4-[(4-Methyl­phen­yl)amino]­pent-3-en-2-one

The title enamino­ketone, C12H15NO, is a derivative of 4-(phenyl­amino)­pent-3-en-2-one with an approximately planar pentenone backbone, the greatest displacement from the plane being 0.042 (1) Å; the asymmetry in C—C distances in the group suggests the presence of unsaturated bonds. The dihedral angle between the benzene ring and the pentenone plane is 29.90 (4)°. In the crystal, an intra­molecular N—H⋯O inter­action and an inter­molecular C—H⋯O hydrogen bond are observed

(2-Methyl-4-oxo-4H-pyran-3-olato-κ2 O 3,O 4)bis­(triphenyl­phosphane-κP)copper(I)–triphenyl­phosphane–methanol (1/1/1)

In the title compound, [Cu(C6H5O3)(C18H15P)2]·C18H15P·CH3OH, the pyran-4-one ring is appromimately planar (r.m.s deviation = 0.0138 Å), with the CuI atom 0.451 (5) Å out of the plane. The CuI atom has a distorted tetra­hedral coordination. The O—Cu—O angle is 80.07 (8)° and the P—Cu—P angle is 123.49 (3)°. The crystal packing is stablized by intra­molecular C—H⋯O inter­actions and inter­molecular C—H⋯O and O—H⋯O inter­actions

Bis[2-(methyl­amino)­troponato]copper(II)

In the title compound, [Cu(C8H8NO)2], a strictly square-planar geometry about the CuII metal atom is observed. Substitution of an O atom with a methyl-functionalized N atom does not significantly alter the bond distances and angles in the copper(II) complex when compared with a similar bis­(troponato)copper(II) complex. π–π stacking is observed between the tropolone rings, with inter­planar distances of 3.5039 (16) and 3.2933 (15) Å, respectively. Additional stabilisation of the structure is accomplished through C—H⋯O hydrogen-bonding interactions

Carbonyl[4-(2,6-dimethyl­phenyl­amino)pent-3-en-2-onato-κ2 N,O](triphenyl­phosphine-κP)rhodium(I) acetone hemi­solvate

In the title compound, [Rh(C13H16NO)(C18H15P)(CO)]·0.5C3H6O, the Rh atom exhibits a square-planar coordination geometry, being coordinated by the N and O atoms of the bidentate β-diketonato ligand, a P atom from the triphenyl­phosphine unit and a C atom from the carbonyl group. The asymmetric unit also contains a disordered half-mol­ecule, lying about an inversion center, of the acetone solvate. Inter­molecular C—H⋯O hydrogen bonds are observed between a C—H group of the triphenyl­phosphine unit and a carbonyl O atom and between the methyl group of the enamino­ketonato backbone and the solvent O atom. In addition, an intra­molecular inter­action is observed between a C—H group of the triphenyl­phosphine unit and the O atom of the enamino­ketonato ligand

Minimising electricity costs by developing an effective combination of alternative energy sources

This study evaluates the high electricity costs faced at a carpet manufacturing company. Research was conducted by focusing on the supply and availability of electricity in South Africa and alternative energy sources. Modelling methods were investigated to determine an appropriate approach to solving the high-cost problem at the company to ensure that the model could be reused for similar scenarios. The findings provide an electricity minimisation solution that requires the installation of a solar system. Using generated solar energy, and consuming generator power to maintain optimal monthly municipal thresholds, electricity costs would be reduced by over R100 000 monthly.Hierdie studie evalueer die hoë kostes van elektrisiteit by ʼn matvervaardigingsmaatskappy. Navorsing het gefokus op die verskaffing en beskikbaarheid van elektrisiteit in Suid-Afrika en alternatiewe energiebronne. Modelleringsmetodes is ondersoek om ʼn gepaste benadering te identifiseer om die hoë-koste probleem by die maatskappy op te los. Die bevindinge verskaf ʼn elektrisiteit minimering oplossing wat die installasie van ʼn sonpaneel stelsel vereis. Deur sonenergie op te wek, en deur dieselgenerator krag te gebruik om die optimale maandelikse munisipale drempels te handhaaf, kan maandelikse energiekostebesparings van meer as R100 000 gerealiseer word.http://sajie.journals.ac.za/pubam2021Industrial and Systems Engineerin

