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All Journal Cakrawala Pendidikan Jurnal Ilmiah Peuradeun Jurnal Penelitian Pendidikan IPA (JPPIPA) Indonesian Journal of Chemistry Formatif: Jurnal Ilmiah Pendidikan MIPA Jurnal Pengabdian Masyarakat MIPA dan Pendidikan MIPA Psychology, Evaluation, and Technology in Educational Research Acta Chimica Asiana
Kristian Handoyo Sugiyarto
Department of Chemistry Education, Universitas Negeri Yogyakarta, Jl. Colombo No. 1, Yogyakarta 55281, Indonesia
Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Physics Social Sciences

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Pengembangan E-LKPD Berbasis Learning Cycle 7E dan Pengaruhnya Terhadap Pemahaman Konsep dan Keterampilan Proses Sains Peserta Didik Chaerunnisa Luvitasari Firdausi; Kristian Handoyo Sugiyarto; Yusup Maulana
Jurnal Penelitian Pendidikan IPA Vol 9 No 5 (2023): May
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i5.3690

Abstract

This study aims to develop e-SW or e-LKPD products, test the feasibility of e-SW 7E products based on expert assessments, test the practicality of e-SW 7E products based on the assessment of chemistry teachers and peer reviewers, find out the responses of students in terms of readability and test the effectiveness of e-SW 7E products. The method in this research is R&D with a 4-D development model. The sampling technique used in this study used cluster random sampling techniques. Interviews, questionnaires, and question techniques carry out data collection techniques. The data analysis technique used is the assessment of theoretical validity by qualitative experts converted quantitatively using the Likert scale with a score range of 1-5, empirical validity analyzed using the Quest program, and manova test analysis using SPSS. The results of the study found that e-SW 7E based on learning cycle 7E feasible, practical student responses in terms of readability in the very good category resulted in an average of all aspects of 4.45 and a percentage of 82.5%. There was an effects on the understanding of concepts and skills of the science process by 34.5%.
Synthesis, Characterization, and Magnetic Properties of Iron(II) Complex with 2,6-Bis(pyrazol-3-yl)pyridine Ligand and Tetracyanonickelate Anion Fitriani Fitriani; Irma Mulyani; Djulia Onggo; Kristian Handoyo Sugiyarto; Ashis Bhattacharjee; Hiroki Akutsu; Anas Santria
Indonesian Journal of Chemistry Vol 23, No 4 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.81625

Abstract

The complex containing iron(II), 2,6-bis(pyrazol-3-yl)pyridine (3-bpp) as ligand, and tetracyanonickelate as counter anion has been synthesized and characterized. The characterization data suggest the corresponding formula of [Fe(3-bpp)2][Ni(CN)4]·4H2O. Meanwhile, the SEM–EDX analysis image confirms the existence of all elements contained in the complex except the hydrogen atom. The infrared spectra exhibit vibration bands of the functional groups of 3-bpp ligand and [Ni(CN)4]−1 anion. From magnetic property measurement, the complex's molar magnetic susceptibility (XMT) value is 2.65 emu mol−1 K at 300 K, which contains about 75% high-spin state of the Fe(II) complex. Upon lowering the temperature, the XMT value gradually decreases around 1.37 emu mol−1 K at 13 K. It decreases sharply to about 0.73 emu mol−1 K at 2 K. These values reveal that Fe(II) complex is in the low-spin (LS) state. As a result, the complex exhibited spin-crossover characteristics of gradual transition without thermal hysteresis, and the transition temperature occurred below room temperature with a transition temperature (T1/2) close to 140 K. The spin crossover property of the complex is supported by a thermochromic reversible color change from red-brown at room temperature to dark brown on cooling in liquid nitrogen associated with the high-spin to low-spin transition.
Co-Authors Anas Santria Antuni Wiyarsi Ashis Bhattacharjee Cahyorini Kusumawardani Cahyorini Kusumawardani Chaerunnisa Luvitasari Firdausi Djulia Onggo Dwi Anggi Marini Dyah Purwaningsih Febrian Solikhin Fitriani Fitriani Hari Sutrisno Harold Andrew Goodwin Heru Pratomo Al Hiroki Akutsu Irma Mulyani Isana Supiah Yosephine Louise Isana Supiah Yosephine Louise Isti Yunita Jaslin Ikhsan Jaslin Ikhsan Jaslin Ikhsan Kristanti Eka Wulandari Naoko Kosaka Nira Listyawati Nur Fitriyana Septiana Indri Hapsari Shinta Setya Wilujeng Yusup Maulana