Investigation of the crystal structures of n-(4-fluorobenzoyl) benzenesulfonamide and n-(4-fluoro-benzoyl)-4-methylbenzenesulfonamide

The title compound, C26H26N2O7, is a thia­midine derivative. Geometric parameters are in the usual ranges. The crystal packing is stabilized by a classical N—H⋯O hydrogen bond, several weak C—H⋯O hydrogen bonds and a π–π stacking inter­action

Investigation of the crystal structures of n-(4-fluorobenzoyl) benzenesulfonamide and n-(4-fluoro-benzoyl)-4-methylbenzenesulfonamide

The crystal structures of two closely related compounds, namely, N-(4-fluorobenzoyl)-benzenesulfonamide (I) and N-(4-fluorobenzoyl)-4-methylbenzenesulfonamide (II) are investigated by analysing the packing patterns and intermolecular interactions, and also by Hirshfeld surface analysis. The crystal structure of each of (I) and (II) displays a two-dimensional architecture. Hirshfeld surfaces comprising d(norm) surface and 2D fingerprint plots were analysed for both molecules in order to understand the relationship between the crystal structures. The analysis shows that the lengths of the observed hydrogen bonds and other intermolecular interactions in (II) are relatively shorter than those observed in (I). Further, the analysis demonstrates the predominant participation of the sulfonyl-O atom and the carbonyl-O atom as the hydrogen bond acceptors in (I) and (II), respectively

Crystal structures of three N-aryl-2,2,2-tribromoacetamides

Three N-aryl-2,2,2-tribromoacetamides, namely, 2,2,2-tribromo-N-(2-fluorophenyl) acetamide, C8H5Br3FNO, (I), 2,2,2-tribromo-N-3-(trifluoromethyl)phenyl] acetamide, C9H5Br3F3NO, (II) and 2,2,2-tribromo-N-(4-fluorophenyl) acetamide, C8H5Br3FNO, (III) were synthesized and their crystal structures were analysed. In the crystal structure of (I), C-Br pi aryl interactions connect the molecules into dimers, which in turn are connected via Br Br contacts 3.6519 (12) A ], leading to the formation of a onedimensional ladder-type architecture. The crystal structure of (II) features chains linked by N-H O and C-H O hydrogen bonds. Two such chains are interlinked to form ribbons through Br Br 3.6589 (1) angstrom] and Br F 3.0290 (1) A ] interactions. C-Br pi aryl and C-F pi aryl interactions between the ribbons extend the supramolecular architecture of (II) from one dimension to two. In (III), the molecules are connected into R2 2 (8) dimers via pairs of CH F interactions and these dimers form ribbons through Br Br 3.5253 (1) angstrom] contacts. The ribbons are further interlinked into columns via C-Br O C contacts, forming a two-dimensional architecture

Crystal structures of N-(3-fluorobenzoyl)benzenesulfonamide and N-(3-fluorobenzoyl)-4-methylbenzenesulfonamide

The crystal structures of two N-(arylsulfonyl)arylamides, namely N-(3-fluorobenzoyl)benzenesulfonamide, C13H10FNO3S, (I), and N-(3-fluorobenzoyl)-4-methylbenzenesulfonamide, C14H12FNO3S, (II), are described and compared with related structures. The dihedral angle between the benzene rings is 82.73 (10)° in (I) compared to 72.60 (12)° in (II). In the crystal of (I), the molecules are linked by C—H...O and C—H...π interactions, resulting in a three-dimensional grid-like architecture, while C—H...O interactions lead to one-dimensional ribbons in (II). The crystals of both (I) and (II) feature strong but non-structure-directing N—H...O hydrogen bonds with R22(8) ring motifs. The structure of (I) also features π–π stacking interactions

Investigation of the crystal structures and hirshfeld surfaces of three closely related N-(2-fluorobenzoyl)-arylsulfonamides

The investigation of the crystal structures of three closely related sulfonamides, namely N-(2-fluorobenzoyl)-2-methylbenzenesulfonamide (I), N-(2-fluorobenzoyl)-4-methylbenzenesulfonamide (II) and N-(2-fluorobenzoyl)-2-chlorobenzenesulfonamide (III) by analysing intermolecular interactions and the packing patterns, and also by Hirshfeld surface analyses is presented. Compound (I) has a three-dimensional (3D) network, in which N–H···O and C–H···F chains build up two-dimensional (2D) arrays, which are extended into a 3D network through C–H···π interactions. In (II), alternating N–H···O and C–H···O rings form one-dimensional (1D) ribbons, which are interconnected by C–H···π interactions to build a 2D network. In (III), 2D sheets comprising N–H···O rings, C–H···π chains, Cl···F and F···F contacts are stacked by π···π interactions to form a 3D network. Hirshfeld surface analyses, comprising dnorm surfaces, curvedness and 2D fingerprint (FP) plots, for all three molecules were also conducted to verify the importance of the different intermolecular interactions

Exploring desiccation cracks in soils using a 2D profile laser device

The study of desiccation cracks in soils has been a subject of increasing attention in recent research. This paper presents the use of a 2D profile laser that is coupled with a motion controller (that allows scanning the overall surface of a drying soil) and electronic balance (to measure the water loss). The aim is to accurately track the three most relevant variables associated with the behavior 14 of soils during desiccation: volume change, water loss and evolving crack network’s morphology. The paper presents the methodology to obtain a digital model of the soil using the experimental setup described above. The main results of a natural soil subjected to drying are presented and discussed, including evolution of cracks aperture; evolution of cracks depth, surface contour levels (at different times); and evolution of volume change. It is shown that the proposed methodology provides very useful information for studying the behavior of soils subjected to desiccation