Judul: Study of Photophysical Properties of Ir(III) Bolaamphiphilic Zwitterion Complex Using the Time-Dependent Density Functional Theory Method
Abstrak: Kompleks ion zwitter bolaamfifilik Ir(dfppy)2(pytz-s-SO3) atau IZB Ir, yang telah disintesis dalam penelitian sebelumnya, telah dikarakterisasi untuk memahami sifat fotofisiknya. Penelitian ini bertujuan mengkaji sifat fotofisik kompleks IZB Ir berdasarkan transisi elektronik secara komputasi, menggunakan metode time-dependent density functional theory (TD-DFT) dengan fungsional hibrida B3LYP dan basis set def2. Hasil optimasi geometri DFT menunjukan rentang panjang ikatan Ir-C dan Ir-N sebesar 2,010-2,016 Å dan 2,063-2,205 Å, dengan sudut C^N dan N^N masing-masing sebesar 80,5˚ dan 76,0˚. Posisi HOMO terletak pada Ir dan dfppy, sedangkan LUMO terpusat pada pytz. Transisi elektronik keadaan eksitasi didominasi oleh 1MLCT (dIr → π*pytz) dan 1LLCT (πdfppy → π*pytz) pada panjang gelombang 281,624 nm. Celah energi IZB Ir dalam fase non-polar dan polar masing-masing sebesar 3,800 dan 3,922 eV. Prediksi emisi IZB Ir didominasi transisi fluoresensi (S2 → S0) dan fosforesensi (T1 → S0) biru., The bolaamphiphilic zwitterion complex Ir(dfppy)2(pytz-s-SO3), referred to as IZB Ir and previously synthesized, has undergone characterization concerning its photophysical properties. This research is aimed at computationally examining the photophysical properties of the IZB Ir complex, focusing on electronic transitions, using the time-dependent density functional theory (TD-DFT) method with the B3LYP hybrid functional and the def2 basis set. The results of DFT geometry optimization obtained a range of Ir-C and Ir-N bond lengths are 2,010-2,016 Å and 2,063-2,205 Å, with C^N and N^N angles of 80,5˚ and 76,0˚, respectively. The HOMO position is located on Ir and dfppy, while LUMO is centered on pytz. The excited state electronic transition is primarily dominated by 1MLCT (dIr → π*pytz) dan 1LLCT (πdfppy → π*pytz) at a wavelength of 281.624 nm. The IZB Ir energy gap in the non-polar and polar phases is 3,800 and 3,922 eV, respectively. The anticipated emission from IZB Ir is primarily characterized by blue fluorescence (S2 → S0) and phosphorescence (T1 → S0) transitions.
Keyword: bolaamphiphilic, iridium(III), photophysics, TD-DFT, zwitterion

Judul: Sintesis dan Pencirian Senyawa 4-Dodekanadioilbis(1-fenil-3-metil-5-pirazolon) sebagai Ionofor untuk Penentuan Ion Lu3+ dengan Teknik Elektrode Selektif Ion
Abstrak: Ion selective electrode (ISE) as an alternative potentiometric method is used widely in determining Lu3+. The success of this method depends on the ionophor used on the ISE. The compound of 4-dodecanedioylbis(1-phenyl-3-methyl-5-pyrazolone) or H2DdBP as pyrazolone derivatives will be used as ionophor on ISE-Lu3+. H2DdBP had been successfully synthesized by Jensen’s method. This method involved reaction of 1-phenyl-3-methyl-5-pyrazolone and dodecanedioyl chloride in basic condition. A compound was produced as a solid substance and was purified by recrystallization using chloroform-ethanol. High performance liquid chromatogram showed that the compound was pure. The compound was in keto form with melting point range of 150-152ºC. Infrared spectra showed vibration peaks (cm-1) were 3451 (br, OH), 1624 (s, C=O), 1589 (s, phenyl C=C), 1558 (s, pyrazolone ring). Chemical shifts (Hz) for 1H-NMR were 7.81–7.84, 7.43–7.46, 7.26–7.290 (m, 10H, Ph); 2.72–2.75 (t, 4H, (CH2)2); 2.47 (s, 6H, CH3); 1.71–1.76 (m, 4H, (CH2)2); 1.32 (m, 12H, (CH2)6). All of these properties showed the characteristics of H2DdBP. Nernst factor of ISE-Lu3+ for two repetitions were 10.40 mV/decade and 8.60 mV/decade which showed that ISE-Lu3+ had good response in determining Lu3+.
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Judul: Populasi dan habitat yaki (macac nigra) di cagar alam gunung duasudara sulawesi utara
Abstrak: Kawasan Cagar Alam gunung Duasudara merupakan salah satu tempat ditemukannya yaki (Mocaca nigra), yang keberadaannya semakin terancam oleh aktivitas manusia. Data dasar mengenai status populasi yaki serta kondisi habitat sangat dibutuhkan guna menyelamatkan populasi dan habitat yaki di CA Gunung Duasudara.
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