(IUCr) AfCA collection

When a dream comes true: birth of the African Crystallographic Association (AfCA)

This paper summarizes brief perspectives on the historic process of establishing an African Crystallographic Association (AfCA), including appropriate role players, organizations and accompanying events. It concludes with the official admission of AfCA as the fifth Regional Associate of the IUCr at the 26th Congress and General Assembly of the IUCr in Melbourne, Australia in 2023.

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JUAMI, the joint undertaking for an African materials institute: building materials science research collaborations and capabilities between continents

S. J. L. Billinge

JUAMI, the joint undertaking for an African materials institute, is a project to build collaborations and materials research capabilities between PhD researchers in Africa, the United States, and the world. Focusing on research-active universities in the East African countries of Kenya, Ethiopia, Tanzania and Uganda, the effort has run a series of schools focused on materials for sustainable energy and materials for sustainable development.

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Synthesis, structure and Hirshfeld surface analysis of 2-oxo-2H-chromen-6-yl 4-tert-butylbenzoate: work carried out as part of the AFRAMED project

P. Kenfack Tsobnang, E. Ziki, S. Siaka, J. Yoda, S. Kamal, A. Bouraima, A. Djifa Hounsi, E. Wenger, E.-E. Bendeif and C. Lecomte

In the title coumarin derivative, the dihedral angle between the 2H-chromen-2-one ring system and the phenyl ring is 89.12 (5)°. In the crystal, the molecules are linked by C—H⋯O hydrogen bonds into [010] double chains.

CCDC reference: 2301781

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Synthesis and crystal structures of two related Co and Mn complexes: a celebration of collaboration between the universities of Dakar and Southampton

J. B. Orton, N. Diouf, R. S. Gueye, M. Gaye, I. E. Thiam and S. J. Coles

The synthesis and structures are reported of two transition-metal complexes involving 2-(2-hydroxyphenyl)benzimidazole with cobalt and manganese, arising from a UK–Africa collaboration.

CCDC references: 2306731; 2306730

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The African Light Source: history, context and future

S. H. Connell, K. Dollman, G. Kamel, S. A. Khan, E. Mitchell, S. K. Mtingwa, M. C. Newton, P. Ngabonziza, E. Nji, L. Norris and M. Zema

The African Light Source project towards a light source for the African continent is described.

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Synthesis and crystal structures of two 1H-benzo[d]imidazole derivatives: DFT and anticorrosion studies, and Hirshfeld surface analysis

N. Ghichi, A. Djedouani, D. Hannachid, M. E. Said, A. Benboudiaf, H. Merazig, L. Ouksel, A. Hellal and H. Stoeckli-Evans

The title benzimidazole compounds were synthesized by the condensation reaction of benzene-1,2-diamine with 4-methoxynaphthalene-1-carbaldehyde in the ratios 1:1 and 1:2, respectively. Both compounds exhibit significant anticorrosion properties with respect to iron and copper.

CCDC references: 1995360; 1995359

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The synthesis and crystal structure of (E)-2-{[(4-methoxynaphthalen-1-yl)methylidene]amino}-4-methylphenol: Hirshfeld surface analysis, DFT calculations and anticorrosion studies

A. A. Yahiaoui, N. Ghichi, D. Hannachi, B. Mezhoud, A. Djedouani, K. Kraim, A. Crochet and H. Stoeckli-Evans

The title Schiff base was synthesized by the reaction of 2-amino-4-methylphenol with 4-methoxynaphthalene-1-carbaldehyde in a 1:1 ratio. The compound exhibits significant anticorrosion properties for iron and copper.

CCDC reference: 2279139

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The synthesis and characterization of a series of cocrystals of an isoniazid derivative with butan-2-one and propan-2-one

M. C. Scheepers and A. Lemmerer

Four cocrystals containing N′-(butan-2-ylidene)pyridine-4-carbohydrazide and one cocrystal containing N′-isopropylideneisonicotinohydrazide were synthesized by reacting isoniazid with either butan-2-one (for the former) or acetone (for the latter). The coformers used to synthesize these cocrystals were 2,4-dihydroxybenzoic acid, 2,5-dihydroxybenzoic acid, 2-chloro-4-nitrobenzoic acid and 1-naphthoic acid. The cocrystals were characterized by SC-XRD, PXRD and DSC.

