From discrete metallacycle, cage to infinite chain: tuning the coordination frameworks by variation of the metal center or ligand functionality

Du, Miao; Zhao, Xiaojun; Guo, Jian‐Hua

doi:10.1016/j.inoche.2004.10.011

Cited by 14 publications

(1 citation statement)

References 19 publications

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“…For these cocrystalline materials, the primary strong O−H···N and the auxiliary weak C−H···O hydrogen-bonding interactions between the carboxylic and pyridyl groups usually afford 1-D linear, zigzag, or helical infinite arrays. Combining with other weak C−H···O and/or C−H···N interactions, such heterosynthons extend the supramolecular architectures to higher dimensions as compared with the cases utilizing linear dipyridyl derivatives as the building blocks, 6b-d, which is attributed to the multiple hydrogen-bonding sites and relatively flexible conformation of bpo . On the other hand, flexible alkyl carboxylic acids have also been applied in similar assemblies; for example, the 1,2-disubstituted fumaric acid was used to cocrystallize with 4,4‘-bipyridine derivatives .…”

Section: Introductionmentioning

confidence: 99%

Synthons Competition/Prediction in Cocrystallization of Flexible Dicarboxylic Acids with Bent Dipyridines

Zhang

Zhao

et al. 2005

Crystal Growth & Design

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On the basis of the primary carboxyl/pyridyl hydrogen-bonded synthon, 2,5-bis(3-pyridyl)-1,3,4-oxadiazole (3-bpo) and its 4-N-donor isomer 2,5-bis(4-pyridyl)-1,3,4-oxadiazole (4-bpo) were assembled with flexible dicarboxylic acids possessing variable chain lengths to afford a series of organic cocrystalline materials. [Fumaric acid]‚[3-bpo] (1) has a two-dimensional (2-D) layered supramolecular pattern. [Fumaric acid]‚[4-bpo] (2) has linear tapes connected via carboxyl/pyridyl heterosynthons and further creates a three-dimensional (3-D) square net with the CdSO 4 topology combining with other weak interactions. [Suberic acid]‚[3-bpo] (3), obtained in ambient conditions, exhibits a 3-D corrugated network; however, [suberic acid]‚[4-bph] (4), produced unexpectedly by hydrothermal synthesis, displays a 3-D framework expanding from 2-D layers, in which N,N′-bis(4-picolinoyl) hydrazine (4-bph) is generated in situ from the hydrolysis of 4-bpo. [Benzene-1,4-dioxyacetic acid]‚[3-bpo] (5) takes on a nearly planar 2-D sheet, while [benzene-1,4-dioxyacetic acid]‚[4-bpo] (6) presents an unusual bilayered structure. For all binary compounds except 1, the acid-base components are connected by the carboxyl/pyridyl heterosynthon [O-H‚‚‚N and C-H‚‚‚O, R 2 2 ( 7)], which has been well exploited to engineer plenty of ordered crystalline architectures, to generate linear or zigzag tapes. Via subsidiary C-H‚‚‚O and/or N-H‚‚‚O (only for 4) hydrogen bonds between the neighboring tapes, these 1-D arrays are further extended to diverse networks from 2-D to 3-D. The similarities/differences between the hydrogen-bonded motifs of the cocrystals based on the flexible (alkyl) and rigid (aromatic) dicarboxylic acids with the same bent dipyridyl bases are also discussed, which may further enhance the crystal engineering of organic solids.

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Section: Introductionmentioning

confidence: 99%

Synthons Competition/Prediction in Cocrystallization of Flexible Dicarboxylic Acids with Bent Dipyridines

Zhang

Zhao

et al. 2005

Crystal Growth & Design

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Coordination Assemblies of Metallacyclic, Prismatic and Tubular Molecular Architectures Based on the Non‐rigid Ligands

2007

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(1,3,4‐Oxadiazole)copper(II) Compounds: Dimensionality, Magnetism and Nuclease Activity

et al. 2009

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The work presented here describes the synthesis of new copper(II) complexes derived from 2-amino-5-(pyridin-2-yl)-1,3,4-oxadiazole (L 1 ) and 2-methylamino-5-(pyridin-2-yl)-compounds show the dependence of the dimensionality on parameters such as the type of oxadiazole and coligand utilised, solvents or reaction times. In this sense, 1 and 3 are mononuclear complexes, 2 contains centrosymmetric dinuclear entities, 4 is a 1D compound in which thiocyanato groups act as end-to-end bridges and 5 shows a 2D arrangement of dinuclear motifs linked through dicyanamido spacers. The copper(II) ions acquire distorted octahedral (3 and 4), square-pyramidal (1 and 2) and trigonal bipyramidal (5) geometries. Stacking π-π interactions and hydrogen bonds stabilise the crystal frameworks. Water tetramers are present in 1. Spectroscopic (infrared, UV/Vis absorption and electron spin resonance) studies have also been developed

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From discrete metallacycle, cage to infinite chain: tuning the coordination frameworks by variation of the metal center or ligand functionality

Cited by 14 publications

References 19 publications

Synthons Competition/Prediction in Cocrystallization of Flexible Dicarboxylic Acids with Bent Dipyridines

Synthons Competition/Prediction in Cocrystallization of Flexible Dicarboxylic Acids with Bent Dipyridines

Coordination Assemblies of Metallacyclic, Prismatic and Tubular Molecular Architectures Based on the Non‐rigid Ligands

(1,3,4‐Oxadiazole)copper(II) Compounds: Dimensionality, Magnetism and Nuclease Activity

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