Perceived support for physical activity in the school environment

Physical activity for an individual is a strong means for prevention of diseases and for nations, a cost-effective method to improve public health across the population. A decline in physical activity of youth has however been noted in various world regions. Schools present unique opportunities to provide time, facilities and guidance for young people to participate in physical activity. The aim of this study is to determine the patterns of physical activity participation among high school girls and their perceived social support for physical activity in the school environment in Kigali, Rwanda. Three hundred and fifty (350) learners from six schools participated in the study. The mean age of the study sample was 16.06. The majority of learners did not meet the number of days required for moderate days of physical activity (66%) and for vigorous days of physical activity (70.9%). Overall the study sample responded negatively when asked about support for physical activity from Physical Education (PE) teachers, other teachers and boys at school. Teachers in general and PE teachers specifically thus need to be more aware of learners perceptions of their support for physical activity. It could be argued that if learners perceive teachers to be more supportive of physical activity, their participation in physical activity could increase. Continuous education including the benefits of and the required levels of physical activity is suggested for both PE and other teachers.DHE

Dicarbon­yl[4-(2,6-dimethyl­phenyl­amino)­pent-3-en-2-onato-κ2 N,O]rhodium(I)

In the title compound, [Rh(C13H16NO)(CO)2], a square-planar coordination geometry is observed around the RhI atom, formed by the N and O atoms of the bidentate ligand and two C atoms from two carbonyl ligands. The RhI atom is displaced from the plane through these surrounding atoms by 0.0085 (2) Å. The dihedral angle between the benzene ring and the N—C—C—C—O plane is 89.82 (6)°, and the N—Rh—O bite angle for the bidentate ligand is 90.53 (6)°. An inter­molecular C—H⋯O inter­action is observed between a methyl group of the benzene ring and a carbonyl O atom

Quantitative Computational Thermochemistry of Transition Metal Species

This article discusses quantitative computational thermochemistry of transition metal species. The correlation consistent Composite Approach (ccCA), which has been shown to achieve chemical accuracy (±1 kcal mol⁻¹) for a large benchmark set of main group and s-block metal compounds, is used to compute enthalpies of formation for a set of 17 3d transition metal species

The post-occipital spinal venous sinus of the Nile crocodile (Crocodylus niloticus) : its anatomy and use for blood sample collection and intravenous infusions

The post-occipital sinus of the spinal vein is often used for the collection of blood samples from crocodilians. Although this sampling method has been reported for several crocodilian species, the technique and associated anatomy has not been described in detail in any crocodilian, including the Nile crocodile (Crocodylus niloticus). The anatomy of the cranial neck region was investigated macroscopically, microscopically, radiographically and by means of computed tomography. Latex was injected into the spinal vein and spinal venous sinus of crocodiles to visualise the regional vasculature. The spinal vein ran within the vertebral canal, dorsal to and closely associated with the spinal cord and changed into a venous sinus cranially in the post-occipital region. For blood collection, the spinal venous sinus was accessed through the interarcuate space between the atlas and axis (C1 and C2) by inserting a needle angled just off the perpendicular in the midline through the craniodorsal cervical skin, just cranial to the cranial borders of the first cervical osteoderms. The most convenient method of blood collection was with a syringe and hypodermic needle. In addition, the suitability of the spinal venous sinus for intravenous injections and infusions in live crocodiles was evaluated. The internal diameter of the commercial human epidural catheters used during these investigations was relatively small, resulting in very slow infusion rates. Care should be taken not to puncture the spinal cord or to lacerate the blood vessel wall using this route for blood collection or intravenous infusions.The Norwegian Council for Higher Education’s Programme for Development, Research and Education (NUFU 08/02) and the Royal Netherlands Embassy in South Africa (Prof. Nico Visser).http://www.jsava.co.zaam2014ab201