Kamaliah Sirat - Academia.edu (original) (raw)
Papers by Kamaliah Sirat
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
... Nicotinic Acid during Cyclic Voltammetry Nurul Hudah bt Rahman, Tan Wee Tee * andKamaliah Sir... more ... Nicotinic Acid during Cyclic Voltammetry Nurul Hudah bt Rahman, Tan Wee Tee * andKamaliah Sirat 1 Department of Chemistry, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia * E-mail: wttan@science.upm.edu.my ...
Acta Crystallographica Section E Structure Reports Online, Dec 1, 2008
Keywords: dimethyIsuIpboxide complexes, vanadium(ill). ABSTRAK Garam kompleks dimetilsulf0ksida (... more Keywords: dimethyIsuIpboxide complexes, vanadium(ill). ABSTRAK Garam kompleks dimetilsulf0ksida (DMSO) dan vanadium(IlI)).angmempunyaiformula. empink VCI, 6DMSO dan VBr y 6Dl\1S0 leiah disinles1s dan dikaji. Kedudukan jaluY in!ra·merah dari regangan v(5=0) menunjukRan bahawa ligan adalah terkoordinat kepada. ion vanadium melalui oksigen. Keput"Usan dari spektra infra~merah jauk menu1/:uskan bahawa tiado ion halida yang terkoordinat kepada ion [agam. Spektra pantulan baur adalah hansisien dengan vanadium berada di sekitaran oklahderon. Berikutan dan iiu, garam klorida dan bromida diformulakan sebagai [V(DMSO),ICJ, dan [V[DMSOljBr, masing-masing. ABSTRACf Dimethylsulphaxide(DMSO! compkx salts ofvanadium(IIl) with theemfrincalformulae VCI,. 6DMSO and VBr,. 6DMSO were synthesized and investigated. The observed infra-red band positions ofthe v(S.O) stretch indicate that the ligand is coordinated to ·vanadium ion via oxygen. Far-infra-l-ed spectra lead to the conclusion that no-1U of...
Chinese Chemical Letters, 2015
ABSTRACT Type IV deep eutectic solvent (DES) involves the formation of metal-based eutectics from... more ABSTRACT Type IV deep eutectic solvent (DES) involves the formation of metal-based eutectics from metal salts or metal salt hydrate in combination with various hydrogen-bond donors (HBDs) such as urea, ethylene glycol or acetamide. In current study, two distinguished approaches were used to synthesize potential DESs, given as the direct heating and the evaporating methods. Successful synthesized DESs were subjected for physical properties characterization by Fourier Transform Infrared (FTIR) Spectroscopy, thermal stability, viscosity, and conductivity analyses. Five novel manganese (II)-based DESs were successfully synthesized as reported in this study. Data obtained indicated that the MnCl2•4H2O•acetamide DES exhibits the lowest freezing point (27.5 °C), highest thermal stability (193 °C point of dehydration), lowest viscosity (ŋ = 112.8 cP) and the highest conductivity (0.12723 mS cm−1). The findings obtained reveal the characteristics, nature or features of synthesised DESs as potential industrial solvents.
International Journal of Green Energy, 2014
The accuracy of the Content should not be relied upon and should be independently verified with p... more The accuracy of the Content should not be relied upon and should be independently verified with primary sources of information. Taylor and Francis shall not be liable for any losses, actions, claims, proceedings, demands, costs, expenses, damages, and other liabilities whatsoever or howsoever caused arising directly or indirectly in connection with, in relation to or arising out of the use of the Content.
Applied Catalysis A: General, 2013
Biodiesel production by simultaneous esterification and transesterification of waste oil with met... more Biodiesel production by simultaneous esterification and transesterification of waste oil with methanol has been studied in a heterogeneous system using solid ferric hydrogen sulphate [Fe (HSO4)3] acid catalyst. The catalyst was prepared by displacement reaction followed by calcination at 400 °C for 3 h. The prepared catalyst was characterized using X-ray diffraction (XRD), Fourier transform infrared spectrometer (FT-IR), Brunner-Emmett-Teller surface area measurement (BET), thermal gravimetric analyzer (TGA) and temperature-programmed desorption of NH3 (TPD-NH3). Furthermore, the dependence of the conversion of mixed waste oil on the reactions variables such as the molar ratio of methanol/oil, the amount of catalysts used, reaction temperatures, reusability were also investigated. The catalyst was reused many times with slight loss in activity and the maximum yield of 94.5% was achieved at the optimized conditions of reaction temperature of 205 °C; stirring speed of 350 rpm, 1:15 molar ratio of oil to alcohol and 1% w/w catalyst loading.
Molecules, 2014
Density, viscosity and ionic conductivity data sets of deep eutectic solvents (DESs) formed by te... more Density, viscosity and ionic conductivity data sets of deep eutectic solvents (DESs) formed by tetrabutylammonium bromide (TBABr) paired with ethlyene glycol, 1,3-propanediol, 1,5-pentanediol and glycerol hydrogen bond donors (HBDs) are reported. The properties of DES were measured at temperatures between 303 K and 333 K for HBD percentages of 66.7% to 90%. The effects of HBDs under different temperature and percentages are systematically analyzed. As expected, the measured density and viscosity of the studied DESs decreased with an increase in temperature, while ionic conductivity increases with temperature. In general, DESs made of TBABr and glycerol showed the highest density and viscosity and the lowest ionic conductivity when compared to other DESs. The presence of an extra hydroxyl group on glycerol in a DES affected the properties of the DES.
Due to increasing population growth, the consumption and needs of energy increase significantly. ... more Due to increasing population growth, the consumption and needs of energy increase significantly. This leads Indonesia government to search alternative energy to cover the lacks of fossil energy reserves. Biodiesel is one of the prospective alternative energy which are renewable and environmental friendly. A common problem in large-scale biodiesel production is the sustainability of feedstock and the biodiesel stability. Therefore, the purpose of this study was to evaluate the production of biodiesel from two oil sources i.e. waste cooking oil and castor oil. This study examined the effect of mixed oil ratio on yield, biodiesel characteristics and stability. The physical properties included kinematic viscosity, acid number, saponification number, iodine number and cetane number have been evaluated as function of oil ratio. Yield of biodiesel was obtained at 35.07%, 99.2% and 83.69% for jatropha:castor oil ratio of 1: 0, 1: 2 and 2: 1, respectively. Most of these characteristics showed an increase by increasing the oil ratio. The result concluded that at the ratio of 1:1(v/v) was the best characteristic and stability.
Acta Crystallographica Section E-structure Reports Online, 2008
Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.002 Å; R factor = 0.037; wR... more Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.002 Å; R factor = 0.037; wR factor = 0.092; data-to-parameter ratio = 16.4.
Acta Crystallographica Section E-structure Reports Online, 2009
Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.002 Å; disorder in main res... more Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.002 Å; disorder in main residue; R factor = 0.041; wR factor = 0.103; data-to-parameter ratio = 22.7.
Molecules, 2010
New series of hydrotalcite (HT)-like anionic clays containing Zr 4+ in the brucite-like layer hav... more New series of hydrotalcite (HT)-like anionic clays containing Zr 4+ in the brucite-like layer have been synthesised by a simple coprecipitation method at constant pH. The incorporation of Zr in the layer have been confirmed by various analytical methods such as powder X-ray diffraction (PXRD), chemical analysis, UV-Vis diffusereflectance (UV-Vis DR) spectra and thermogravimetric analysis. These Zr containing HT-like materials show very interesting properties as catalyst in the liquid phase hydroxylation of phenol to selectively catechol.
![Research paper thumbnail of Structure of trans-diaquabis(oxalato)vanadate(III) complexes: A[V(C2O4)2(H2O)2].xH2O, A = Cs (x = 4) and A = CH3NH3 (x = 4.5](https://attachments.academia-assets.com/49967884/thumbnails/1.jpg)
](Acta Crystallographica Section C-crystal Structure Communications, 1985
Journal of The Chemical Society-dalton Transactions, 1988
... vanadate(III) complex salts, A[V(ox) 2 (H 2 O) 2 ]??xH 2 O (A = Cs, K, or NH 3 Me), and the X... more ... vanadate(III) complex salts, A[V(ox) 2 (H 2 O) 2 ]??xH 2 O (A = Cs, K, or NH 3 Me), and the X-ray crystal structure of the potassium salt (x= 3). Robert Stranger, Kamaliah Sirat, Peter W. Smith, Ian E. Grey and Ian C. Madsen J. Chem. ...
