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Synthesis of Magnesium Dicarboxylate Complex Yunita, Isti; Somsook, Ekasith
Indonesian Journal of Chemical Science Vol 9 No 2 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v9i2.39353

The synthesis of magnesium dicarboxylate complex were completed and the coordination chemistry of magnesium dicarboxylate was investigated in the different pH under hydrothermal or solvothermal processes. It was proven that the synthesis conditions affected the shape of the compound due to the nucleation process, but had no effect on the functional groups of the synthesized compounds. Complex compound was characterized by Nuclear Magnetic Resonance (NMR), Electrospray ionization (ESI-MS), and Fourier transform-infrared spectroscopy (FT-IR).

Synthesis of Magnesium Dicarboxylate Complex Yunita, Isti; Somsook, Ekasith
Indonesian Journal of Chemical Science Vol 9 No 2 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v9i2.39353

The synthesis of magnesium dicarboxylate complex were completed and the coordination chemistry of magnesium dicarboxylate was investigated in the different pH under hydrothermal or solvothermal processes. It was proven that the synthesis conditions affected the shape of the compound due to the nucleation process, but had no effect on the functional groups of the synthesized compounds. Complex compound was characterized by Nuclear Magnetic Resonance (NMR), Electrospray ionization (ESI-MS), and Fourier transform-infrared spectroscopy (FT-IR).

Preparation, Electronic Properties, and Powder-XRD Structure Analysis of 3,5-Bis(pyridin-2-yl)-H-1,2,4-triazoledichloridocopper(II) Kristian Handoyo Sugiyarto; Isti Yunita; Harold Andrew Goodwin
Indonesian Journal of Chemistry Vol 20, No 6 (2020)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.55600

Salt of [Cu(bptrzH)Cl2], (bptrzH = 3,5-bis(pyridin-2-yl)-H-1,2,4-triazole) has been prepared and characterized its electronic spectral and magnetic properties. This salt is paramagnetic with magnetic moment, μs, being 1.77–1.78 BM at 293 K, but decreased significantly with decreasing temperature to be 0.60–0.63 BM at 90 K, indicating antiferromagnetic nature. This is associated with Cu–Cu magnetic interactions at low temperatures, and suggests that the salt adopt an octahedrally polymeric structure. The electronic spectrum of this salt reveals a strong ligand field band centered at about 13,000 cm–1 and a very strong charge transfer absorption at about 23,000–24,000 cm–1. The spectrum is better resolved at lower temperature and this is parallel to the slight change in color from yellowish-green at room temperature to bright green at low temperature (90 K). The powder XRD of this complex was refined by Le Bail method of Rietica program and found to be fit as triclinic symmetry of space group PĪ with the figure of merit: Rp = 5.02; Rwp = 7.95; Rexp = 5.40; Bragg R-Factor = 0.05; and GOF = 2.166.

Synthesis of Natural Zeolite/ZnO and its photodegradation activity on congo red M. Pranjoto Utomo; A. K. Prodjosantoso; Kun Sri Budiasih; Isti Yunita; Tisia Miftakhul Triani; Vera Dwi Nur Rahmawati
Indonesian Journal of Chemistry and Environment Vol 6, No 2 (2023): DECEMBER 2023
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijoce.v6i2.68334

Dyes are the most common compound used in the textile industry. Dyes consisted of azo compound that is difficult to be degraded. Undegradated azo compound, such as congo red, danger for the environment. An alternative effort to handle congo red waste must be conducted. Natural zeolite/ZnO is a material that can be used to degrade congo red to be simpler compound. Based on the analysis, the characters of natural zeolite/ZnO are hexagonal wurtzite structure, particle size 24.264 nm, band gap energy 2.96 eV. The highest degradation percentage in photodegradation activity of natural zeolite/ZnO on congo red is 99.41%.

Silica Modified Natural Dye of Caesalpinnia sappan l. on Cotton Fabrics Kun Sri Budiasih; Eli Rohaeti; Isti Yunita; Azlan Kamari
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol 10, No 1 (2023): al Kimiya: Jurnal Ilmu Kimia dan Terapan
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v10i1.24578

Sappana (Caesalpinnia sappan L.) has been known as a natural dye in textiles and food. This research aimed to develop a sappan-based natural dye for fabrics dyeing by SiO2 modification as the UV protection agent. The sappan dye and its color were measured by colorimetric methods on UV-Vis spectrophotometry. The testing of the material includes a standard color detection test on the solution and washing resistance on cotton fabrics. The product is the prototype of a stable natural dye product of SiO2 modified - sappan (Si-Cs) which will be performed consistently on cotton fabrics. The result showed that SiO2-modified sappan dye had a higher absorbance in UV-Vis Spectrometer. The performance of the coloring product was also better than the standard sappan dye, indicated by the higher Ultraviolet Protection Factor and the fastness value. Variations of coloring products affected by the mordant agents varied from orange-red-purple caused by non-mordant–alum acetate and iron mordant respectively.

Pengenalan Persepsi Dasar Kimia pada Anak melalui Eksperimen Sains Menarik sebagai Upaya Penanggulangan Chemophobia Isti Yunita; Dina Dina; Kun Sri Budiasih; Cahyorini Kusumawardani
Jumat Pendidikan: Jurnal Pengabdian Masyarakat Vol. 5 No. 2 (2024): Agustus
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat UNWAHA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32764/abdimaspen.v5i2.4173

Pengabdian kali ini bertujuan untuk mengenalkan persepsi dasar kimia pada anak melalui eksperimen sains menarik untuk menanggulangi chemophobia. Sejumlah 30 peserta kegiatan dari MDT. Ngudi Luhur menjadi khalayak sasaran. Kegiatan disampaikan dalam dua kali pertemuan, teori dan praktik. Eksperimen kimia menarik dipilih sebagai kegiatan untuk memperkuat teori yang telah disampaikan di pertemuan sebelumnya. Eksperimen kimia menarik yang dilakukan yaitu ikan berenang, pelangi di piring, the menjadi air putih, meniup balon, lava lamp, dan pesan rahasia. Instrumen yang digunakan yaitu lembar need assessment, lembar observasi keaktifan peserta, lembar observasi unjuk kerja, kumpulan pertanyaan untuk game cerdas cermat, serta lembar angket evaluasi kegiatan. Kegiatan mencapai indikator keberhasilan ditandai dengan 81,67% peserta terlibat aktif serta 100% peserta mengikuti demonstrasi dengan baik. Keberhasilan kegiatan pengabdian menjadi salah satu kontribusi tim pengabdi dalam mengatasi kesalahan persepsi terhadap kimia yang berkembang di masyarakat yang akan lebih dirasakan manfaatnya jika diberikan sejak usia anak.

Photodegradation of rhodamine B over natural zeolite/ZnO Utomo, M. Pranjoto; Prodjosantoso, Anti Kolonial; Budiasih, Kun Sri; Yunita, Isti; Triani, Tisia Miftakhul; Rahmawati, Vera Dwi Nur
Indonesian Journal of Chemistry and Environment Vol. 7 No. 1 (2024): JUNE 2024
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijoce.v7i1.74067

Rhodamine B is dye compound commonly used in the textile industry that consisted of azo compound. Azo compound generally difficult to be degraded. Undegradated azo compound in rhodamine B make it danger for the environment. An effective effort to handle rhodamine B waste must be conducted. Natural zeolite/ZnO is a material that can be used to degrade rhodamine B to be simpler compound based on photodegradation procces. Based on the analysis, the particle size of natural zeolite/ZnO is 16.92709 nm and the band gap energy 2.92 eV. The highest degradation percentage of rhodamine B over natural zeolite/ZnO under UV irradiation is 99.54%.

DESAIN MULTIMEDIA E-TAB BERORIENTASI LITERASI KIMIA PADA MATERI TITRASI ASAM BASA Hasanah, Nurlaila Umi; Yunita, Isti
Jurnal Riset Pembelajaran Kimia Vol 10, No 2 (2025): Jurnal Riset Pembelajaran Kimia
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jrpk.v10i2.23541

Penelitian ini bertujuan untuk menentukan karakteristik, kelayakan, dan respon peserta didik terhadap multimedia Electronic Titration of Acid Base (E-TAB) yang berorientasi pada literasi kimia sebagai sumber belajar mandiri pada materi titrasi asam-basa. Penelitian menggunakan metode Design-Based Research (DBR) model exploratory sequential di beberapa SMA di Kabupaten Bantul. Subjek uji coba terdiri dari lima guru kimia dan 28 peserta didik kelas XII. Instrumen yang digunakan meliputi angket analisis kebutuhan, angket kedapatgunaan, dan angket keterbacaan. Data dianalisis secara deskriptif kualitatif dan kuantitatif menggunakan skala Likert.Hasil penelitian menunjukkan bahwa multimedia E-TAB memiliki karakteristik berupa ringkasan materi, video animasi simulasi praktikum, LKPD, MSDS, dan kuis, serta dapat diakses tanpa internet melalui Google Drive. Persentase keidealan dari uji guru dan peserta didik masing-masing sebesar 96,69% dan 86,62% dengan kategori Sangat Baik. Multimedia E-TAB dinyatakan layak dan dapat digunakan sebagai sumber belajar mandiri setelah penyesuaian berdasarkan masukan guru. Kata Kunci: Multimedia, Titrasi Asam dan Basa, Sumber Belajar, Orientasi Literasi Kimia.Abstract. This study aims to determine the characteristics, feasibility, and student responses to the Electronic Titration of Acid Base (E-TAB) multimedia, which is oriented toward chemical literacy as an independent learning resource for high school students on acid-base titration material. The research employed a Design-Based Research (DBR) method with an exploratory sequential model, conducted in several senior high schools in Bantul Regency. The trial subjects included five chemistry teachers and 28 twelfth-grade students. The research instruments consisted of student needs analysis questionnaires, teacher usability questionnaires, and student readability questionnaires. Data were analyzed using qualitative descriptive methods and converted to quantitative data using a Likert scale.The results show that E-TAB multimedia features include material summaries, animated simulation videos, student worksheets (LKPD), Material Safety Data Sheets (MSDS), and quizzes. It is accessible offline via a free Google Drive link. Usability and readability tests showed ideal percentages of 96.69% and 86.62%, respectively, both categorized as Excellent. E-TAB multimedia was declared feasible for use after incorporating feedback from chemistry teachers and is considered suitable as a self-learning tool for students.

