Ашық рұқсат
Рұқсат берілді
Тек жазылушылар үшін
Том 51, № 2 (2025)
Articles
Platinum dibromide complexes with 10-(aryl)phenoxarsines: synthesis, structure, luminescent and biological properties
Аннотация
The reactions of 10-(aryl)phenoxarsines (L1 = 10-(4-tolyl)phenoxarsine, L2 is 10-(4-fluorophenyl) phenoxarsine, L3 is 10-(3-fluorophenyl)phenoxarsine, and L4 is 10-(2-methoxyphenyl)phenoxarsine) with Pt(COD)Br2 afford platinum(II) complexes [Pt(L1–4)2Br2] (I–IV). The complexes are characterized by elemental analysis, IR spectroscopy, mass spectrometry, and NMR (1Н, 13С, 195Pt) spectroscopy. The Pt(II) complexes in solutions exist as two isomers mutually exchanging at a rate intermediate in the NMR time scale. The molecular structures of complexes cis-II · chloroform, trans-II, and cis-IV · dichloromethane are determined by XRD (CIF files CCDC nos. 2368769 (cis-II · chloroform), 2368770 (trans-II), and 2368771 (cis-IV · chloroform)). The platinum(II) dibromide complexes can crystallize as both cis and trans isomers. The study of the photophysical properties of the platinum(II) complexes shows that the trans isomers are characterized by emission in the orange spectral range, whereas the cis isomers almost does not luminesce. 10-(Aryl)phenoxarsines and their platinum(II) complexes are tested to cytotoxicity against the M-HeLa and HuTu 80 human cancer cell lines and hepatocyte-like cells of the Сhang liver line.
75-88
The role of 2-hydroxypyridine in the formation of pivalate Zn–Gd complexes
Аннотация
The reactions of [Zn(Piv)2]n and [Gd(Piv)3]n or Gd(NO3)3 ∙ 6H2O with 2-hydroxypyridine (Hhp) or its 6-methyl derivative (Hmhp) afford heterometallic complexes [ZnGd(Рiv)5(Hhp)2] · 0.5H2O (I), [Zn2Gd (Рiv)6(Hhp)2NO3] ∙ 2C6H6 (II), [Zn3GdO(Рiv)7(Hmhp)2] ∙ MeCN (III) и [Zn2Gd(Рiv)6(Hmhp)2NO3] ∙ ∙ 0.5MeCN (IV) respectively. In the carboxylate metal cage of the synthesized complexes, the Hhp and Hmhp molecules in the form of 2-pyridone are coordinated by the metal atoms via the monodentate mode through the oxygen atoms. The introduction of Et3N into the reaction with [Zn(Рiv)2]n, Gd(NO3)3 ∙ 6H2O, and Hhp is found to result in the formation of compound [Zn4Gd2(OH)2(Рiv)6(hp)6(Hhp)2] (V) in which the 2-hydroxypyridine anions perform the bridging function. The molecular structures of complexes I‒V are determined by XRD (CIF files CCDC nos. 2365419–2365423).
89-102
Synthesis and structure of water-soluble complexes of copper fumarate and succinate with monoethanolamine
Аннотация
New water-soluble copper(II) complexes with dicarboxylic acids were obtained by the heterogeneous reaction of copper hydroxy carbonate with succinic or fumaric acid in water at 50°C. The additional introduction of monoethanolamine (MEA) into the complexes ensured high solubility of copper succinate and fumarate. The structures of the complexes [Cu(Suc) · 2MEA] · H2O and [Cu(Fum) · 2MEA] · H2O were studied by X-ray diffraction (CCDC nos. 2352578 and 2352579, respectively). The compounds were found to have a polymeric structure composed of zigzag chains.
103-113
Substitution of the internal AsO3– ligand in complex [{Re4As2(AsO)2}(CN)12]8–
Аннотация
The reaction of the tetrahedral rhenium arsenide cluster K8[{Re4As2(AsO)2}(CN)12] with molten KF · HF is studied. The reaction affords complex K6[{Re4As2(AsO)F}(CN)12] · 3H2O · KF (I). The substitution of one (µ3-AsO)3– ligand by µ3-F– is shown to occur during the reaction, and the remained internal ligands are not involved in the reaction. The phase purity of the synthesized compound and the absence of impurities of different compositions are confirmed by phase X-ray diffraction (XRD) and mass spectrometry. The structure of complex I is determined by single-crystal XRD (CIF file CCDC no. 2362544).
114-121
Luminescence properties of heterometallic lanthanide complexes based on lithium β-diketonate bearing tert-butyl and acetal group
Аннотация
Nonsymmetrical lithium β-diketonate (LiL) containing tert-butyl and acetal substituents at the dicarbonyl cage has been synthesized for the first time and is structurally characterized (CIF file CCDC no. 2364039 (I)). The reactions of functional lithium β-diketonate with salts of trivalent rare-earth metals in methanol afford heterobinuclear complexes [(LnL3)(LiL)(MeOH)] (Ln = Eu, Gd, Tb). The structures of the complexes are characterized by X-ray diffraction (XRD) (CIF files CCDC nos. 2364040 (II), 2364041 (III), 2364042 (IV)).
122-131
Spin states of the cobalt(II) complex with bis(pyrazol-3-yl)pyridine and pH-sensitive functional groups and its deprotonated derivatives
Аннотация
The reaction of 2,6-bis(pyrazol-3-yl)pyridine H2L bearing pH-sensitive imino groups with cobalt perchlorate hexahydrate followed by the addition of 1,8-diazabicyclo[5.4.0]undec-7-ene affords the cobalt(II) complex [Co(H2L)2](ClO4)2 (I) and its doubly deprotonated analog [Co(HL)2]0 (II). The compounds are characterized by NMR spectroscopy, mass spectrometry, and XRD. The influence of the deprotonation of ligand H2L with a chosen base on the spin state of the cobalt(II) ion in a solution is studied by in situ NMR spectroscopy. Complex I is shown to retain its high-spin state in the whole temperature range accessible in deuterated methanol (200–325 K) both before and after the deprotonation of all pH-sensitive imino groups. However, the doubly deprotonated form of complex I (complex II–2MeOH) exists in the crystal (CIF file CCDC no. 2351546) in the low-spin state, which is the first example of the pH-induced stabilization of this state for the cobalt(II) complexes with 2,6-bis(pyrazol-3-yl)pyridines.
132-142