CCDC references: 2264437; 2264438; 2264434; 2264436; 2264435

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Synthesis, crystal structure and in-silico evaluation of arylsulfonamide Schiff bases for potential activity against colon cancer

S. O. Kolade, O. S. Aina, A. T. Gordon, E. C. Hosten, I. A. Olasupo, A. S. Ogunlaja, O. T. Asekun and O. B. Familoni

The successful synthesis, characterization and analysis of intermolecular interactions of arylsulfonamide Schiff bases have been achieved, alongside their evaluation for inhibitory effects on tankyrase poly(ADP-ribose) polymerase in the context of colon cancer, through in-silico testing.

CCDC reference: 2305610

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Crystal structure and Hirshfeld surface analysis of 1-[(E)-2-(3-nitrophenyl)diazen-1-yl]naphthalen-2-ol

M. A. Benaouida, A. Benosmane, M. Boutebdja and H. Merazig

The hydrazone form is the predominant form in the solid state. The naphthol and benzene fragments attached to the –N=N– moiety adopt the s-trans conformation. There are only two types of intermolecular interactions in the crystal structure: strong hydrogen-bonding C—H⋯O interactions and π–π stacking interactions.

CCDC reference: 2239846

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Synthesis and crystal structure of N-(5-acetyl-4-methylpyrimidin-2-yl)benzenesulfonamide

R. A. Mohamed-Ezzat, B. M. Kariuki and R. A. Azzam

N-(5-Acetyl-4-methylpyrimidin-2-yl)benzenesulfonamide was synthesized and structurally characterized. In the crystal, π–π interactions between the phenyl and pyrimidine groups of neighbouring molecules form molecular chains parallel to [010]. Adjacent chains are linked by N—H⋯N hydrogen-bonding interactions, resulting in a three-dimensional network.

CCDC reference: 2245275

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Synthesis and crystal structures of (E)-N′-(4-chloro-3-nitrobenzylidene)acetohydrazide and (E)-2-(4-chlorobenzylidene)-1-(quinolin-8-yl)hydrazine

T. Nasr, B. M. Kariuki, M. M. Elansary, R. Elhaggar and W. Zaghary

Two benzylidenehydrazinederivatives have been synthesized and structurally characterized.

CCDC references: 2235324; 2235323

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Crystal structure, Hirshfeld surface analysis, interaction energy and energy framework calculations, as well as density functional theory (DFT) computation, of methyl 2-oxo-1-(prop-2-ynyl)-1,2-dihydroquinoline-4-carboxylate

A. El-Mrabet, A. Haoudi, S. Dalbouha, M. K. Skalli, T. Hökelek, F. Capet, Y. Kandri Rodi, A. Mazzah and N. K. Sebbar

In the crystal of the title compound, C—H⋯O hydrogen bonds link the molecules, enclosing $[R_{2}^{2}]$ (10) and $[R_{2}^{2}]$ (16) ring motifs, into layers almost parallel to the bc plane. The layers are further connected by π–π stacking interactions.

CCDC reference: 2291603

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Syntheses and crystal structure of 4-[(pyridin-3-yl)diazenyl]morpholine and 1-[(pyridin-3-yl)diazenyl]-1,2,3,4-tetrahydroquinoline

S. Sokhna, I. Seck, I. E. H. Thiam, M. Presset, S. F. Ndoye, L. A. Ba, I. Samb, S. Coles, J. Orton, M. Seck, E. Le Gall and M. Gaye

The title triazene derivatives were synthesized using a diazonium intermediate that was obtained from 3-aminopyridine and isoamyl nitrite.

CCDC references: 2234291; 2234292

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Crystal structure of barium dinickel(II) iron(III) tris[orthophosphate(V)], BaNi₂Fe(PO₄)₃

S. Ouaatta, A. Bouraima, E. Benhsina, J. Khmiyas, A. Assani, M. Saadi and L. El Ammari

The orthophosphate BaNi₂Fe(PO₄)₃ crystallizes in the α-CrPO₄ type of structure, in which edge-sharing [Ni₂O₁₀] octahedra are linked to PO₄ tetrahedra and [FeO₆] octahedra to form a three-dimensional framework delimiting channels which house disordered Ba²⁺ cations.

