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Том 42, № 4 (2016)
- Год: 2016
- Статей: 7
- URL: https://bakhtiniada.ru/1070-3284/issue/view/13283
Article
Development of some important nitrogen donor ligands for transition metal homogeneous catalysis
Аннотация
This review provides a broad overview of the literature related to the importance of ligands in homogeneous catalysis. In particular, it describes the types of nitrogen donor ligands that have typically been used for homogeneous catalysis. We surveyed the important transition metal homogenous catalysts explicitly from 2011 up to early 2014 and summarize their comparative catalytic activities. Generally, the main factors observed are the ligand structure, electron donor property and steric bulk which can affect the catalytic activity. Electron count and inductive effect can also influence the efficiency of homogeneous catalyst.
225-251
Synthesis and structure of polycrystalline adducts of Co(II) azomethine complexes with redox-active 2,4,6,8-tetrakis-(tert-butyl)phenoxazin-1-one
Аннотация
The six-coordinate cobalt complexes, C57H63.50N4.50O4Co (IIa), C60H69N5O4Co (IIb), C58H67N3O8Co (IIc), C56H61N5O10Co (IId), C56H63N3O6Co (IIe), C58H66N4O6Co (IIf), and C58H63N7O8Co (IIg), adducts of high-spin tetrahedral Co(II) bis(salicylaldiminates) (C29H24.50N3.50O2Co (Ia), C32H30N4O2Co (Ib), C30H28N2O6Co (Ic), C28H22N4O8Co (Id), C28H24N2O4Co (Ie), C30H27N3O4Co (If), and C30H24N6O6Co (Ig)) and redox-active 2,4,6,8-tetrakis(tert-butyl)phenoxazin-1-one (L), were synthesized and studied for structure and magnetic properties. Complexes IIa–IIg have octahedral structure (CIF files CCDC nos. 1403920 (IIf), 1403922 (IIg)) and exist in the ground low-spin state (ls-CoIII-SQ), which arises upon intramolecular single-electron redox process in the ligand–metal system. The presence of substituents of different nature in the azomethine ligands of IIa–IIg does not induce any significant changes in their magnetic properties.
252-259
Cobalt(III) complexes with biguanide derivatives: Synthesis, structures, and antiviral activity
Аннотация
Three Co(III) complexes with biguanide derivatives [Co(NH2C(=NH)NHC(=NH)NR1R2)3]Cl3 (R1R2 = Me2 (I), Et2 (II), and HsBu (III)) were obtained and characterized by elemental analysis, IR spectroscopy, and electronic absorption spectroscopy. Structure III was confirmed by X-ray diffraction (CIF file CCDC no. 1401783). Complexes I–III and [M(SC(NH2)2)4]Cl2 (M = Pd, Pt, and [Co(En)3]Cl3) were tested for in vitro antiviral activity against the A/California/07/09 (H1N1pdm09) influenza virus. The best results were achieved with complex III and both thiourea complexes.
260-266
Binuclear metallochelates of 2-(N-tosylamino)benzal-2’-(hydroxymethyl)aniline: Syntheses, structures, and magnetic properties
Аннотация
Binuclear complexes of Co(II), Сu(II), and Pd(II) with 2-(N-tosylamino)benzal-2’-(hydroxymethyl)aniline are synthesized. The compositions and structures of the ligand and complexes are determined from the data of elemental analysis, IR spectroscopy, 1Н, 13С, and 15N NMR spectroscopy, X-ray absorption spectroscopy, and magnetochemical measurements in a temperature range of 294–77.4 K. All complexes are dimeric. The Cu…Cu and Cо…Cо distances equal to 3.03 and 2.99 Å, respectively, are obtained for the Cu(II) and Co(II) complexes. These complexes are characterized by the antiferromagnetic exchange interaction with 2J = –630 and –42 cm–1, respectively.
267-273
Synthesis, crystal structure, and luminescent property of two novel Zn/Co(II) coordination polymers with a linear bis-imidazole and dicarboxylate ligands
Аннотация
The linear linker 1,3-bis(2-methylimidazolyl)propane (Bmip) has been used to construct two new coordination polymers with Zn2+ and Co2+ ions and carboxylate donor ligand viz., 4,4’-oxydibenzoic acid (H2Oba). Compounds formed hydrothermally are [Zn(Bmip)(Oba)]n (Ι), [Co(Bmip)(Oba)]n (II). Complexes Ι and II have been characterized by single crystal X-ray diffraction (CIF files CCDC nos. 1033354 (I), 1001813 (II)), IR spectroscopy, thermogravimetry, elemental analysis and powder X-ray diffraction. Single crystal X-ray analysis revealed that complexes Ι and II are isostructural, which exhibit 2D 44-sql net. And the adjacent 44-sql net are further inforced through weak noncovalent C–H···π and H-bonding to form a 3D supramolecular framework. Furthermore, the photoluminescence property of complexes Ι and II in the solid state at room temperature was also investigated.
274-277
Four novel metal–organic frameworks based on 3,4,7,8-tetramethyl-1,10-phenanthroline: Syntheses, structures, and thermal properties
Аннотация
Four novel metal–organic frameworks, [Cu(Tmp)2(H2O)] · NO3 (I) (Tmp = 3,4,7,8-tetramethyl-1,10-phenanthroline), [Mn(Tmp)2(H2O)2] · 2NO3 · H2O (II), [Pb(Tmp)(CH3COO)2] · 3H2O (III) and [Zn(Tmp)2(H2O)2] · 2NO3 · 2H2O (IV), have been synthesized and characterized by single crystal X-ray diffraction (CIF files CCDC nos. 88362–88365 for I–IV, respectively), IR spectroscopy, elemental analysis and thermogravimetric analysis. Both I and II complexes are crystallized in monoclinic system with space groups C2/c, P21/c, respectively, while III and IV complexes are crystallized in triclinic system with space groups \(P\overline 1 \). Generally, these crystal structures are stabilized by O–H···O hydrogen bonds and π–π interactions between the phenanthroline rings of neighboring molecules. Thermogravimetric analyses of compounds I–IV display considerable thermal stability.
278-284
Self assembly of three new copper coordination polymers based on N-[(3-pyridine)-sulfonyl]aspartate: Synthesis and structure
Аннотация
Three new copper coordination polymers [Cu(L) · 6H2O]n (I), [Cu2(L)2]n (II), and [Cu(HL)2]n (III), where H2L is N-[(3-pyridine)-sulfonyl]aspartate, have been synthesized and characterized by singlecrystal X-ray diffraction (CIF files CCDC nos. 1435871 (I), 1435872 (II), 1435873 III), elemental analysis and IR spectra. Moreover, the variable-temperature magnetic susceptibility had been studied for complex I. A structural comparison of these polymers suggests that different reaction temperatures play important role in the construction of resulting architectures for I–III.
285-291