Synthesis and characterization of rare earth borophosphates

Özdil, Yasemin
In this thesis, solid state reactions of Ln2O3, Y2O3, B2O3 and (NH4)2HPO4 were investigated to synthesize LnBP2O8 (Ln= Dy, Ho, Er) and YBP2O8 type of borophosphates which were not reported before. The products were analyzed by XRD, IR, DTA, SEM and EDX methods. In the first part of this thesis, synthesis of YBP2O8 through the solid state reaction of Y2O3 + 4(NH4)2HPO4 + B2O3 have been studied in the range 800-1140 °C. Orthophosphates of Dysprosium, Holmium, Erbium and Yttrium have tetragonal xenotime (YPO4) or zircon (ZrSiO4) structure. Examination of X-ray powder diffraction data at 1140 ðC showed that the obtained structure was xenotime type together with weak BPO4 and Y(PO3)3 lines. The formula was calculated as YBxP1+xO4+4x through EDX and XRD data. The pattern was indexed in tetragonal system with the unit cell parameters of a= 6.8863, c= 6.016 Å and s.g. is I41/amd. In the second part of this research, synthesis of LnBP2O8 through the solid state reaction of Ln2O3 + 4(NH4)2HPO4 + B2O3 (Ln= Dy, Ho, Er) have been studied in the range 800-1200 ðC. At 1200 ðC DyBP2O8 was obtained with tetragonal structure with the unit cell parameters of a= 6.905, c= 6.051 Å and s.g. I41/amd. Using the same procedure HoBP2O8 was obtained at 1100-1200 ðC and the XRD pattern was indexed in tetragonal system with the unit cell parameters of a= 6.887, c= 6.024 Å and s.g. I41/amd. In the structural analysis of ErBP2O8 obtained by the same reaction, the system was found as tetragonal and was indexed with a= 6.849, c= 5.998 Å and s.g. I41/amd. Examination of the unit cell parameters with respect to ionic radius showed that the unit cell parameters decrease depending on the lanthanide contraction. The structures of the compounds obtained throughout this thesis were examined by IR spectroscopy and relation between the spectra and IR vibrational modes were established. The presence of


Synthesis of iron borophosphates and phosphates with zeo-type structures
Tuncel, Selcan; Kızılyallı, Meral; Department of Chemistry (2004)
New iron phosphate and borophosphate compounds were synthesized and characterized by single crystal/powder X-ray diffraction, infrared spectroscopy, raman spectroscopy, thermogravimetric analysis, electron microscopy and elemental analysis. Using several compositions, Fey B(PO4)x type of compounds were attempted to be prepared by solid state reactions. The solid state reactions of boron compounds with a phosphating agent has been completed at 950oC. A new product Fe2BP3O12 is synthesized and indexed in this...
Synthesis and biological evaluation of optically active conjugated gamma- and delta-lactone derivatives
ŞARDAN, Melis; Sezer, Serdar; GUNEL, Aslihan; AKKAYA, MAHİNUR; Tanyeli, Cihangir (2012-09-15)
An efficient synthesis of racemic and both enantiomeric forms of heteroaryl substituted gamma- and delta-lactone derivatives derived from allyl and homoallyl alcohol backbones has been accomplished via ring closing metathesis reaction. 2-Heteroaryl substituted allyl and homoallyl alcohols have been efficiently resolved through enzymatic method with high ee (97-99%) and known stereochemistry. Antimicrobial and antioxidant activities of target lactones were evaluated.
Synthesis and characterization of a new soluble conducting polymer and its electrochromic devices
Sahin, Elif; Sahmetlioglu, Ertugrul; Akhmedov, Idris M.; Tanyeli, Cihangir; Toppare, Levent Kamil (Elsevier BV, 2006-10-01)
A new polythiophene derivative was synthesized by both chemical and electrochemical oxidative polymerization of 1-(perfluorophenyl)-2,5-di(2-thienyl)-1H-pyrrole (FPTPy). The structures of both the monomer and the soluble polymer were elucidated by nuclear magnetic resonance (H-1-NMR) and fourier transform infrared (FTIR). Polymer of FPTPy was also synthesized via potentiostatic electrochemical polymerization in acetonitrile (AN)/NaClO4/LiClO4 (0.1 M:0.1 M) Solvent-electrolyte couple. Characterizations of th...
Synthesis of aromatic poly(pyridinium salt)s and their electrochromic properties
Keshtov, M. L.; UDUM, YASEMİN; Toppare, Levent Kamil; Kochurov, V. S.; Khokhlov, A. R. (Elsevier BV, 2013-05-15)
Synthesis of a series of new conjugated electrochromic polymeric pyridinium salts containing main-chain triphenylamine and their electrochromic properties were demonstrated. All polymers exhibit intense UV absorptions at 336-338 nm in DMF and 340-343 nm in thin film form and fluorescence centered at 410-438 nm in DMF and 460-461 nm in thin film form. The electrochromic properties of the films were investigated by electrochemical and spectroelectrochemical methods. Reversible redox signals with stable electr...
Synthesis, Characterization and Optoelectrochemical Properties of Poly(2,5-di(thiophen-2-yl)-1-(4-(thiophen-3-yl)phenyl)-1H-pyrrole-co-EDOT)
Turac, Ersen; Sahmetlioglu, Ertugrul; Toppare, Levent Kamil; Yuruk, Huseyin (Informa UK Limited, 2010-01-01)
A new polythiophene derivative was synthesized by electrochemical oxidative polymerization of 2,5-di( thiophen-2-yl)-1-(4-(thiophen-3-yl) phenyl)-1H-pyrrole (TTPP). The structure of the monomer was evaluated by H-1-NMR and FT-IR. The polymer (P(TTPP)) and its co-polymer with 3,4-ethylenedioxythiophene (P(TTPP-co-EDOT)) were synthesized via potentiostatic electrochemical polymerization. The resulting polymers were characterized by cyclic voltammetry (CV), FT-IR, SEM and UV-Vis spectroscopy, and conductivity ...
Citation Formats
Y. Özdil, “Synthesis and characterization of rare earth borophosphates,” M.S. - Master of Science, Middle East Technical University, 2004.