Size Determination of Catena-μ-2,5-dihydroxy-p-benzoquinonatonickel(II) Coordination Polymer Colloid and Its Photochemical Reaction
✍ Scribed by Hirokazu Miyoshi; Mitsuhiro Matsumoto; Seiichi Kanda
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 158 KB
- Volume
- 193
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
tonickel(II) [dhqNi(II)] was expected to be a straight one-Electric birefringence and streaming dichroism measurements of dimensional coordination polymer as the most probable catena-m-2,5-dihydroxy-p-benzoquinonatonickel(II) [dhqNi(II)] model, with a dhq 20 quadruply coordinated in a plane to aqua sol suggested that the average length of the sol particles was two Ni 2/ ions (1a,b). Two coordinated water molecules per ca. 380 nm and the axial ratio was 2.0-2.3 as the prolate spheroid. Ni 2/ were located above and below the Ni 2/ ions, where
The average particle length in the scanning microscopic images was 370 { 60 nm and the axial ratio 2.3 { 0.6. This aqua colloid the H
was decomposed by UV irradiation under an O 2 gas atmosphere, but under a N 2 gas atmosphere its decomposition was depressed.
Furthermore, addition of sacrificial reagents such as L-ascorbic plane from both dhq 20 ions, as shown in Fig. 1 (2). Howacid depressed the decomposition. These facts suggested that the ever, its shape and real size in the aqua sol have not yet photogenerated electron originating from the irradiated dhqNi(II) been determined. Because of the periodic catena-m structure colloidal particle reduced O 2 , while the positive hole on the colloid in the polymer chain of the dhqNi(II) complex, an energy oxidized dhqNi(II) itself. It was found that the reduction product band structure and delocalization of electrons were expected. from O 2 reduced Cr 6/ (in Cr 2 O 20 7 ) to Cr 3/ , and the oxidized Presumably the electronic band structure reveals itself as dhqNi(II) oxidized I 0 to I 2 /2. Therefore, H 2 O 2 formation was broad strong absorption bands in UV-visible region, as proposed as the photochemical reduction product. ᭧ 1997 Academic shown in Fig. 2. The photogenerated electrons would be Press delocalized in the conjugated double-bond system of