Crystal structure and Hirshfeld surface analysis of ethyl 2-(7-chloro-3-methyl-2-oxo-1,2-di-hydro-quinoxalin-1-yl)acetate.

The quinoxaline moiety in the title mol-ecule, CHClNO, is almost planar (r.m.s.

The Potency of Invisalign® in Class II Malocclusion in Adults: A Narrative Review.

In recent years, a greater number of adult patients are seeking orthodontic treatment, not only for esthetics but for better functioning and hygiene purposes. However, they are more focused on comfortable and invisible treatment alternatives to conventional metal brackets. This abstract is a multifaceted interplay between Invisalign and different treatments of class II malocclusion, which embarks on the potency of Invisalign in treating this condition in adult patients.

Caffeine intake and its association with nutrition, sleep, and physical activity among schoolchildren in the United Arab Emirates: a national cross-sectional study.

Purpose: Recent surveys indicate a significant increase in total caffeine intake among schoolchildren. Limited research has been published concerning the total intake of caffeine among schoolchildren in the Middle East and Gulf Cooperation Council (GCC) countries, including the UAE.

Methods: This cross-sectional survey estimated the total caffeine intake from foods and beverages among 10,275 schoolchildren in the UAE.

Caffeinated energy drink consumption among Emirati adolescents is associated with a cluster of poor physical and mental health, and unhealthy dietary and lifestyle behaviors: a cross-sectional study.

Background: Consumption of caffeinated energy drinks (CED) has escalated during the last few years, especially among schoolchildren, with evident adverse health sequelae in this critical age group.

Objective: This study examined the prevalence of CED consumption and its associations with sleep, physical and mental health, and dietary and lifestyle habits among schoolchildren in the United Arab Emirates (UAE).

Method: A structured self-administered online questionnaire was developed and disseminated among schoolchildren aged 14-18 years, selected from schools of the seven emirates of the UAE.

Crystal structure and Hirshfeld surface analysis of 2,4,6-tri-amino-pyrimidine-1,3-diium dinitrate.

The title compound, CHN ·2NO , crystallizes in the monoclinic crystal system, space group 2/. The asymmetric unit, which comprises a diprotonated tri-amino-pyrimidine dication and two nitrate anions, has an almost planar geometry with a dihedral angle of 0.92 (4)° between the mean plane of the cation and that defined by both anions.

Crystal structure of ()-3-({6-[2-(4-chloro-phen-yl)ethen-yl]-3-oxo-2,3-di-hydro-pyridazin-4-yl}meth-yl)pyridin-1-ium chloride dihydrate.

In the title compound, CHClNO·Cl·2HO, three intra-mol-ecular hydrogen bonds are observed, N-H⋯O, O-H⋯Cl and O-H⋯O. In the crystal, mol-ecules are connected by C-H⋯Cl and N-H⋯O hydrogen bonds. Strong C-H⋯Cl, N-H⋯O, O-H⋯Cl and O-H⋯O hydrogen-bonding inter-actions are implied by the Hirshfeld surface analysis, which indicate that H⋯H contacts make the largest contribution to the overall crystal packing at 33.

Crystal structure and Hirshfeld surface analysis of dimethyl 3,3'-{[(1,2)-ethane-1,2-diyl-idene]bis(aza-nylyl-idene)}bis-(4-methyl-benzoate).

The title Schiff base compound, CHNO, synthesized by the condensation reaction of methyl 3-amino-4-methyl-benzoat and glyoxal in ethanol, crystallizes in the the monoclinic space group 2/. The mol-ecule is Z-shaped with the C-N-C-C torsion angle being 47.58 (18)°.

Crystal structure and Hirshfeld surface analysis of ()-4-{[4-(3-methyl-3-phenyl-cyclo-but-yl)thia-zol-2-yl]amino}-4-oxobut-2-enoic acid.

The title cyclo-butyl compound, CHNOS, was synthesized by the inter-action of 4-(3-methyl-3-phenyl-cyclo-but-yl)thia-zol-2-amine and maleic anhydride, and crystallizes in the ortho-rhom-bic space group 222 with ' = 1. The mol-ecular geometry is partially stabilized by an intra-molecular N-H⋯O hydrogen bond forming an (7) ring motif. The mol-ecule is non-planar with a dihedral angle of 88.

Crystal structure and mol-ecular docking study of diethyl 2,2'-({[(1,1')-(hydrazine-1,2-diyl-idene)bis-(methanylyl-idene)]bis-(4,1-phenyl-ene)}bis-(-oxy))di-acetate.

The title Schiff base, CHNO, adopts an configuration. The mol-ecule is planar, the mean planes of the phenyl ring system (r.m.

Crystal structure and Hirshfeld surface analysis of 6,6'-((1,1')-{[1,4-phenyl-enebis(methyl-ene)]bis(aza-nylyl-idene)}bis-(methane-ylyl-idene))bis-(2-meth-oxy-phenol).

The Schiff base compound, CHNO, was synthesized by the inter-action of 2-hy-droxy-3-meth-oxy benzaldehyde and 1,4-benzene dimethanamine in ethanol, and crystallizes in the monoclinic space group 2/ with ' = 0.5. The mol-ecule is not planar, the 1,4-di-ethyl-benzene and the phenol rings are twisted with respect to each other, making a dihedral angle of 74.

Crystal structure and Hirshfeld surface analysis of 3-(hy-droxy-meth-yl)-3-methyl-2,6-di-phenyl-piperidin-4-one.

A new synthesis of the title compound, CHNO, was developed with good yield and purity using the reaction of 4-hy-droxy-3-methyl-2-butanone, benzaldehyde and ammonium acetate in glacial acetic acid as a solvent. The central piperidine ring adopts a chair conformation, and its least-squares basal plane forms dihedral angles of 85.71 (11) and 77.