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
... Nicotinic Acid during Cyclic Voltammetry Nurul Hudah bt Rahman, Tan Wee Tee * andKamaliah Sir... more ... Nicotinic Acid during Cyclic Voltammetry Nurul Hudah bt Rahman, Tan Wee Tee * andKamaliah Sirat 1 Department of Chemistry, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia * E-mail: wttan@science.upm.edu.my ...
Acta Crystallographica Section E Structure Reports Online, Dec 1, 2008
Keywords: dimethyIsuIpboxide complexes, vanadium(ill). ABSTRAK Garam kompleks dimetilsulf0ksida (... more Keywords: dimethyIsuIpboxide complexes, vanadium(ill). ABSTRAK Garam kompleks dimetilsulf0ksida (DMSO) dan vanadium(IlI)).angmempunyaiformula. empink VCI, 6DMSO dan VBr y 6Dl\1S0 leiah disinles1s dan dikaji. Kedudukan jaluY in!ra·merah dari regangan v(5=0) menunjukRan bahawa ligan adalah terkoordinat kepada. ion vanadium melalui oksigen. Keput"Usan dari spektra infra~merah jauk menu1/:uskan bahawa tiado ion halida yang terkoordinat kepada ion [agam. Spektra pantulan baur adalah hansisien dengan vanadium berada di sekitaran oklahderon. Berikutan dan iiu, garam klorida dan bromida diformulakan sebagai [V(DMSO),ICJ, dan [V[DMSOljBr, masing-masing. ABSTRACf Dimethylsulphaxide(DMSO! compkx salts ofvanadium(IIl) with theemfrincalformulae VCI,. 6DMSO and VBr,. 6DMSO were synthesized and investigated. The observed infra-red band positions ofthe v(S.O) stretch indicate that the ligand is coordinated to ·vanadium ion via oxygen. Far-infra-l-ed spectra lead to the conclusion that no-1U of...
Chinese Chemical Letters, 2015
ABSTRACT Type IV deep eutectic solvent (DES) involves the formation of metal-based eutectics from... more ABSTRACT Type IV deep eutectic solvent (DES) involves the formation of metal-based eutectics from metal salts or metal salt hydrate in combination with various hydrogen-bond donors (HBDs) such as urea, ethylene glycol or acetamide. In current study, two distinguished approaches were used to synthesize potential DESs, given as the direct heating and the evaporating methods. Successful synthesized DESs were subjected for physical properties characterization by Fourier Transform Infrared (FTIR) Spectroscopy, thermal stability, viscosity, and conductivity analyses. Five novel manganese (II)-based DESs were successfully synthesized as reported in this study. Data obtained indicated that the MnCl2•4H2O•acetamide DES exhibits the lowest freezing point (27.5 °C), highest thermal stability (193 °C point of dehydration), lowest viscosity (ŋ = 112.8 cP) and the highest conductivity (0.12723 mS cm−1). The findings obtained reveal the characteristics, nature or features of synthesised DESs as potential industrial solvents.
International Journal of Green Energy, 2014
The accuracy of the Content should not be relied upon and should be independently verified with p... more The accuracy of the Content should not be relied upon and should be independently verified with primary sources of information. Taylor and Francis shall not be liable for any losses, actions, claims, proceedings, demands, costs, expenses, damages, and other liabilities whatsoever or howsoever caused arising directly or indirectly in connection with, in relation to or arising out of the use of the Content.
Applied Catalysis A: General, 2013
Biodiesel production by simultaneous esterification and transesterification of waste oil with met... more Biodiesel production by simultaneous esterification and transesterification of waste oil with methanol has been studied in a heterogeneous system using solid ferric hydrogen sulphate [Fe (HSO4)3] acid catalyst. The catalyst was prepared by displacement reaction followed by calcination at 400 °C for 3 h. The prepared catalyst was characterized using X-ray diffraction (XRD), Fourier transform infrared spectrometer (FT-IR), Brunner-Emmett-Teller surface area measurement (BET), thermal gravimetric analyzer (TGA) and temperature-programmed desorption of NH3 (TPD-NH3). Furthermore, the dependence of the conversion of mixed waste oil on the reactions variables such as the molar ratio of methanol/oil, the amount of catalysts used, reaction temperatures, reusability were also investigated. The catalyst was reused many times with slight loss in activity and the maximum yield of 94.5% was achieved at the optimized conditions of reaction temperature of 205 °C; stirring speed of 350 rpm, 1:15 molar ratio of oil to alcohol and 1% w/w catalyst loading.
