10.1021/ic502791y
The solid-phase synthesis and screening platform was successful in identifying lead caging groups that release ligands with visible light, demonstrating the utility of this approach for discovering new metal-based caging groups.
10.1515/znb-2011-0209
The research fouse on the reactions between carbon dioxide (CO2) and various organic bases, specifically diamines. The purpose of this study is to understand and detail the products formed when diamines react with CO2, which is relevant for capturing carbon dioxide, a greenhouse gas. The research concludes that the reactions lead to the formation of zwitterionic carbamates, which are stable compounds resulting from the interaction between the diamines and CO2. The study also provides insights into the crystal structures of these products, revealing the presence of strong intermolecular hydrogen bonds and the formation of extended networks in the compounds. Key chemicals used in the process include diamines such as 1,2-diaminoethan, 1,3-diaminopropan, and N,N,N′-trimethylethylendiamin, along with carbon dioxide (CO2).
10.1080/00397911.2011.582218
The study presents a novel, efficient, and environmentally friendly method for synthesizing 2-substituted 1,4,5,6-tetrahydropyrimidine derivatives using N-bromosuccinimide (NBS) as a catalyst under ultrasonic irradiation in an aqueous medium. The researchers from Sri Venkateswara University, Tirupati, India, aimed to develop a green chemistry protocol that avoids toxic organic solvents and harsh reaction conditions. The synthesis involves reacting various aldehydes with 1,3-diaminopropane in the presence of NBS. The aldehydes, which can be aromatic or heterocyclic, serve as the substituents on the tetrahydropyrimidine ring, while 1,3-diaminopropane acts as the core structure for ring formation. The use of water as a solvent and ultrasonic irradiation significantly reduces reaction times and enhances yields, with the products obtained in 14–25 minutes compared to conventional methods that require several hours. The compounds synthesized were characterized by infrared spectroscopy, NMR, liquid chromatography–mass spectrometry, and elemental analyses, confirming their structures and purity. This method offers several advantages, including good yields, short reaction times, and an eco-friendly process, making it a promising approach for the synthesis of tetrahydropyrimidine derivatives with potential applications in pharmaceuticals and other industries.
10.1016/j.molstruc.2007.01.064
The research focuses on the synthesis, structure, and luminescent properties of a novel 3D porous metal-organic framework (MOF) with rutile topology, denoted as Cd(CTC)(HPDA)·(H2O) (1). The MOF was synthesized using 1,3-propanediamine (PDA) as a template, with cadmium chloride dihydrate and cis,cis-1,3,5-cyclohexanetricarboxylate (CTC) as reactants. The synthesis involved mixing these compounds in N,N-dimethylformamide, ethylene glycol, and water, followed by the slow diffusion of PDA at 65°C for five days, yielding colorless block-shaped crystals. The product was characterized using X-ray crystallography, which revealed a 3D network with quadrangular channels. The structure was further analyzed using thermogravimetric analysis (TGA), differential thermal analysis (DTA), powder X-ray diffraction (XRD), inductively coupled plasma (ICP) analysis, and infrared (IR) spectroscopy. The compound exhibited intense fluorescence at 364 nm upon excitation at 240 nm at room temperature, indicating potential as a photoactive material. The research was supported by several funding agencies and the crystallographic data was deposited with the Cambridge Crystallographic Data Centre.
10.1016/S0020-1693(01)00605-3
The research aimed to investigate the impact of hydrogen bonding on coordination, particularly semi-coordination, in transition metal complexes, using trans-di(salicylato)bis(1,3-diaminopropane-N,N’)copper(II) as a model compound. The study employed single-crystal X-ray diffraction methods at 193(2) K to determine the crystal and molecular structure of the complex. The central copper(II) ion was found to occupy a center of symmetry within a monomeric complex unit, with the coordination polyhedron described as an axially elongated distorted octahedron, indicative of semi-coordination. The research concluded that semi-coordination is characterized by electrostatic attraction between the central copper(II) cation and repulsion between an electron lone pair of a ligand atom and the electron lone pair at the copper(II) 3dz2 atomic orbital. The chemicals used in the synthesis of the complex included salicylic acid, CuCO3, and 1,3-diaminopropane, with the final product being characterized by various analytical methods.
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