title: Cellulose derivatives modified by sodium tellurate and a chromium(III) tellurate complex.
abstract: A novel cellulose (Cell) derivative, sodium-tellurato (Cell-TeO(OH)4(ONa)/Cell-Cl), has been synthesized from the reaction of 6-chloro-6-deoxycellulose (Cell-Cl) with telluric acid in the presence of sodium hydroxide. The subsequent reaction of this polymeric material with chromium(III) in aqueous solution yields the [Cr(Cell-TeO3(OH)3/Cell-Cl)(Cell-TeO2(OH)4/Cell-Cl)(H2O)3] complex. The molecular structures and morphology of the new polymer and the Cr(III) complex have been examined using elemental analysis, solid-state (13)C NMR, UV-vis, XRD and FTIR spectroscopy, and SEM-EDX, TGA and magnetic measurements. The results are considered to be consistent with the formulations proposed. The deprotonation constants of the modified cellulose and the stability constant of the Cr(III) complex have been determined by pH-metric measurements.
authors.affiliation: Department of Chemistry, McGill University, Montreal H3A 2K6, QC, Canada. Electronic address: ian.butler@mcgill.ca.
authors.forename: Ian S
authors.initials: IS
authors.lastname: Butler
authors.affiliation: Chemistry Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt.
authors.forename: Heba Allah M
authors.initials: HA
authors.lastname: El-Sherbeny
authors.affiliation: Chemistry Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt.
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Kenawy
authors.affiliation: Chemistry Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt. Electronic address: sihmostafa@gmail.com.
authors.forename: Sahar I
authors.initials: SI
authors.lastname: Mostafa
mesh_terms: D002482:Cellulose / Q000031:analogs & derivatives / Q000138:chemical synthesis* / Q000737:chemistry; D002857:Chromium / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D009682:Magnetic Resonance Spectroscopy; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D011522:Protons; D013691:Tellurium / Q000737:chemistry*
chemical_list: D011108:Polymers; D011522:Protons; D002857:Chromium; C032039:sodium tellurate(IV); D002482:Cellulose; C026660:tellurous acid; D013691:Tellurium
keywords: Chromium(III); Complex; Modified cellulose; Spectroscopy; Telluric acid