Structural Analysis of Bis(1,2-benzoquinonedioximato)platinum(II) Polymorphs Formed Epitaxially on Alkali Halides

概要

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We analyzed the crystal structures of bis(1,2-benzoquinonedioximato)platinum(II), (Pt(bqd)2), thin films fabricated by vacuum deposition on the (001) surfaces of NaCl, KCl, KBr and KI substrates at room temperature. Pt(bqd)2 thin films exhibited some polymorphs. These structures and crystallographic orientations were studied by transmission electron microscopy (TEM). On NaCl, KCl and KBr, Pt(bqd)2 grows in the $\beta$-form; unit cell dimensions are $a=2.57$ nm, $b=0.66$ nm and $c=0.37$ nm. The $\beta$-polymorph transforms into the ordinary orthorhombic $\alpha$-form by heating at different rates depending on the substrate. The instability of the $\beta$-form was influenced by lattice-matching between the $\beta$-form and substrate used. On KI, Pt(bqd)2 grows as the polymorphic tetragonal form ($\gamma$-form: $a=1.42$ nm and $c=0.656$ nm). From the result of high-resolution TEM observations, many defects or domain boundaries in this film were observed, which are related to the structural change during the growth.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2005-01-15