CCDC reference: 2172184

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Synthesis and topology analysis of chloridotriphenyl(triphenyl phosphate-κO)tin(IV)

S. F. Pouye, S. Bernès, L. Yaffa, W. Diallo, I. Cissé, C. A. K. Diop, M. Sidibé and L. Diop

In the title compound, a (3,−1) critical point is found on the topology path connecting the (PhO)₃P=O and SnPh₃Cl moieties, showing that an actual O—Sn covalent bond is formed between the phosphate and the stannane derivatives.

CCDC reference: 2235598

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Synthesis, crystal structure and Hirshfeld surface analysis of di-μ₂-iodido-bis[(2,2′-biquinoline-κ²N,N′)copper(I)]

A. W. Temesgen, A. P. Novikov, A. G. Tskhovrebov, E. K. Kultyshkina and T. A. Le

In the layer structure of di-μ₂-iodido-bis[(2,2′-biquinoline-κ²N,N′)copper(I)], π–π interactions provide conectivity within and between the layers.

CCDC reference: 2237760

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Crystal structure and Hirshfeld surface analysis of 3-ethoxy-1-ethyl-6-nitroquinoxalin-2(1H)-one

S. Yousra, L. El Ghayati, T. Hökelek, F. Ouazzani Chahdi, J. T. Mague, Y. Kandri Rodi and N. K. Sebbar

The asymmetric unit of the title compound consists of two molecules differing to a small degree in their conformations. In the crystal, layers of molecules are connected by weak C—H⋯O hydrogen bonds and slipped π-stacking interactions.

CCDC reference: 2292321

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Crystal structure, Hirshfeld surface analysis, intermolecular interaction energies, energy frameworks and DFT calculations of 4-amino-1-(prop-2-yn-1-yl)pyrimidin-2(1H)-one

M. Lahyaoui, A. Haoudi, B. E. Kartah, A. Mazzah, T. Hökelek, J. T. Mague, Y. Kandri Rodi and N. K. Sebbar

The molecular structure of the title compound comprises an essentially planar pyrimidine ring from which the propynyl group is rotated by 15.31 (4)°. In the crystal, a tri-periodic network is formed by N—H⋯O, N—H⋯N and C—H⋯O hydrogen-bonding and slipped π–π stacking interactions, leading to narrow channels extending parallel to the c axis.

CCDC reference: 2308262

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Synthesis, crystal structure and Hirshfeld surface analysis of 1-(12-bromododecyl)indoline-2,3-dione

N. Rharmili, O. Abdellaoui, A. Haoudi, J. T. Mague, T. Hökelek, F. Ouazzani Chahdi, Y. Kandri Rodi, A. Mazzah and N. K. Sebbar

The pendant dodecyl chain in the title compound adopts an all-trans conformation apart from the gauche terminal C—C—C—Br moiety.

CCDC reference: 2301451

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Crystal structure, Hirshfeld surface and crystal void analysis, intermolecular interaction energies, DFT calculations and energy frameworks of 2H-benzo[b][1,4]thiazin-3(4H)-one 1,1-dioxide

E. Irrou, Y. Ait Elmachkouri, A. Mazzah, T. Hökelek, A. Haoudi, J. T. Mague, M. L. Taha and N. K. Sebbar

In the title compound, the thiazine ring exhibits a screw-boat conformation. In the crystal, corrugated layers of molecules parallel to the ab plane are formed by N—H⋯O and C—H⋯O hydrogen bonds together with C—H⋯π(ring) and S=O⋯π(ring) interactions. The layers are connected by additional C—H⋯O hydrogen bonds and π-stacking interactions.

CCDC reference: 2298958

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Synthesis, structure and Hirshfeld surface analysis of 1,3-bis[(1-octyl-1H-1,2,3-triazol-4-yl)methyl]-1H-benzo[d]imidazol-2(3H)-one

M. Zouhair, L. El Ghayati, H. El Monfalouti, H. Abchihi, T. Hökelek, M. Ahmed, J. T. Mague and N. K. Sebbar

The title molecule adopts a conformation resembling a two-bladed fan with the octyl chains in fully extended conformations. In the crystal, the molecules are linked by C—H⋯O and C—H⋯N hydrogen bonds and C—H⋯π interactions.

