A dinucleating quinquepyridine analogue

Dong, Gordon; Baker, Anthony T.; Craig, Donald C.

doi:10.1016/0020-1693(94)04342-s

Cited by 10 publications

(4 citation statements)

References 14 publications

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“…The Cu−N bond lengths are typical for copper(I) centers bound by nitrogen heterocycles . The “bite angle” (N−Cu−N) for the pyridinylpyrazole didentate fragments are usual for relatively rigid didentate α-diimine ligands, and the values are very similar to the bite angles (79.6(3) and 79.5(2)°) found in the copper(II) complex of L‘, the unsubstituted analog of L …”

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confidence: 52%

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A Trinuclear Double-Helical Metal Complex of a Quinquepyridine Analog

1996

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A double-helical metal complex of an oligopyridine analog (i.e. with heterocycles other than pyridinyl rings) has been fully structurally characterized. This complex is the first example of a trinuclear double-helical complex containing quinquedentate and monodentate ligands and is of a type that has not been observed with the oligopyridines. In the rhetoric of metallosupramolecular chemistry much is said about the “design” of complexes of specific structure. Our work invites molecular engineers to consider pyrazolyl ligands as useful additions to their “tool kit”.

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confidence: 52%

“…We recently reported the structure of a copper(II) complex of the unsubstituted analog of L, 2,6-bis(1-(pyridin-2-yl)pyrazol-3-yl)pyridine (L‘), in which each unit of the dimeric complex is dinuclear. In the copper(II) complex of L‘, the ligand binds each metal center employing a pyridinylpyrazole fragment and remains essentially planar.…”

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confidence: 99%

A Trinuclear Double-Helical Metal Complex of a Quinquepyridine Analog

1996

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“…Compound 14 takes part in complexation with the Cu(II) ion as a bisbidentate ligand, used for binding the nitrogen atoms of the pyrazoles and the terminal pyridines with the metal ions [16]. In the case of the complex with Co(II) compound 14 represents a tridentate ligand, which bonds with the metal through the nitrogen atoms of the pyrazoles and the central pyridine ring [17].…”

Section: Pyrazolesmentioning

confidence: 99%

“…An interesting polydentate analog of compound 1 is the ligand 14, produced by arylation of the dianion of 2,6-di(3-pyrazolyl)pyridine [16].…”

Section: Pyrazolesmentioning

confidence: 99%

Synthesis of Azoles with Two Pyridine Substituents at Carbon Atoms and Their Use in Coordination Chemistry. (Review)

Вацадзе

Nuriev

Зык

2005

Chem Heterocycl Compd

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Published data on the synthesis of azoles containing two pyridine substituents are analyzed in relation to the type of central five-membered ring. The applications of such molecules as ligands in coordination chemistry are discussed.The design of coordination polymers having unique structures and valuable functional characteristics is one of the most rapidly developing regions of modern chemistry and materials science [1,2]. Most of the employed exo-dentate ligands belong to the bipyridine class with the general formula Py-X-Py, where X is a conjugated disubstituted fragment. The parent of such ligands is 4,4'-bipyridine (X is absent), which has been widely used for a long time in the construction of coordination polymers [3]. The most widely used bridges X include double and triple carbon-carbon bonds, azo and imino groups, and benzene, pyridine, triazine, and tetrazine rings or combinations of these fragments [4].One modern trend in the synthesis of coordination polymers is to use ligands of the Py-X-Py type, where X is a meta-or ortho-substituted azole. The interest in such compounds is due, first, to their electronic characteristics and, second, to the ability of the pyridine nitrogen atom of the azole ring to coordinate with the metal ion. This fact significantly extends the possibilities of the ligands in coordination, enhancing the practical characteristics of the complexes. At the moment the coordination characteristics of a small group of dipyridylazoles have been studied. It is important to emphasize that at this time there has been no systematic treatment of data on the design and synthesis of such compounds. In view of the foregoing it seemed to us important and timely to clarify some of the problems that arise in the synthesis of dipyridylazoles for the systems that are finding use in coordination chemistry.It should be noted that in this paper we restrict ourselves to examination of the synthesis and coordination characteristics of azoles containing not less than one nitrogen atom of the pyridine type. Consequently, we do not consider five-membered donating heterocycles with one heteroatom. The second restriction is the fact that we decided to examine only azoles substituted by pyridine groups at carbon atoms, and the range of compounds studied does not therefore include tetrazoles.The review is divided up according to the types of central five-membered heterocycles. In each section the synthetic aspects and questions concerning the use of specific ligands in coordination chemistry are examined. _______ * Dedicated to Academician Nikolai Serafimovich Zefirov in honor of his seventieth birthday. __________________________________________________________________________________________

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Di‐Iron(II) [2+2] Helicates of Bis‐(Dipyrazolylpyridine) Ligands: The Influence of the Ligand Linker Group on Spin State Properties

Kulmaczewski

Armstrong

Catchpole

et al. 2022

Chemistry A European J

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Four bis[2‐{pyrazol‐1‐yl}‐6‐{pyrazol‐3‐yl}pyridine] ligands have been synthesized, with butane‐1,4‐diyl (L1), pyrid‐2,6‐diyl (L2), benzene‐1,2‐dimethylenyl (L3) and propane‐1,3‐diyl (L4) linkers between the tridentate metal‐binding domains. L1 and L2 form [Fe2(μ−L)2]X4 (X−=BF4− or ClO4−) helicate complexes when treated with the appropriate iron(II) precursor. Solvate crystals of [Fe2(μ−L1)2][BF4]4 exhibit three different helicate conformations, which differ in the torsions of their butanediyl linker groups. The solvates exhibit gradual thermal spin‐crossover, with examples of stepwise switching and partial spin‐crossover to a low‐temperature mixed‐spin form. Salts of [Fe2(μ−L2)2]4+ are high‐spin, which reflects their highly twisted iron coordination geometry. The composition and dynamics of assembly structures formed by iron(II) with L1−L3 vary with the ligand linker group, by mass spectrometry and 1H NMR spectroscopy. Gas‐phase DFT calculations imply the butanediyl linker conformation in [Fe2(μ−L1)2]4+ influences its spin state properties, but show anomalies attributed to intramolecular electrostatic repulsion between the iron atoms.

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A dinucleating quinquepyridine analogue

Cited by 10 publications

References 14 publications

A Trinuclear Double-Helical Metal Complex of a Quinquepyridine Analog

A Trinuclear Double-Helical Metal Complex of a Quinquepyridine Analog

Synthesis of Azoles with Two Pyridine Substituents at Carbon Atoms and Their Use in Coordination Chemistry. (Review)

Di‐Iron(II) [2+2] Helicates of Bis‐(Dipyrazolylpyridine) Ligands: The Influence of the Ligand Linker Group on Spin State Properties

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