Synthesis and Structure Determination of ETS-4 Single Crystals Academic Article uri icon


  • We report the hydrothermal synthesis of 10 m 100 m 10 m single crystals of the microporous titanosilicate sodium-ETS-4. The crystallization of large needle-shaped Na-ETS-4 crystals is preceded by the formation and subsequent dissolution of the titanosilicate GTS-1. Large Na-ETS-4 crystals are obtained with purity higher than 97%. The structures of Na-ETS-4 and its Sr ion-exchanged form are solved from single-crystal X-ray diffraction data. It is suggested from the structure solution and further supported by the results of the empirical bond valence model that the bridging unit of ETS-4 contains five-coordinate titanium(IV). Infrared spectroscopy is also used to support the crystallographic results, with regard to the presence of charge-balancing protons and five-coordinate titanium. ETS-4 is, thus, one of only two synthetic titanosilicate materials containing five-coordinate titanium. We also discuss some structural differences between ETS-4 and its natural analogue, zorite.

published proceedings

  • Chemistry of Materials

author list (cited authors)

  • Nair, S., Jeong, H., Chandrasekaran, A., Braunbarth, C. M., Tsapatsis, M., & Kuznicki, S. M.

citation count

  • 89

complete list of authors

  • Nair, Sankar||Jeong, Hae-Kwon||Chandrasekaran, Annamalai||Braunbarth, Carola M||Tsapatsis, Michael||Kuznicki, Steven M

publication date

  • November 2001