CCDC reference: 2307930

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Crystal structure and Hirshfeld surface analysis of a new benzimidazole compound, 3-{1-[(2-hydroxyphenyl)methyl]-1H-1,3-benzodiazol-2-yl}phenol

Z. Bouhidel, K. Sahli and A. Cherouana

In the title compound, the benzimidazole moiety subtends dihedral angles of 46.16 (7) and 77.45 (8)° with the benzene rings, which themselves form a dihedral angle of 54.34 (9)°. The crystal structure features O—H⋯N and O—H⋯O hydrogen-bonding interactions, which together lead to the formation of two-dimensional hydrogen-bonded layers parallel to the (101) plane, as well as π–π interactions

CCDC reference: 2311475

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Crystal structure reinvestigation and spectroscopic analysis of tricadmium orthophosphate

F.-Z. Cherif, M. Taibi, A. Boukhari, A. Assani, M. Saadi and L. El Ammari

The transition-metal orthophosphate, β-Cd₃(PO₄)₂, was synthesized by a solid-state reaction and characterized by single-crystal X-ray diffraction and EDS spectroscopy. It crystallizes in the monoclinic system, space group P2₁/n.

CCDC reference: 2306650

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Synthesis and crystal structure of bis(tert-butyl isocyanide-κC)[5,10,15,20-tetrakis(4-chlorophenyl)porphyrinato-κ⁴N]iron(II)

S. Nasri

Molecules of the title complex are centrosymmetric and the Fe—N bond lengths to the N atoms of the porphyrin ring indicate that the Fe^II atom is in the low-spin state.

CCDC reference: 975663

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Crystal structure, Hirshfeld surface analysis and energy frameworks of 1-[(E)-2-(2-fluorophenyl)diazan-1-ylidene]naphthalen-2(1H)-one

H. E. M. Akkache, N. Hamdouni, A. Boudjada, M. larbi Medjroubi, A. Mili and O. Jeannin

In the crystal, molecules of the title compound are linked into infinite sinusoidal chains along the [001] direction. The study demonstrated that dispersion energy was the most influential factor in the crystal organization of the compound.

CCDC reference: 2323843

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Crystal structure of poly[hexa-μ-bromido-bis{2-[1-(pyridin-2-yl)ethylideneamino]ethanolato}tetracopper(II)]

B. Traoré, N. Diouf, M. Kébé, R. Guéye-Sylla, I. E. Thiam, O. Diouf, P. Retailleau and M. Gaye

In the title Schiff base tetranuclear copper(II) complex, two discrete environments are present in the structure: CuN₂OBr₂ and CuBr₄. Two copper(II) cations are situated in distorted square-based pyramidal environment, while two copper(II) cations are located in distorted tetrahedral geometry.

CCDC reference: 2321970

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Crystal structure, Hirshfeld surface analysis, crystal voids, interaction energy calculations and energy frameworks and DFT calculations of ethyl 2-cyano-3-(3-hydroxy-5-methyl-1H-pyrazol-4-yl)-3-phenylpropanoate

Y. Ait Elmachkouri, E. Irrou, H. El Monfalouti, A. Mazzah, T. Hökelek, J. T. Mague, M. L. Taha and N. K. Sebbar

In the title molecule, the five- and six-membered rings are oriented at a dihedral angle of 75.88 (8)°. In the crystal, N—H⋯N hydrogen bonds form chains of molecules extending along the c-axis direction that are connected by inversion-related pairs of O—H⋯N into ribbons. The ribbons are linked by C—H⋯π(ring) interactions, forming layers parallel to the ab plane.

CCDC reference: 2327436

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Crystal structure, Hirshfeld surface analysis, crystal voids, interaction energy calculations and energy frameworks, and DFT calculations of 1-(4-methylbenzyl)indoline-2,3-dione

N. Rharmili, O. Abdellaoui, F. Ouazzani Chahdi, J. T. Mague, T. Hökelek, A. Mazzah, Y. Kandri Rodi and N. K. Sebbar

In the crystal of 1-(4-methylbenzyl)indoline-2,3-dione, a layer structure is generated by C—H⋯O hydrogen bonds and C—H⋯π(ring), π-stacking and C=O⋯π(ring) interactions.

CCDC reference: 2327435

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‘Young crystallographers’ rejuvenate crystallography in Germany

F. Meurer, J. Möbs, M. Nentwich, T. Weigel and J.-P. Wöhrle

The Young Crystallographers were founded in 2013 within the German Crystallographic Association and have revitalized the field of crystallography by establishing collaboration and support among early career researchers, organizing educational events, and promoting scientific contributions on national and international stages.

