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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 4
BKCSDE 29(4)
April 20, 2008 

Syntheses and Structures of Two Reduced Open-framework Titanophosphates
Yongnan Zhao*, Jianguo Yu, Young-Uk Kwon*
Hydrothermal synthesis, Open-structure, Single crystal structure, Titanophosphate
Using metallic Ti powder as raw materials and 1,2-diaminocyclohexane (DACH) as the trial template, two novel reduced titanophosphate open-structures were hydrothermally isolated by varying the H3PO4/H2O ratio to adjust the pH value. TiPO-1 crystallizes in orthorhombic Pbca space group with cell parameters a = 21.956(3) A, b = 8.6268(11) A, c = 7.2883(9) A, V = 1380.5(3) A3, Z = 4. TiPO-2 crystallizes in triclinic space group P with parameters a = 5.1620(10) A, b = 8.815(2) A, c = 10.655(3) A, α = 99.45o, β = 102.94o, γ = 91.06o, V = 465.34 A3. TiPO-1 is constructed by infinite -Ti-O-Ti-O- linkage that is capped by PO4 groups to form a chain structure with protonated DACH molecules occupying the interchain spaces. TiPO-2 represents a rare 3-D reduced titanophosphate with 12-MR channels. The structure of TiPO-2 is a neutral framework with water molecules located in the channels.
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