Molecules, 2014
Density, viscosity and ionic conductivity data sets of deep eutectic solvents (DESs) formed by te... more Density, viscosity and ionic conductivity data sets of deep eutectic solvents (DESs) formed by tetrabutylammonium bromide (TBABr) paired with ethlyene glycol, 1,3-propanediol, 1,5-pentanediol and glycerol hydrogen bond donors (HBDs) are reported. The properties of DES were measured at temperatures between 303 K and 333 K for HBD percentages of 66.7% to 90%. The effects of HBDs under different temperature and percentages are systematically analyzed. As expected, the measured density and viscosity of the studied DESs decreased with an increase in temperature, while ionic conductivity increases with temperature. In general, DESs made of TBABr and glycerol showed the highest density and viscosity and the lowest ionic conductivity when compared to other DESs. The presence of an extra hydroxyl group on glycerol in a DES affected the properties of the DES.
Due to increasing population growth, the consumption and needs of energy increase significantly. ... more Due to increasing population growth, the consumption and needs of energy increase significantly. This leads Indonesia government to search alternative energy to cover the lacks of fossil energy reserves. Biodiesel is one of the prospective alternative energy which are renewable and environmental friendly. A common problem in large-scale biodiesel production is the sustainability of feedstock and the biodiesel stability. Therefore, the purpose of this study was to evaluate the production of biodiesel from two oil sources i.e. waste cooking oil and castor oil. This study examined the effect of mixed oil ratio on yield, biodiesel characteristics and stability. The physical properties included kinematic viscosity, acid number, saponification number, iodine number and cetane number have been evaluated as function of oil ratio. Yield of biodiesel was obtained at 35.07%, 99.2% and 83.69% for jatropha:castor oil ratio of 1: 0, 1: 2 and 2: 1, respectively. Most of these characteristics showed an increase by increasing the oil ratio. The result concluded that at the ratio of 1:1(v/v) was the best characteristic and stability.
Acta Crystallographica Section E-structure Reports Online, 2008
Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.002 Å; R factor = 0.037; wR... more Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.002 Å; R factor = 0.037; wR factor = 0.092; data-to-parameter ratio = 16.4.
Acta Crystallographica Section E-structure Reports Online, 2009
Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.002 Å; disorder in main res... more Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.002 Å; disorder in main residue; R factor = 0.041; wR factor = 0.103; data-to-parameter ratio = 22.7.
Molecules, 2010
New series of hydrotalcite (HT)-like anionic clays containing Zr 4+ in the brucite-like layer hav... more New series of hydrotalcite (HT)-like anionic clays containing Zr 4+ in the brucite-like layer have been synthesised by a simple coprecipitation method at constant pH. The incorporation of Zr in the layer have been confirmed by various analytical methods such as powder X-ray diffraction (PXRD), chemical analysis, UV-Vis diffusereflectance (UV-Vis DR) spectra and thermogravimetric analysis. These Zr containing HT-like materials show very interesting properties as catalyst in the liquid phase hydroxylation of phenol to selectively catechol.
Acta Crystallographica Section C-crystal Structure Communications, 1985
Journal of The Chemical Society-dalton Transactions, 1988
... vanadate(III) complex salts, A[V(ox) 2 (H 2 O) 2 ]??xH 2 O (A = Cs, K, or NH 3 Me), and the X... more ... vanadate(III) complex salts, A[V(ox) 2 (H 2 O) 2 ]??xH 2 O (A = Cs, K, or NH 3 Me), and the X-ray crystal structure of the potassium salt (x= 3). Robert Stranger, Kamaliah Sirat, Peter W. Smith, Ian E. Grey and Ian C. Madsen J. Chem. ...