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particles. Out of the solutions of common (OMe) on the para position of the C-2 aryl moiety
chemicals (10% caustic soda, 20% sodium
chloride, 10% sodium carbonate, 10% postassium
dihydrogen phosphate, 10% TSP and 5% NH 3)
only 10% caustic soda leach~95%. As from As
loaded brick particles and others much less.
Ordinary water within pH 4-7 leach very little
arsenic from iron oxide impregnated brick
particles.
058 KIBRIA, A.K.M.F. (Chemistry Division,
Atomic Energy Centre, Ramna, Dhaka);
SHAJAHAN, M. & NAHAM, K.S. (School of
Chemical Engineering & Technology, Chonbuk
National University, Chonju, Republic of Korea).
SYNTHESIS, CHARACTERIZATION. PURIFICATION
AND FIELD EMISSION PROPERTY
MEASUREMENT OF CARBON NANOTUBES. J.
Bang. Acad. Sci., 2007, 31 (2), 239-245.
Carbon nanotubes (CNTs) were synthesized over
15 Co: 15 Mo:70 MgO impregnated catalyst at
800°C from thermal decomposition of C 2H 2 for 0.5
h. The yield of CNTs was 335%. The grown tubes
are MWNTs and were grown by tip growth mode.
The gown tubes were purified and characterized. It
was observed that acid leaching successfully
removed the impurities from the as-grown CNTs.
The diameter of the tubes is around 10 nm. In field
emission display (FED) study, the grown tubes
showed turn on voltage at the electric field of 3.17
V/µm. The calculated field enhancement factor (β)
is 5054 which indicates better suitability of the
lubes for the FED application.
059 NURNABI, M. & ISMAIL, M. (Dept.
of Applied Chemistry and Chemical Technology,
Dhaka University, Dhaka). Syntehsis of
Biologicaly Important Chiral Morpholine
Derivatives. Bang. J. Sci. Ind. Res., 2007, 42 (2),
135-146.
Electrophile (Br 2) induced cyclization of optically
pure N-allyl-β-aminoalcohols la, 1b, Ic and 2a, 2b
gave chiral morpholines (2R, 5S)-3a, 3b, 3c and
(2S, 5R)-4a, 4b respectively. Quenching of the
reaction with Na 2CO 3 after 5 min afforded 60 %
conversion with 100 % de, whilst a 2:1 mixture of
two diastereomers was obtained upon complete
conversion. However, electron donating substituent
16
(substrates Ib and 2b) accelerates the reaction to
give 80 % conversion and 50 % isolated yield of
single diastereomer after 5 min and 8:1 mixture of
diastcreomers on complete conversion after 10
min.
060 PALMA, B.S.; AZIM, M.A.; ISMAIL,
M.; SAHA, D.; KADER, M.A. & SAHA, M.
(Dept. of Applied Chemistry and Chemical
Technology, Dhaka University, Dhaka). A
Mathematical Model for the Indanylation of m-
Cresol with Indene in the Presence of
Benzenesulphonic acid. Bang. J. Sci. Ind. Res.,
2007, 42 (1), 1-8.
A mathematical model has been developed for the
reaction of m-cresol with indene in the presence of
benzenesulphonic acid as a catalyst using Yates
pattern experimental design and indanyl m-cresol
has been obtained in high yield.
061 QUAYUM, M.E. (Dept. of Chemistry,
Dhaka University, Dhaka). ELECTROLESS
DEPOSITION OF GOLD ONTO HYDROGEN
TERMINATED n-Si(111) ELECTRODE. J. Bang.
Acad. Sci., 2006, 30 (2),151-157.
Electroless deposition of gold on hydrogen
terminated Si(lll) electrode has been investigated in
O.1 M H 2SO 4 solution containing 0.5 mM of
AuCl 4 ions hy using attenuated total reflection
Fourier transform infra-red (ATR FT-IR)
spectroscopy and X-ray photoelectron
spectroscopy) (XPS) Gold deposits on Si(111)
surface without the influence on any external
potential i.e., at Open Circuit Potential (OCP). It is
interpreted that gold deposition takes place via
hole injection into the valence band (VB). The
formation of gold film and oxide layers on H-
Si(111) surface proceeds simultaneously.
062 RAHMAN, A.B.M.S. (Dept. of
Chemistry, Janahgirnagar University, Savar,
Dhaka) & BOLLER, H. (Dept. of General &
Inorganic Chemestry, Johannes Keppler
University, Linz, Altenberger, Austria).
POLYMERS OF [MS 4] (M = Mo, W) WITH Cu(I)
2-
AND Ag(I): SYNTHESIS AND CHARACTERIZATION
OF [Me 4N][CuMS 4] AND [Me 4N][AgMS 4] AND
THEIR POLYMERIC CHAIN BREAKING