P A College of Engineering

About: P A College of Engineering is a based out in . It is known for research contribution in the topics: Dihedral angle & Ring (chemistry). The organization has 298 authors who have published 594 publications receiving 4888 citations.

The crystal structures of three 3-methyl-1H-1,2,4-triazole-5-thio­nes, including a second polymorph of 4-[(E)-(5-bromo-2-hy­droxy­benzyl­idene)amino]-3-methyl-1H-1,2,4-triazole-5(4H)-thione and a redetermination of 4-amino-3-methyl-1H-1,2,4-triazole-5(4H)-thione

Abstract: The structures of three 3-methyl-1H-1,2,4-triazole-5-thione derivatives are reported. The structure of 4-amino-3-methyl-1H-1,2,4-triazole-5(4H)-thione, C3H6N4S, (I), has been redetermined with an improved model for the H atoms: the non-H atoms of (I) all lie on mirror planes in space group Pbcm, and the H atoms of the methyl group are disordered over two sets of reflection-related atomic sites having occupancy 0.5: two independent N—H⋯S hydrogen bonds link the mol­ecules of compound (I) into complex sheets. The non-H atoms in the mol­ecules of 4-[(E)-(3,4-di­meth­oxy­benzyl­idene)amino]-3-methyl-1H-1,2,4-tri­azol-5(4H)-thione, C12H14N4O2S, (II), despite lying in general positions are close to planar, with a dihedral angle between the two rings of 6.31 (10)°: the mol­ecules of compound (II) are linked by a three-centre N—H⋯(O)2 hydrogen bond into a C(10)C(11)[R12(5)] chain of rings. A second polymorph of 4-[(E)-(5-bromo-2-hy­droxy-5-bromo­benzyl­idene)amino]-3-methyl-1H-1,2,4-triazole-5(4H)-thione, C10H9BrN4OS, (III), has been identified; the non-H atoms are nearly co-planar with a dihedral angle between the two rings of 1.9 (4)°. There is an intra­molecular O—H⋯N hydrogen bond and the mol­ecules are linked by N—H⋯S hydrogen bonds, forming centrosymmetric R22(8) dimers. Comparisons are made with some related structures.

Design and Analysis of Asymmetrical Spur Gear Drive for Automobile Gear Box Application

Abstract: This work mainly aims to explore the actual load, fillet and contact stresses induced during a mesh cycle in a spur gear tooth. As the mesh stiffness differs at different contact points along the path of contact, it significantly affects the load sharing between the simultaneously meshed contact pairs hence stresses. Comparative study has been made between existing symmetric spur gear pair used in light motor vehicle gear box and asymmetric spur gear. Finite element multi pair contact model has been used to explore the load sharing behavior and related stresses in this work.

1-(4-Methylphenyl)-5-phenylpenta-2,4dien-1-one

Abstract: The title compound, C18H16O, features two conjugate double bonds, both in E conformations. The molecule is essentially planar: the dihedral angle between the two phenyl groups is 9.4 ( 1)degrees.

N′-Isopropylidene-6-methoxy-2-naphthohydrazide

Abstract: The geometric parameters of the title compound, C15H16N2O2, are in the usual ranges. The mol­ecule is almost planar; only the torsion angles about the N—N bond [164.11 (15)°] and the C—C bond between the naphthyl and the amide group [C—C—C—O = − 157.24 (15)°] differ significantly from 0 or 180°. The crystal packing is characterized by chains of mol­ecules connected by N—H⋯O hydrogen bonds running along the c axis.

1-(2-Bromo-5-methoxyphenyl)-8-chloro-6-(2-fluorophenyl)4H-1,2,4-triazolo[4,3-a][1,4] benzodiazepine

Abstract: The title compound, C23H15BrClFN4O, is an analogue of sedatives such as midazolam and alprazolam. Its geometrical parameters are normal and comparable with those of related compounds. The only possible significant inter­molecular inter­action is a C—H⋯O bond.