Peningkatan Profesionalisme Komite Pembelajaran Sekolah Penggerak melalui Pelatihan Pengembangan Sumber Belajar Berbasis Visualisasi Augmented Reality (AR) Dina, Dina; Yunita, Isti; Ikhsan, Jaslin; Kusumawardani, Cahyorini; Budiasih, Kun Sri
Jurnal Pengabdian Masyarakat MIPA dan Pendidikan MIPA Vol. 8 No. 1 (2024): Vol 8, No 1 (2024)
Publisher : Yogyakarta State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jpmmp.v8i1.67536

Kegiatan pengabdian ini bertujuan untuk meningkatkan profesionalisme komite pembelajaran sekolah penggerak melalui pelatihan sumber belajar berbasis visualisasi AR. Sejumlah 35 komite pembelajaran pada sekolah dasar di Gunung Kidul menjadi khalayak sasaran pada kegiatan ini. Pengabdian dikemas berupa pelatihan yang dilaksanakan dengan beberapa metode pelaksanaan, yaitu ceramah dan latihan, penugasan dan pendampingan, serta tes dan angket dan terbagi dalam tiga kali pertemuan. Teknologi yang dilatihkan yaitu Canva dan Assemblr Studio yang memungkinkan guru untuk membuat sumber belajar yang interaktif dengan menyematan objek 3D. Instrumen yang digunakan berupa soal pretes dan postes, lembar observasi afektif, lembar observasi psikomotorik, lembar penilaian produk, dan angket evaluasi. Hasil analisis data menunjukkan bahwa persentase observasi kognitif sebesar 85%, observasi psikomotor sebesar 80,36%, dan penilaian produk sebesar 93, 21%. Hasil pretes menunjukkan skor rata-rata peserta sebesar 54,71 mengalami peningkatan yang signifikan setelah diberikan pelatihan menjadi sebesar 83,94 pada skor rata-rata postes. Dapat disimpulkan bahwa kegatan pengabdian mencapai indikator keberhasilan yang ditetapkan. Secara umum, peserta merasa bahwa kegiatan yang dilakukan memberikan manfaat tidak hanya pada peningkatan pengetahuan (theoritical knowledge), melainkan juga keterampilan (practical how to) terkait pengembangan sumber belajar dalam rangka implementasi Kurikulum Merdeka.

Pemanfaatan Ekstrak Daun Ketapang (Terminalia catappa L) sebagai Antibakteri dan Antiembun pada Cairan Pembersih Lensa Kacamata Na'im, Wihdatun; Rahmat, Taufiq Bayu Nur; Saragih, Januardo Fernandez; Yunita, Isti
Jurnal Pengabdian Masyarakat MIPA dan Pendidikan MIPA Vol. 8 No. 1 (2024): Vol 8, No 1 (2024)
Publisher : Yogyakarta State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jpmmp.v8i1.69919

Penggunaan kacamata secara terus-menerus dan kurang steril dapat menyebabkan kacamata terkontaminasi bakteri yang dapat menimbulkan berbagai macam penyakit. Selain itu, permasalahan berupa embun pada kacamata juga dapat membahayakan pengguna kacamata ketika berkendara. Daun ketapang diketahui memiliki kandungan antibakteri dan isopropanol diketahui dapat memberikan efek antiembun. Tujuan dari penelitian ini adalah mengetahui efektivitas ekstrak dan konsentrasi optimal daun ketapang (Terminalia Catappa L.) sebagai aktivitas antibakteri dan antiembun pada cairan pembersih lensa kacamata. Penelitian ini menggunakan metode eksperimental yang terdiri dari 7 perlakuan dengan 3 kali pengulangan. Perlakuan yang diuji adalah ekstrak metanol kulit batang kasturi 12,5%, 25%, 50%, 75%, dan 100%, dan kontrol perlakuan dengan Aquades dan Ciprofloxacin. Uji bakteri dilakukan menggunakan metode difusi dan parameter yang diukur adalah besaran zona hambat (mm) yang tumbuh pada media MH. Hasil penelitian menunjukkan bahwa konsentrasi ekstrak daun ketapang yang optimal digunakan dalam pembuatan cairan pembersih lensa yaitu sebesar 75% dengan nilai efektivitas yang paling tinggi yaitu sebesar 12,34%.

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