Unique tetranuclear heterometallic compound [Na2Zn2{(4-py)C(H)(NOH)}2(CH3COO)6(H2O)4].2H2O with luminescent properties

Coropceanu, Eduard B.; Croitor, Lilia; Siminel, Anatolii V.; Fonarı, Marina S.

doi:10.1016/j.inoche.2011.06.014

Cited by 8 publications

(3 citation statements)

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“…These findings were recently reported by some of us , and independently confirmed . Having been targeted at the hybrid polymeric materials with cumulative properties (luminescence and guest inclusion in our case), we have demonstrated the efficacy of the oxime/anion/aromatic amine ‘‘blend’’ approach , and succeeded in preparation of Zn(II) and Cd(II) mixed-ligand MOMs of different dimensionalities where the bulky classic dioximes or pyridine- n -aldoxime ( n = 2 for 2-pyao, n = 4 for 4-pyao) molecules act as auxiliary ligands whose coordination to the metal centers provides the loosely packed materials with the voids occupied (or might be potentially occupied) by small organic molecules. − ,,− The very limited crystallographic data available for MOMs with pyridine-4-oxime ligands (Scheme ) reveals the monodentate mode of 4-pyao coordination to the metal center via pyridine nitrogen. ,− …”

Section: Introductionsupporting

confidence: 84%

Mechanism of Nonlinear Optical Enhancement and Supramolecular Isomerism in 1D Polymeric Zn(II) and Cd(II) Sulfates with Pyridine-4-aldoxime Ligands

et al. 2014

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Interaction of zinc(II) and cadmium(II) sulfates with pyridine-4-aldoxime (4-pyao) and pyridine-4amidoxime (4-pyamo) ligands resulted in four 1D metal− organic materials (MOMs) with identical composition, [M(SO 4 )A 2 (H 2 O) 2 ] n , where M = Zn(II), A = 4-pyao for 1, M = Cd(II), A = 4-pyao for 2, M = Zn(II), A = 4-pyamo for 3, M = Cd(II), A = 4-pyamo for 4, and mononuclear [Zn(SO 4 )(4-pyamo) 2 (H 2 O) 3 ] 5. New coordination polymers represent the mixed-ligand supramolecular isomers different by the twisting of two pyridine-4-oxime ligands in the metal coordination environments, and crystallizing in the different space groups.Conformational preferences and nonlinear optical properties of the 4-pyao and 4-pyamo complexes were investigated using density functional theory. Spectral properties of 1−3 have been also evaluated. The solid-state emission of 1D polymers 1−3 appears to be ligand-based, as the positions of the emission maxima remain practically unchanged from free ligand to complexes. The enhancement of luminescence and twophoton absorption in polymers in comparison with the pure ligands is attributed to the chelation of the ligand to the metal center. The detailed mechanism of this enhancement upon complex formation is analyzed and can be used in future design of metal−organic nonlinear optical materials.

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Section: Introductionsupporting

confidence: 84%

Mechanism of Nonlinear Optical Enhancement and Supramolecular Isomerism in 1D Polymeric Zn(II) and Cd(II) Sulfates with Pyridine-4-aldoxime Ligands

et al. 2014

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“…The bond lengths of Zn-N and Zn-O are in the range of 2.033(5)-2.157(5) Å and 2.014(5)-2.024(5) Å, respectively, which are normal and comparable with those found in the literature. [17][18][19][20][21][22] The results of bond valence calculation show that all zinc ions are in the +2 oxidation state (Zn1: 2.102; Zn2: 2.064; Zn3: 2.085; Zn4: 2.094). 23 In complex 1, all 2,2′-biimidazole molecules act as bidentate ligands.…”

Section: Resultsmentioning

confidence: 99%

Preparation, Structure, Fluorescence and Tddft calculation of a Zinc Biimidazole Complex

Chen

Huang

Luo

et al. 2014

Journal of Chemical Research

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The complex [Zn(2,2'-biimidazole) 2 H 2 O] 4 (SO 4 )4·12H 2 O has been synthesised by solvothermal reaction and structurally characterised by single crystal X-ray diffraction. The zinc ion coordinates to four nitrogen atoms and one oxygen atom to yield a slightly distorted square pyramid. The [Zn(2,2'-biimidazole)2H 2 O] 2+ cations and SO 4 2anions link to each other by hydrogenbonding interactions to complete a three-dimensional supramolecular framework. The complex exhibits an emission in the blue region and theoretical investigation reveals that the emission mainly originates from ligand-to-ligand charge transfer, accompanied some ligand-to-metal charge transfer.

