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REACTIONS WITH M΄CN (M΄ = Cu, Ag) TO Catalysed Condensation Reaction. Bang. J. Sci.
FORM CLUSTER COMPLEXES. J. Bang. Acad. Ind. Res., 2007, 42 (1), 9-14.
Sci,. 2006, 30 (2),203-212. Propanone (acetone) was dimerised to obtain 4-
hydroxy-4-melhylpentanone-2 (diacetone alcohol)
Thiomolybdate (VI) and thiotungstate (VI) anions, in reasonably good yields in presence of metal
2-
[MS 4] , react with Cu(l)halides in 1:1 molar ratio catalyst viz aluminium, iron, tin and zinc at
at the boiling point of MeOH to give insoluble red- different catalytic conditions—pure metal,
brown and orange-yellow solids of polymers activated metal and amalgamated metal. Yields of
[Me 4N][CuMoS 4] 1 and [Me 4N][CuWS 4] 2, the product was found to decrease exponentially
respectively. Similarly, with Ag(I)halides they with the increase of proton number of the metal
form Mo(W)-Ag polymers [Me 4N][AgMoS 4] 3 and catalyst.
[Me 4N][AgWS 4] 4, respectively. Undergoing
polymeric chain breaking reactions with metal (I) 065 SALEH-E-IN, M.M. (Dept. of
cyanides, M'CN (M' = Cu, Ag), [Me 4N][CuMS 4] Chemistry, Govt. Bangla College, Dhaka);
form reported soluble cluster complexes, AHSHAN, M. (IGCRT, BCSIR, Dhaka) &
[Me 4N] 2[MS 4 (CuCN 2] (M = Mo, W). The same ROY, S.K. (Chemical Research Division, BCSIR
clusters are prepared from the reactions of Laboratories, Dhaka). CHEMICAL ANALYSIS
(Me 4N][AgMS 4] wiih CuCN. [Me 4N][AgMS 4] OF THE ELEMENTS PRESENT IN ANETHUM
form known clusters [Me 4N] 2[MS 4(AgCN)] with SOWA ROXB. EX. FLEM (DILL) SEED BY X-
AgCN. The complexes have been characterized on RAY FLUORESCENCE SPECTROMETRY. J.
the basis of elemental analysis, infrared, DTA and Bang. Acad. Sci. 2006, 30 (1), 111-116.
X-ray diffraction studies.
The qualitative and quantitative analyses of the
063 RAHMAN, M.M.; KHAN, M.M.R. & elements present in the seeds of Anethum sowa
HOSAIN, M.M. (Dept. of Chemistry, Shah Jalal (Dill) showed that the maximum amount of
University of Science & Technology, Sylhet). elements were (in g/100g) O (38.12), Ca (26.11),
Analysis of Vitamin C (ascorbic acid) Contents in K (17.3835), P (9.84), Mg (6.68), S (6.4302), Al
Various Fruits and Vegetables by UV- (0.72), Fe (0.65) and Na (0.36). Trace amount of
spectrophotometry. Bang. J. Sci. Ind. Res., 2007, Ti, Ni, Cu, Y, Zr and Ba were found in the
42 (4), 417-424. samples. However, Co, Pb, As and Hg could not be
detected in any of the samples.
Total vitamin C (ascorbic acid + dehydroascorbic
acid) has been determined by UV- 066 SATTAR, M.A.; CHAKRABORTY,
spectrophotometric method in various fruits and A.K.; AL-REZA, S.M. & ISLAM, M.S.
vegetables. In this method bromine water oxidizes (Dept. of Applied Chemistry and Chemical
ascorbic acid to dehydroascorbic acid in presence Technology, Islamic University, Kushtia).
of acetic acid. After coupling with 2,4- Extraction and Estimation of Furfural from
dinitrophenyl hydrazine at 37°C temperature for Decorative Plans Grown in Bangladesh. Bang. J.
three hours, the solution is treated with 85% H 2SO 4 Sci. Ind. Res., 2007, 42 (4), 495-498.
to produce a red color complex and the absorbance
was spectrophotometrically measured at 521 nm. An investigation on some decorative plants widely
The content of vitamin C were 10 mg/l00g to 80 grown in Bangladesh has been carried out. The
mg/l00g in fruits and 16 mg/l00g to 42 mg/l00g in plants Mimusops elengi, Madhuca indica, Hiptage
vegetables. A loss of 64% at-10°C and 76% at 5°C benghalensis and Polyalthia longifolia have been
was observed after two months storage period of analyzed for their furfural contents by colorimetric
one leafy vegetable "Enhydra fluctuans" (Helencha spectrophotometry after hydrolysis in 13 percent
shak). HC1 and extraction with 50 % ethanol. The results
revealed that the furfural concentration in these
064 SAHA, P.K. & BAHAR, M.H. (Dept. of plants is in the range of 3.9-10.3 percent,
Chemistry, Dhaka University, Dhaka). Metal indicating the potential of these plants as good
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