A research in point of analogy of chemistry textbooks Li̇se ki̇mya ders ki̇taplarinin analoji̇k açidan i̇ncelenmeṡi

In this study 4 ninth-grade books, 5 tenth-grade and 3 eleventh-grade chemistry textbooks, approved by the Ministry of Education to be used in high schools in 2005-2006 were analyzed in relation to analogy. In the course of the study, the frequency, type (illustrated, verbal) and model of analogies, which take place in every topic, were analyzed. In case of more than one model in the same book and topic, only one of them was taken as a sample. At the end of the analysis, it was determined that 84 analogies take place in 12 textbooks, of which 68 are illustrated and 16 are verbal. When contents of these 84 analogies were analyzed, it was observed that 15 different models were used. It was concluded that analogies are used without any remarks and that types of analogy per book are insufficient

Crystal Structure Of 2,3-Diaza-1,3-Diphenylpropene

The title compound crystallizes in monoclinic space group P2(1)/c. There are two molecules in the asymmetric unit. While one of these molecules is in a general position, the other is in disordered position. The angle between the directions of the molecules in the asymmetric unit is 87.5(1)degrees.WoSScopu

Comparative experimental and theoretical studies of N-(4-ethylbenzylidene)-N'-(2-carboxyphenyl) hydrazine novel Schiff base

WOS: 000336110500062PubMed: 24657931In this work, N-(4-Methylbenzylidene)-N'-(2-carboxyphenyl) hydrazine, C15H14N2O2, Schiff base molecule has been synthesized and characterized by elemental analyses, UV-Vis and IR spectroscopy and single crystal X-ray determination. The molecule of the title compound adopt an E configuration about the azomethine C=N double bond. The benzene and phenyl rings are planar and the dihedral angle between the planes is 7.2(2)degrees. The crystal structure is stabilized by intermolecular O-H...O and intramoleculer N-H. ...O hydrogen bonding interactions. X-ray diffraction analyses show that, N-(4-Methylbenzylidene)-N'-(2-carboxyphenyl) hydrazine Schiff base molecule crystallizes in the monoclinic system, P2(1)/c space group, a = 4.392(5) angstrom, b = 22.340(5) angstrom, c = 13.528(5) angstrom, beta = 92.882(5), V= 1325.7(16) angstrom(3), Z= 4. The conformational analysis of N-(4-Methylbenzylidene)-N'-(2-carboxyphenyl) hydrazine was performed by the density functional theory (DFT) B3LYP method using the 6-311++G(d,p) basis set. Also, theoretical values of FTIR and UV-Vis were performed by the same method. The calculated geometry parameters, IR and UV-Vis results were compared with experimental results

Synthesis, crystal structure, and spectroscopic studies of n-(4-bromobenzylidene)-n '-(2-pyridyl) hydrazine schiff base molecule

WOS: 000302297400018A new Schiff base complex N-(4-bromobenzylidene)-N'-(2-pyridyl) hydrazine, C12H10N3Br, has been synthesized and characterized by elemental analyses, mass, H-1 NMR, ultraviolet-visible (UV-VIS), and IR spectroscopy and single-crystal X-ray determination. The p-Br-benzene and pyridine rings are almost planar and the dihedral angle between the planes is 11.1(3)degrees. The crystal structure is stabilized by intermolecular N-H center dot center dot center dot N-Py hydrogen bonding interaction. X-ray diffraction analyses show that N-(4-bromobenzylidene)-N'-(2-pyridyl) hydrazine Schiff base molecule crystallizes in the monoclinic system, P2(1)/c space group, a = 5.611(5) angstrom, b = 19.566(5) angstrom, c = 10.715(5) angstrom, beta = 98.766(5)degrees, and V = 1162.60(12) angstrom(3)