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Synthesis and crystal structure of the adduct between 2-pyridylselenyl chloride and isobutyronitrile

A. W. Temesgen, A. A. Sapronov, A. S. Kubasov, A. S. Novikov, T. A. Le and A. G. Tskhovrebov

The reaction between 2-pyridylselenenyl chloride and isobutyronitrile results in the formation of the corresponding cationic pyridinium-fused 1,2,4-selenodiazole, namely, 3-(propan-2-yl)-1,2,4-[1,2,4]selenadiazolo[4,5-a]pyridin-4-ylium chloride, C₉H₁₁N₂Se⁺·Cl⁻, in high yield (89%). The bifurcated Se⋯Cl⁻⋯H—Cl chalcogen-hydrogen-bonding interactions were analysed by DFT followed by a topological analysis of the electron-density distribution.

CCDC reference: 2328546

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Crystal structure and Hirshfeld surface analysis of (Z)-N-{chloro[(4-ferrocenylphenyl)imino]methyl}-4-ferrocenylaniline N,N-dimethylformamide monosolvate

R. Sghyar, A. Bentama, A. Haoudi, A. Mazzah, J. T. Mague, T. Hökelek, E. M. EL Hadrami and N. K. Sebbar

The molecule of the title compound is twisted end to end so that the ferrocenyl groups are nearly perpendicular to one another. The central N/C/N unit is disordered. In the crystal, several C—H⋯π(ring) interactions lead to the formation of layers parallel to (010), which are connected by further C—H⋯π(ring) interactions.

CCDC reference: 2329443

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Synthesis and crystal structure of N-phenyl-2-(phenylsulfanyl)acetamide

R. A. Mohamed-Ezzat, B. M. Kariuki and G. H. Elgemeie

In the crystal of the title compound, N—H⋯O hydrogen bonds form chains of molecules along the [100] direction. The chains are linked by C—H⋯π interactions, forming a three-dimensional network.

CCDC reference: 2311395

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Crystal structure, Hirshfeld surface analysis, calculations of crystal voids, interaction energy and energy frameworks as well as density functional theory (DFT) calculations of 3-[2-(morpholin-4-yl)ethyl]-5,5-diphenylimidazolidine-2,4-dione

H. Lamssane, A. Haoudi, B. E. Kartah, A. Mazzah, J. T. Mague, T. Hökelek, Y. Kandri Rodi and N. K. Sebbar

In the title molecule, the imidazolidine ring slightly deviates from planarity and the morpholine ring exhibits the usual chair conformation. In the crystal, N—H⋯O and C—H⋯O hydrogen bonds form helical chains of molecules extending parallel to the c axis that are connected by C—H⋯π(ring) interactions into a tri-periodic network.

CCDC reference: 2340426

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Expression, purification and crystallization of the photosensory module of phytochrome B (phyB) from Sorghum bicolor

S. M. Shenkutie, S. Nagano and J. Hughes

A heterologous holophytochrome overproduction system has been developed to produce large quantities of three holoprotein constructs of phytochrome B from S. bicolor for crystallization. The results showed that the diffraction quality of the crystals could be improved by removing flexible regions, shifting the fusion tag and changing the type of ligand.

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Diethyl 2,2′-[({2-chloro-5-[(2-ethoxy-2-oxoethyl)(2-methylindolin-1-yl)carbamoyl]phenyl}sulfonyl)azanediyl]diacetate

Y. Ramli, W. Al Garadi, M. El Hafi, E. Lhoussaine, E. M. Essassi, A. Alsubari and J. T. Mague

The majority of the title molecule is disordered over two closely spaced locations; the conformation is approximately U-shaped. In the crystal, chains of molecules extending along the a-axis direction are formed by C—H⋯O and C—H⋯Cl hydrogen bonds and are connected into a corrugated layer structure parallel to the ab plane by C—H⋯O hydrogen bonds and C—H⋯π(ring) interactions.

