A new chalcogenide ion-exchanging material:: Porous indium sulfide built from condensed [In10S18]6- T3 supertetrahedral clusters

A new open framework indium sulfide, In10S18[(H2O)(4)(C6H18N4H2)(1.5)(C6H18N4H3)] (SCU-1), has been synthesized under hydrothermal conditions. X-ray diffraction (XRD), infrared spectra (IR), scanning electron microscope (SEM), thermogravimetric analysis (TGA) and elemental analysis were employed for the characterization of SCU-1. The resultant crystallizes in the tetragonal space group P4(1)2(1)2 (No. 92) with a=b=19.702(2) angstrom, c=31.509(5) angstrom, V= 12,231(3) angstrom(3), and Z=8. The crystal framework has a large pore volume of more than 51%. The charge balance of the anionic framework [In10S18](6-) is maintained by the template cations in the cavity spaces. The framework remained at higher crystallinity after about 90% of the extra-framework amines were removed by exchanging with K+. The as-synthesized material can undergo ion exchange with various metal cations in the selectivity series as Cu2+ > Cr3+ > Cs+ > Zn2+ > CO2+ > Sr2+ > Mn2+ with the total ion exchange capacity (IEC) of 0.59 mmol/g. (C) 2008 Elsevier B.V. All rights reserved.