Crystal structure and Hirshfeld surface analysis of 2-{[()-(3-cyclo-butyl-1-1,2,4-triazol-5-yl)imino]-meth-yl}phenol.

The title compound, CHNO, was developed using the reaction of salicyl-aldehyde and 3-amino-5-cyclo-butyl-1,2,4-triazole in ethanol under microwave irradiation. This eco-friendly microwave-promoted method proved to be efficient in the synthesis of 2-{[()-(3-cyclo-butyl-1-1,2,4-triazol-5-yl)imino]-meth-yl}phenol in good yields and purity. The title compound is a Schiff base that exists in the phenol-imine tautomeric form and adopts an configuration.

Crystal structure and Hirshfeld surface analysis of bis-[(eth-oxy-methane-thio-yl)sulfanido](,,','-tetra-methyl-ethane-1,2-di-amine)-mercury(II).

The title four-coordinate mononuclear complex, [Hg(CHOS)(CHN)] or [Hg(CHOS)(tmeda)] (tmeda: ,,','-tetra-methyl-ethane-1,2-di-amine), has a distorted tetra-hedral geometry. The Hg ion is coordinated to two N atoms of the ,,','-tetra-methyl-ethylenedi-amine ligand and two S atoms from two ethylxanthate xanthate ligands. In the crystal, mol-ecules are linked by weak C-H⋯S hydrogen bonds, forming a two-dimensional supra-molecular architecture in the plane.

Crystal structure and Hirshfeld surface analysis of ()-2-{[(2,4-di-methyl-phen-yl)imino]-meth-yl}-4-methyl-phenol.

The title compound, CHNO, is a Schiff base that exists in the enol-imine tautomeric form and adopts a configuration. The mol-ecule is non-planar, with the twisted rings making a dihedral angle of 39.92 (4)°.

Crystal structure and Hirshfeld surface analysis of a copper(II) complex containing 2-nitro-benzoate and tetra-methyl-ethylenedi-amine ligands.

The reaction of copper(II) sulfatepentahydrate with 2-nitro-benzoic acid and ,,','-tetra-methyl-ethylenedi-amine (TMEDA) in basic solution produces the complex bis-(2-nitro-benzoato-κ)(,,','-tetra-methyl-ethylenedi-amine-κ ,')copper(II), [Cu(CHNO)(CHN)] or [Cu(2-nitro-benzoate)(tmeda)]. Each carboxyl-ate group of the 2-nitro-benzoate ligand is coordinated by Cu atom in a monodentate fashion and two TMEDA ligand nitro-gen atoms are coordinate by the metal center, giving rise to a distorted square-planar coordination environment. In the crystal, metal complexes are linked by centrosymmetric C-H⋯O hydrogen bonds, forming ribbons a (10) ring motif.

Indirect Health Effects of COVID-19: Unhealthy Lifestyle Behaviors during the Lockdown in the United Arab Emirates.

: Lockdown measures were implemented in many countries to limit the spread of the COVID-19 pandemic. However, such restrictions could precipitate unintended negative consequences on lifestyle behaviors. The main objective of this study was to investigate the prevalence and determinants of unhealthy behavior changes during the COVID-19 lockdown among residents of the United Arab Emirates (UAE).

Crystal structure and Hirshfeld surface analysis of 2-methyl-3-nitro--[()-(5-nitro-thio-phen-2-yl)methyl-idene]aniline.

The title compound, CHNOS, synthesized by condensation of 5-nitro-thio-phene-2-carbaldehyde and 2-methyl-3-nitro-aniline, crystallizes in the ortho-rhom-bic space group 222. In the mol-ecule, the aromatic benzene and thio-phene rings are twisted with respect to each other, making a dihedral angle of 23.16 (7)°.

Crystal structure and Hirshfeld surface analysis of ()-2-{[(2-iodo-phen-yl)imino]-meth-yl}-6-methyl-phenol.

The title compound, CHINO, was synthesized by condensation of 2-hy-droxy-3-methyl-benzaldehyde and 2-iodo-aniline, and crystallizes in the ortho-rhom-bic space group 222. The 2-iodo-phenyl and benzene rings are twisted with respect to each other, making a dihedral angle of 31.38 (2)°.

Synthesis, crystal structure and Hirshfeld surface analysis of 1,7-dimethyl-5a,6,11a,12-tetra-hydro-benzo[]benzo[5,6][1,4]oxazino[2,3-][1,4]oxazine.

Mol-ecules of the title compound, CHNO, occupy special positions on the twofold rotation axes. The heterocyclic ring adopts a slightly twisted envelope conformation with one of the two junction carbon atoms as the flap. The mean planes through the two halves of the mol-ecule form a dihedral angle of 72.

Synthesis, crystal structures and Hirshfeld surface analysis of 1,4-dibenzyl-6-methyl-1,4-di-hydro-quinoxaline-2,3-dione.

The title quinoxaline mol-ecule, CHNO, is not planar, the dihedral angle angle between the mean planes of the benzene rings being 72.54 (15)°. In the crystal, mol-ecules are connected into chains extending parallel to (10) by weak C-H⋯O hydrogen bonds.

Periodontal health knowledge and awareness among subjects with fixed orthodontic appliance.

Objective: To report on periodontal health knowledge and awareness among orthodontic patients and to investigate the effect of age, attitude and duration of orthodontic treatment on periodontal health awareness among orthodontic patients.

Methods: A total of 297 orthodontics patient (90 males, 207 females) with mean age of 17.7 ± 5.