CCDC reference: 2280340

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Crystal structures of three homologues with increasing ring size: 2-methoxy-4-(thiophen-2-yl)-5,6,7,8-tetrahydroquinoline-3-carbonitrile, 2-methoxy-4-(thiophen-2-yl)-6,7,8,9-tetrahydro-5H-cyclohepta[b]pyridine-3-carbonitrile and 2-methoxy-4-(thiophen-2-yl)-5,6,7,8,9,10-hexahydrocycloocta[b]pyridine-3-carbonitrile

A. M. S. Hebishy, G. H. Elgemeie, L. M. Gouda and P. G. Jones

The title compounds form a homologous but non-isotypic series with appreciable differences in molecular form. In each case, the packing is determined by two C—H⋯N hydrogen bonds.

CCDC references: 2245466; 2245465; 2245464

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Crystal structure of 3-(benzo[d]thiazol-2-yl)-6-methyl-2H-chromen-2-one

A. E. M. Abdallah, G. H. Elgemeie and P. G. Jones

The title molecule is almost planar, with an intramolecular S⋯O=C contact. The packing is a layer structure with dimeric units connected by a C—H⋯O=C hydrogen bond.

CCDC reference: 2256779

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Crystal structure of 5-(β-D-glucopyranosylthio)-N-(4-methylphenyl)-1,3,4-thiadiazol-2-amine

M. A. Abu-Zaied, A. M. S. Hebishy, G. H. Elgemeie, H. T. Salama and P. G. Jones

In the title compound, the angle between the tolyl and thiadiazole rings is 9.2 (1)°. The hydrogen bonding is a combination of a ribbon involving hydrogen bonds of the sugar residues, and a layer based on N—H⋯O and O—H⋯N hydrogen bonds.

CCDC reference: 2269285

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Crystal structure of 2-{[5-(methylsulfanyl)-4-phenyl-4H-1,2,4-triazol-3-yl]methyl}benzo[d]thiazole

R. A. Azzam, G. H. Elgemeie, H. A. Elboshi and P. G. Jones

In the crystal structure of the title compound, the triazole ring exhibits interplanar angles of ca 64 and 77° with the phenyl and benzothiazole planes, respectively. The packing involves three borderline C—H⋯N contacts and a pairing of the triazole rings across an inversion centre.

CCDC reference: 2287438

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6,8-Dichloro-3-(pyridin-2-yl)-2-[1-(pyridin-2-yl)ethyl]-1,2-dihydroquinoxaline

F. P. Malan, A. M. Mansour and A.-L.E. Manicum

The synthesis and single-crystal X-ray structure of a substituted quinoxaline compound is described.

CCDC reference: 2285764

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3-(2-Bromoethyl)-5,5-diphenylimidazolidine-2,4-dione

W. Guerrab, A. El Moutaouakil Ala Allah, A. Alsubari, J. T. Mague and Y. Ramli

The imidazolidine ring is slightly ruffled while the attached phenyl rings are rotated well out of its mean plane. In the crystal, N—H⋯O hydrogen bonds form inversion dimers, which are connected into layers parallel to (101) by C—H⋯O hydrogen bonds. The layers are connected into a three-dimensional network by additional C—H⋯O hydrogen bonds and C—H⋯π(ring) interactions.

CCDC reference: 2235944

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15,15-Diphenyl-2,3,4,5,6,8,9,11,12-octahydroimidazo[2,1-h][1,4,12]trioxa[7]thia[9]azacyclotetradecin-14(15H)-one

W. Guerrab, A. El Moutaouakil Ala Allah, A. Alsubari, J. T. Mague and Y. Ramli

The title molecule adopts a cup-shaped conformation. In the crystal, layers lying parallel to the ab plane are formed by C—H⋯O hydrogen bonds and C—H⋯π(ring) interactions.

CCDC reference: 2241205

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3-Methyl-2-(methylsulfanyl)-5,5-diphenyl-3,5-dihydro-4H-imidazol-4-one

A. El Moutaouakil Ala Allah, W. Guerrab, A. Alsubari, J. T. Mague and Y. Ramli

In the title molecule, C₁₇H₁₆N₂OS, the dihydroimidazolone ring is slightly puckered and the methylsulfanyl group is nearly coplanar with it.

