: By taking advantage of self-complementary p–p stacking and CH–p interactions, a series of discrete quadruple stacks were constructed through the self-aggregation of U-shaped dirhodium metallotweezer complexes featuring various planar polyaromatic ligands. By altering the conjugate stacking strength and bridging ligands, assemblies with a range of topologies were obtained, including a binuclear D-shaped macrocycle, tetranuclear open-ended cagelike frameworks, and duplex metallotweezer stacking structures.

A novel series of binuclear complexes with Mn(II), Co(II), Ni(II), Cu(II), Zn(II), and Cd(II) ions derived from a pentadentate azo dye ligand (H3L) was synthesized and structurally investigated by various physicochemical analyses, namely, scanning electron microscopy, transmission electron microscopy, NMR, UV–visible spectroscopy, and Electron-Spin Resonance (ESR) studies. The infrared spectral data revealed characteristic bands due to ν(N=N) and ν(C=O) at 1606 and 1631 cm−1 in the free ligand.

يتناول المقرر الإطار المعرفي للنظرية التربوية الإسلامية، وتوظيفها عمليًا، وبأسلوب يجمع بين الأصالة والمعاصرة يرتكز على مصادر الشريعة الإسلامية ويعكس مقاصدها وغاياتها، وتحديد بعض المتطلبات والمعالم لبناء نظرية تربوية إسلامية في مجال المناهج والتعليم وتمكين العلاقة الوثيقة بينها.

يتناول المقرر دراسة تطوير مناهج العلوم الشرعية بمراحل التعليم العام بالمملكة العربية السعودية، وتحليل محتويات وثيقة مناهج العلوم الشرعية في التعليم العام، للتعرف على الأسس التربوية لبناء مناهج العلوم الشرعية المطورة، ومكوناتها، ودراسة متطلبات تدريسها، وتحليل محتويات كتبها المدرسية وأدلة المعلم في تدريسها، ودراسة كفايات ومهارات واستراتيجيات تدريس مناهج العلوم الشرعية، وتدريب الطلاب على النقد الموضوعي والتحليلي لمناهج العلوم الشرعية.

The aim of this paper is to study the individual and social benefits behind constructing stable R&D networks. We find that the equilibrium outcomes of a stable network are related to the number of competitors. As they increase, the individual outcomes and the total welfare decrease. This implies that in the individual and social perspectives, small stable networks are more desirable than the large ones. Furthermore, when comparing the stability of the components of a network with a complete network, we conclude two main observations.

While the empirical findings have confirmed the importance of the centers in preserving the characteristic features of the R&D network, this paper will focus theoretically on central firms in the star networks. The analysis of the equilibrium outcomes reveals the impact of the market structure on centralizing of firms and on expanding the star network. It seems that when the differentiation rate between products of firms is high, the development of the star network contributes to increasing the individual and social outcomes.

The presence of Pb(II) ions and antibiotics in water beyond the permissible limits are among the leading factors causing water pollution. Therefore, their identification is quite necessary. In this article, we are concerned with a new dinuclear uranyl coordination compound holding a 1,3-bis(2-oxy-3-methoxybenzylidene)propan-2-olate moiety, in which each uranyl ion is seven coordinated. To obtain additional insights into the structure, DFT analyses were performed.

A new dinuclear uranyl salen coordination compound, [(UO2)2(L)2]·2MeCN [L = 6,6’-((1E,1’E)-((2,2-dimethylpropane-1,3-diyl)bis(azaneylylidene))-bis(methaneylylidene))bis(2-methoxyphenol)], was synthesized using a multifunctional salen ligand to harvest visible light for the selective photocatalytic reduction of CO2 to MeOH. The assembling of the two U centers into one coordination moiety via a chelating–bridging doubly deprotonated tetradentate ligand allowed the formation of U centers with distorted pentagonal bipyramid geometry.