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“…The introduction of an oxime-containing auxiliary ligand, such as N-(pyridin-4-ylmethylidene)hydroxylamine (4-pyao), into the reaction system is expected to result in novel metalorganic frameworks. In our previous reports (Coropceanu et al, 2011(Coropceanu et al, , 2014, we used an acetate-pyridine-4-oxime 'blend approach' that resulted in new discrete coordination compounds, including mono-, bi-and tetranuclear clusters with oxime ligands. We concluded that pyridine-4-oxime molecules coordinate to the d 10 metals as neutral ligands, while the acetate anions demonstrate different coordination modes.…”

Section: Introductionmentioning

confidence: 99%

Two Zn^IImononuclear coordination compounds with pyridinedicarboxylate and auxiliaryN-(pyridin-4-ylmethylidene)hydroxylamine ligands

Coropceanu

Dreab

Croitor

2014

Acta Crystallogr C Struct Chem

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Two new mononuclear coordination compounds, bis{4-[(hydroxyimino)methyl]pyridinium} diaquabis(pyridine-2,5-dicarboxylato-κ(2)N,O(2))zincate(II), (C6H7N2O)2[Zn(C7H3NO4)2(H2O)2], (1), and (pyridine-2,6-dicarboxylato-κ(3)O(2),N,O(6))bis[N-(pyridin-4-ylmethylidene-κN)hydroxylamine]zinc(II), [Zn(C7H3NO4)(C6H6N2O)2], (2), have been synthesized and characterized by single-crystal X-ray diffractometry. The centrosymmetric Zn(II) cation in (1) is octahedrally coordinated by two chelating pyridine-2,5-dicarboxylate ligands and by two water molecules in a distorted octahedral geometry. In (2), the Zn(II) cation is coordinated by a tridentate pyridine-2,6-dicarboxylate dianion and by two N-(pyridin-4-ylmethylidene)hydroxylamine molecules in a distorted C2-symmetric trigonal bipyramidal coordination geometry.

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Unique tetranuclear heterometallic compound [Na2Zn2{(4-py)C(H)(NOH)}2(CH3COO)6(H2O)4].2H2O with luminescent properties

Cited by 8 publications

References 58 publications

Mechanism of Nonlinear Optical Enhancement and Supramolecular Isomerism in 1D Polymeric Zn(II) and Cd(II) Sulfates with Pyridine-4-aldoxime Ligands

Mechanism of Nonlinear Optical Enhancement and Supramolecular Isomerism in 1D Polymeric Zn(II) and Cd(II) Sulfates with Pyridine-4-aldoxime Ligands

Preparation, Structure, Fluorescence and Tddft calculation of a Zinc Biimidazole Complex

Two Zn^IImononuclear coordination compounds with pyridinedicarboxylate and auxiliaryN-(pyridin-4-ylmethylidene)hydroxylamine ligands

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Unique tetranuclear heterometallic compound [Na2Zn2{(4-py)C(H)(NOH)}2(CH3COO)6(H2O)4].2H2O with luminescent properties

Cited by 8 publications

References 58 publications

Mechanism of Nonlinear Optical Enhancement and Supramolecular Isomerism in 1D Polymeric Zn(II) and Cd(II) Sulfates with Pyridine-4-aldoxime Ligands

Mechanism of Nonlinear Optical Enhancement and Supramolecular Isomerism in 1D Polymeric Zn(II) and Cd(II) Sulfates with Pyridine-4-aldoxime Ligands

Preparation, Structure, Fluorescence and Tddft calculation of a Zinc Biimidazole Complex

Two ZnIImononuclear coordination compounds with pyridinedicarboxylate and auxiliaryN-(pyridin-4-ylmethylidene)hydroxylamine ligands

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Two Zn^IImononuclear coordination compounds with pyridinedicarboxylate and auxiliaryN-(pyridin-4-ylmethylidene)hydroxylamine ligands