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Electric Literature of 499-40-1, Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn’t involve a screen. 499-40-1, C12H22O11. A document type is Article, introducing its new discovery.
A series of the half-sandwich Ir(III) and Rh(III) complexes [M(eta5-Cpx)(dpa)X]PF6 (M = Ir for 1?6 and Rh for 7?12) containing N-(pyridin-2-yl)pyridin-2-amine (2,2?-dipyridylamine, dpa), pentamethylcyclopentadienyl (Cp*; for 1?5 and 7?11) or 1,2,3,4-tetramethyl-5-phenylcyclopentadienyl (Cpph; for 6 and 12) ring, and various monodentate ligands (X), specifically Cl? (for 1, 6, 7 and 12), Br? (for 2 and 8), I? (for 3 and 9), valproato (VP; for 4 and 10) or 4-phenylbutyrato (PB; for 5 and 11), was prepared. The complexes were thoroughly characterized by elemental analysis, IR and NMR spectroscopy and mass spectrometry. A single-crystal X-ray analysis was performed for complex [Ir(eta5-Cpph)(dpa)Cl]PF6 (6), revealing a pseudo-octahedral piano-stool geometry with a bidentate N,N?-coordinated dpa ligand, a penta-hapto coordinated Cpph ring and a monodentate chlorido ligand. The crystal structure of complex 6 is stabilized by N?H?F, C?H?F, C?H?Cl, C?H?C and C?F non-covalent contacts. Complexes 1?12 were screened for their in vitro cytotoxicity against the A2780 human ovarian carcinoma cell line. The best-performing iridium(III) complex 6 showed markedly higher activity (IC50 = 23.5 muM) than complexes 1?3, 5, 9 and 12, whose IC50 ranged from 68.7 to 87.1 muM. Iridium(III) complex 4 and rhodium(III) complexes 7, 8, 10 and 11 were inactive against the A2780 cells in the tested concentration range (IC50 > 100.0 muM). The chlorido complexes 1, 6, 7 and 12 were studied by 1H NMR spectroscopy for their hydrolytic stability in the 20% DMF-d7/80% D2O and 20% MeOD-d4/80% D2O mixture of solvents, revealing Ir(III) complexes 1 and 6 as stable, while Rh(III) complexes 7 and 12 partially hydrolysed in the used medium. Moreover, hydrophobicity (lipophilicity) of complexes 1?12 was studied by an octanol/water partition (logP).
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Reference£º
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics