5'-(carboxylic acid)-3'-thienyl)perfluorocyclopentene (BM-5-CATP) were synthesized and characterized by X-ray diffraction analysis. BM-5-CATP serves as a bis-monodentate ligand that bridges metal centers to generate three 1D polymers. The two thienyl rings in the three complexes adopt antiparallel fashions, and the distances of 3.39, 3.53, and 3.57 A between the two reactive carbons are short enough to allow photocyclizations to occur in the crystalline phase. [Co(BM-5-CATP)(py)2(MeOH)2] (1) displayed effective photoisomerization in the crystalline phase. Interestingly, solvated 1 underwent a solid-state conversion upon heating to generate, through the release of the coordinated MeOH and rearrangement of the coordination geometry, the desolvated form (1a), while maintaining reversible photochromism. The removal of the solvent led to obvious changes in physical properties such as color and magnetic properties. The ESR spectra of 1 and 1a changed reversibly upon photoexcitation, indicating changes in coordination geometry accompanied by photoreaction. The magnetic susceptibilities of 1 and 1a showed no obvious changes, suggesting that the cobalt-cobalt interaction through the long bridging BM-5-CATP is less effective. Both [Cu(BM-5-CATP)(py)3](EtOH)(py)1.8 (2) and [Zn(BM-5-CATP)(phen)(H2O)] (3) exhibited reversible photoreactions in the crystalline phase. However, 3 did not show remarkable spectral changes because of steric hindrance from the coordinated bulky phenanthroline and the intramolecular H bonds. 相似文献
94.
Maekawa M Konaka H Minematsu T Kuroda-Sowa T Munakata M Kitagawa S 《Chemical communications (Cambridge, England)》2007,(48):5179-5181
Three novel Cu(I) metallacalixarenes with C(2)H(4) and CO legs, in which an anion is accommodated in the inside cavity, were self-assembled by anion templation and have been structurally characterized. 相似文献
95.
Nakamura A Munakata K Kochi T Nozaki K 《Journal of the American Chemical Society》2008,130(26):8128-8129
An alternating copolymer of methyl acrylate with carbon monoxide has been synthesized for the first time via coordination polymerization using palladium complexes of phosphine-sulfonic acid as catalysts. The highly controlled head-to-tail structure of the copolymer was confirmed by NMR spectra. Subsequent insertion of carbon monoxide and methyl acrylate to methylpalladium species provided gamma-ketoalkylpalladium 2. The present system apparently conquered the difficulty in coordination-insertion of CO to 2. 相似文献
96.
Harada K. Munakata K. Itoh M. Yoshikawa N. Umegaki S. Yatagai T. 《Optical and Quantum Electronics》2000,32(12):1351-1358
Spatial filtering using poled polymer light modulators is studied. The use of a resonator structure is proposed to minimize the driving voltage. Side-chain polymer poly-orange tom-1 isophoronedisocyanate is used as a material. The measured electro-optic coefficient r
33 is 23 pm/V at the wavelength of 633 nm. Spatial filtering of the input images are realized with 30 V applied voltage. 相似文献
97.
The 2D porous copper(Ⅰ) complex with 1,3-dicyanobenzene (DCB), [Cu(DCB)2](PF6)(Me2CO) 1, exhibits channels along axis c, in which one molecule acetone and one anion PF6 per formula unit are included respectively. The reversible incorporation of guest acetone and acetonitrile, as well as the anion exchange from PF6^- to BF4^- or CF3SO3^-, was investigated by thermogravimetric (TG) analysis, ^1H NMR spectra and/or infrared absorption spectroscopy. Additionally, the incorporation of benzene and toluene into complex 1 was also discussed. Complex 1 exhibited size selectivity for guest inclusion or anion exchange. 相似文献
98.
99.
Harada K. Munakata K. Itoh M. Umegaki S. Yatagai T. 《Optical and Quantum Electronics》2002,34(12):1183-1189
An electrically addressed spatial light modulator with 5 × 5 pixels is designed using nonlinear polymeric materials. Resonator structure for the material is proposed to minimize the driving voltages. Side-chain polymer poly-orange tom-1 isophoronedisocyanate (r
33 = 23 pm/V) is used as a material. A modulation efficiency of 4.7% has been realized with 5.1 Vrms applied voltage at a wavelength of 633 nm. Very fast modulation at over 10 MHz has been demonstrated. 相似文献
100.
Yi Ding Qing Chen Jian-Chu Zhong Megumu Munakata Hisashi Konaka Gui-Ling Ning Hong-Zhi Wang 《Polyhedron》2008
Two novel 3D coordination polymeric networks based on Ag(I) and TTF derivatives, [Ag4(tces-TTF)2(CF3SO3)2](CF3SO3)2 (tces = 2,3,6,7-tetra(cyanoethylsulfanyl)) (1) and [Ag2(bmdt)2](SbF6)2 · acetone (bmdt = 4,5-bis(methylsulfanyl)-1,3-dithiole-2-thione) (2), were synthesized and crystallographically characterized. Both 1 and 2 have axially chiral helical motifs and these helices were assembled in a similar way: spiral up along b axis infinitely. In addition, complex 2 forms a “cds” network with a topology of 65.8. The conductivity of complex 1 was measured at RT with a σ value of 3.47 × 10−6S cm−1 due to the S?S contacts in the molecules, while 2 is an insulator at RT. 相似文献