CCDC reference: 2246179

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N-(4-Methoxy-2-nitrophenyl)-2-(3-methyl-2-oxo-1,2-dihydroquinoxalin-1-yl)acetamide

M. Missioui, J. T. Mague, A. Alsubari, M. Ansar, E. M. Essassi and Y. Ramli

The quinoxaline unit in the title molecule is slightly puckered [dihedral angle between the rings = 2.07 (12)°] while the whole molecule adopts an L-shaped conformation. The packing in the crystal is governed by C—H⋯O hydrogen bonds and slipped π-stacking interactions.

CCDC reference: 2245645

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(2,2′-Bipyridyl)(η⁶-p-cymene)iodidoruthenium(II) hexafluoridophosphate

M. T. Kelani, A. Muller and K. Lammertsma

The title compound crystallizes in the triclinic P $[\overline{1}]$ (Z = 2) space group as a half-sandwich complex resembling a three-legged piano stool. The crystal packing features C—H⋯F/I interactions.

CCDC reference: 2260167

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(N-Benzoyl-N-phenylhydroxylaminato)carbonyl(triphenylarsine)rhodium(I)

M. A. Motente, J. Venter and A. Brink

The molecular structure of the title compound, [Rh(BPHA)(CO)(AsPh₃)] (where BPHA = N-benzoyl-N-phenylhydroxylaminate), has a distorted square-planar coordination environment around the central Rh^I atom, defined by a CO₂As coordination set.

CCDC reference: 2257230

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Co-crystallization of N′-benzylidenepyridine-4-carbohydrazide and benzoic acid via autoxidation of benzaldehyde

I. B. Setshedi, A. Lemmerer and M. G. Smith

The 1:1 co-crystal N′-[(2-methylphenyl)methylidene]pyridine-4-carbohydrazide–benzoic acid (1/1) formed unexpectedly after autoxidation of benzaldehyde during the slow evaporation process of a solution of isoniazid in benzaldehyde. The original intent of the synthesis was to modify isoniazid with benzaldehyde and crystallize the product in order to improve efficacy against Mycobacteria species, but benzoic acid formed spontaneously and co-crystallized with the intended product, N′-benzylidenepyridine-4-carbohydrazide.

CCDC reference: 2250754

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Crystal structure of dibenzylammonium hydrogen (4-aminophenyl)arsonate monohydrate

B. Traoré, W. Diallo, M. Sidibé, L. Diop, L. Plasseraud and H. Cattey

The title salt consists of three components, comprising one dibenzylammonium cation, [(C₆H₅CH₂)₂NH₂]⁺, one hydrogen (4-aminophenyl)arsonate anion, [H₂NC₆H₄As(OH)O₂]⁻, and one molecule of water. In the crystal, these components are organized in infinite zigzag chains via intermolecular hydrogen bonds. Weak interactions between the chains lead to a three-dimensional network.

CCDC reference: 2297206

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[1,1′-Bicyclohexane]-1,1′-diol

Z. Mtendeni, E. C. Hosten and R. Betz

The title compound is a symmetric diol derived from the pinacol coupling of cyclohexanone. The asymmetric unit contains three complete molecules. Cooperative hydrogen bonding connects the individual molecules into infinite chains propagating along the crystallographic a-axis direction.

CCDC reference: 2306283

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trans-Bis[bis(diphenylphosphanyl)methane-κ²P,P′]dichloridoruthenium(II): a triclinic polymorph

M. T. Kelani, A. Muller and K. Lammertsma

The title compound crystallizes with two different inversion-symmetric molecules having a distorted octahedral {P₄Cl₂} coordination environment, and an average P—Ru—P bite angle of 71.1°.

CCDC reference: 2307000

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rac-Hydroxyisovaleric acid

L. Dasi, E. C. Hosten and R. Betz

The title compound is the constitutional isomer of α-hydroxybutanoic acid. In the crystal, hydrogen bonds involving the alcoholic hydroxyl group give rise to centrosymmetric dimers that are extended to sheets perpendicular to the crystallographic c axis.

CCDC reference: 2320961

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Prop-2-ynyl 3-methoxy-4-(prop-2-ynyloxy)benzoate

C. Moodley, A. Muller and Y. H. Belay

The title compound, C₁₄H₁₂O₄, was prepared via alkylation of 4-hydroxy-3-methoxybenzoic acid with propargyl bromide in the presence of K₂CO₃.

CCDC reference: 2333706

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Celebrating work published by African researchers in IUCr journals

Edited by Susan Bourne, Delia Haynes and Michele Zema