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Synthesis, X-ray Crystal Structure, and Photochromism of a Sandwich-Type Mono-Aluminum Complex Composed of Two Tri-Lacunary ?-Dawson-Type Polyoxotungstates.

ABSTRACT: The synthesis and molecular structure of a dimeric, mono-aluminum complex composed of two tri-lacunary ?-Dawson polyoxometalates, [H14Al(B-?-P2W15O56)2]7- (1), is described herein. The tetra-n-butylammonium salt of 1, [(n-C4H9)4N]7[H14Al(B-?-P2W15O56)2] (TBA-1) was prepared by passing an aqueous solution of K6[B-?-H3P2W15O59{Al(OH2)}3]?14H2O through an ion-exchange resin column (H+-form), followed by addition of tetra-n-butylammonium bromide. Analytically pure and colorless crystals of TBA-1 were obtained via vapor diffusion from acetonitrile/methanol at ~25 °C. Single-crystal X-ray structure analysis revealed that a six-coordinate aluminum ion was sandwiched between two tri-lacunary ?-Dawson-type units, resulting in an overall C2h symmetry. The characterization of TBA-1 was accomplished by elemental analyses, thermogravimetric/differential thermal analyses, Fourier-transform infrared spectroscopy, and solution 31P nuclear magnetic resonance spectroscopy. The photochromic properties of TBA-1 were also characterized in methanol under light irradiation (? = 365 nm and ?400 nm).

SUBMITTER: Kato CN 

PROVIDER: S-EPMC6696191 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature

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Synthesis, X-ray Crystal Structure, and Photochromism of a Sandwich-Type Mono-Aluminum Complex Composed of Two Tri-Lacunary α-Dawson-Type Polyoxotungstates.

Kato Chika Nozaki CN   Kato Daichi D   Kashiwagi Toshifumi T   Nagatani Shunpei S  

Materials (Basel, Switzerland) 20190726 15

The synthesis and molecular structure of a dimeric, mono-aluminum complex composed of two tri-lacunary α-Dawson polyoxometalates, [H<sub>14</sub>Al(B-α-P<sub>2</sub>W<sub>15</sub>O<sub>56</sub>)<sub>2</sub>]<sup>7-</sup> (1), is described herein. The tetra-<i>n</i>-butylammonium salt of 1, [(<i>n</i>-C<sub>4</sub>H<sub>9</sub>)<sub>4</sub>N]<sub>7</sub>[H<sub>14</sub>Al(B-α-P<sub>2</sub>W<sub>15</sub>O<sub>56</sub>)<sub>2</sub>] (TBA-1) was prepared by passing an aqueous solution of K<sub>6</sub  ...[more]

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