title: Synthesis and temperature-induced morphological control in a hybrid porous iron-phosphonate nanomaterial and its excellent catalytic activity in the synthesis of benzimidazoles.
abstract: A new organic-inorganic hybrid porous iron-phosphonate material, HPFP-1, has been synthesized under hydrothermal conditions by using hexamethylenediamine-N,N,N',N'-tetrakis-(methylphosphonic acid) (HDTMP) as the organophosphorus precursor. The morphology of this material was found to be different at three different temperatures. The material that was synthesized at 453 K showed a flake-like particle morphology and the material was highly crystalline. Whereas, the materials that were synthesized at 443 K and 423 K were semi-crystalline and showed rod-like- and spherical morphological features, respectively. SEM and TEM were employed to understand this change in particle morphology depending on the reaction temperature. Powder XRD analysis suggested the formation of a new tetragonal phase in HPFP-1 (a=11.313, c=15.825 Å; V=2025.659 Å(3)). N(2)-sorption analysis suggested the existence of supermicropores and interparticle mesopores in these materials. Elemental- and thermal analyses, as well as FTIR spectroscopy, were employed to verify the composition and framework bonding of the material. The HPFP-1 material showed excellent catalytic activity for the synthesis of benzimidazole derivatives under mild liquid-phase reaction conditions.
authors.affiliation: Department of Materials Science, Indian Association for the Cultivation of Science, 2A and 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, India.
authors.forename: Arghya
authors.initials: A
authors.lastname: Dutta
authors.forename: John
authors.initials: J
authors.lastname: Mondal
authors.forename: Astam K
authors.initials: AK
authors.lastname: Patra
authors.forename: Asim
authors.initials: A
authors.lastname: Bhaumik