4th EucheMs chemistry congress

wednesday, 29-Aug 2012
s846
chem. Listy 106, s587–s1425 (2012)
solid state Chemistry Materials chemistry/New materials
Novel Materials and Molecular interactions
o - 4 1 6
A new MonAzite PhASe forMed froM
StrontiuM fLuoroPhoSPhAte
J. rutter 1 , A. wriGht 1
1 University Of Birmingham, School of Chemistry, Birmingham,
United Kingdom
Fluorophosphates (PO F 3 2- ) are a fluorine derivative to an
3- orthophosphate (PO ), with the tetrahedral unit possessing at
4
least one P-F bond. Although these materials have been known
since the early 1920’s, with a number of uses, particularly in
dental care, their exploitation as a structural building block to new
materials has been limited. To date, fewer than 25 structurally
characterized monofluorophosphates have been reported.
Our research has initially focused on the substitutional
3- chemistry possible when PO is replaced by PO3F 4
2- . To this end,
we report the novel synthesis of a monazite structured SrPO F, 3
formed from a readily available PO F 3 2- precursor via a
precipitation reaction.
Detailed structural studies, performed using neutron powder
diffraction, X-ray fluorescence and Raman spectroscopy confirm
SrPO F adopts the important monazite structure type (MXO ),
3 4
which is more commonly associated with rare earth phosphates
[1] such as LaPO . This compound crystallises with space group
4
(P2 /n) and unit cell parameters a = 6.97293(6) ?,
1
b = 7.11850(5) ?, c = 6.71991(5) ? and β = 101.7629(7)°. The
structure consists of distorted PO F 3 2- tetrahedron which form
chains both parallel and perpendicular to the a axis, with an
apparent ordering of the P-F bond and consequently the
orientations of the distorted PO F 3 2- tetrahedra. This study also
investigates the stability of these new materials.
references:
1. N. Clavier, R. Podor and N. Dacheux, J. European Ceram.
Soc., 2011, 31, 941-976.
Keywords: Materials Science;
Novel Materials and Molecular interactions
4 th EucheMs chemistry congress
o - 4 1 7
hiGhLy PorouS CArBon MAteriALS froM
diCyCLoPentAdiene hiGh internAL PhASe
eMuLSionS (hiPeS)
S. KovACiC 1 , n. MAtSKo 2 , C. SLuGovC 1
1 Graz University of Technology, Institute for Chemistry and
Technology of Materials, Graz, Austria
2 Graz Centre for Electron Microscopy, Graz Centre for
Electron Microscopy, Graz, Austria
Email: s.kovacic@tugraz.at
The present work relates to the preparation of a threedimensional
carbonaceous polyHIPE material using a high
internal phase emulsion (HIPE) templating technology. Porous
carbonaceous materials represent outstanding candidates for a
range of applications such as water and air purification,
adsorption, catalysis, electrodes and energy storage materials [1] .
Using high internal phase emulsion (HIPE) templating
technology [2] , porous carbonaceous materials can be obtained after
the carbonization and the pyrolysis with fully accessible network,
high (macro)pore volume of up to 10 cm3 /g and in a different
shapes.
Carbon precursor used in present work is an economically
interesting monomer while it is a by-product of steam cracking of
naphta and gas oils namely dicyclopentadiene (DCPD) which is
cheap and readily available. PolyDCPD HIPEs posses very
favourable mechanical properties. [3] After the pyrolysis material
undergoes major dimensional shrinkage (by factor of 2) however,
interconnected porous morphology is completely maintained whit
additional microporosity in the polymer walls.
references:
1. Suramoney S., Adv. Mater. 1998, 10, 1157-1171.
2. Cameron, N. R., J. Chrom. Libr., 2003, 67, 255-276.
3. a) Kovacic, S., Krajnc, P., Slugovc, C. Chem. Commun.
2010, 46, 7504-7506,
b) Kovacic, S., Jerabek K., Krajnc, P., Slugovc, C. Polym.
Chem. 2012, 3, 325-328.
Keywords: microporous carbon polymers; ring opening
metathesis polymerization;
AUGUst 26–30, 2012, PrAGUE, cZEcH rEPUbLIc