Supramolecular isomerism in coordination polymers

Zhang, Wei‐Xiong; Huang, Xiao‐Chun; Chen, Xiaoming

doi:10.1039/b900317g

Cited by 568 publications

(299 citation statements)

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“…Although this type of structure has been reported recently by other groups, the reported compounds have no Cl or Br ion in contrast to our present compound 1 and 2. 7 In our compounds, four water molecules and two X ions locate at six axial coordination 85 positions of three copper ions of a triangular unit with random disordering at all temperatures investigated. Other two water molecules exist in the space of three-dimensional network as crystal water, which was also confirmed by TG/DTA.…”

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confidence: 81%

Reversible solid-state structural conversion between a three-dimensional network and a one-dimensional chain of Cu(ii) triazole coordination polymers in acidic/basic-suspensions or vapors

2011

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New Cu(II) triazole coordination polymers with 3D network were synthesized and reversible structural conversion between 3D network and 1D chain with color change was realized by pH 10 controlled acidic and basic-suspensions or vapors. For each conversion process of decreasing and increasing pH, conversion was accomplished with high yield, in which the crystal before conversion played a role of a solid state crystal template.A lot of metal-organic frameworks (MOFs) and metal 15 coordination polymers (MCPs) with characteristic physical properties have been synthesized and relation between their structures and functional properties has been studied. 1 The functional ability of MOF and MCP is sensitive to their structures. Therefore, a drastic structural conversion of MOF 20 and MCP based on the original crystal structure as a template is one of the challenging strategies to control their structures and physical properties. Only a few structural transformations with external stimuli such as temperature, pH or photoirradiation without dissolution was reported in recent years. 2 25Here we report in this paper new coordination polymers [Cu 3 (trz) 3 ( 3 -OH)]X 2 ·6H 2 O (X = Cl, Br, trz = triazolate), which could be transformed in the solid state from threedimensional coordination network to one-dimensional chain structure under acidic condition. The present copper metal 30 coordination polymers are almost insoluble in water and thus convenient to study structural conversion in the solid state. A pronounced character of [Cu 3 (trz) 3 ( 3 -OH)]X 2 ·6H 2 O is having 1,2,4-triazole as ligands. 1,2,4-triazole is known as a useful ligand for constructing a variety of MOFs and MCPs. 3,4 35 This ligand has two different coordination modes depending on its protonation. One is to act as anionic triazolate (trz) ligand which forms tridentate coordination to a metal ion and the other is to act as neutral triazole (H-trz) ligand which constructs bidentate coordination to a metal ion. 4,5 Protonation 40 of trz can be controlled by pH. Since pKa of H-trz is 2.2, trz is dominant at higher pH and H-trz is dominant at lower pH as shown in Scheme 1. 6 These two possible coordination modes make one structure of MCPs transform largely to another structure depending on external condition of pH. Structural 45 conversions, which are induced by pH stimuli and based on the original structure as a template, are presented in this paper.Powder Fig. 1 and Fig. S1 in ESI. Although this type of structure has been reported recently by other groups, the reported compounds have no Cl or Br ion in contrast to our present compound 1 and 2. 7 In our compounds, four water molecules and two X ions locate at six axial coordination 85 positions of three copper ions of a triangular unit with random disordering at all temperatures investigated. Other two water molecules exist in the space of three-dimensional network as crystal water, which was also confirmed by TG/DTA. For 1 and 2, rest nitrogen atom of each trz of triangular unit 90 coordinates to ...

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confidence: 81%

Reversible solid-state structural conversion between a three-dimensional network and a one-dimensional chain of Cu(ii) triazole coordination polymers in acidic/basic-suspensions or vapors

2011

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“…[1][2][3][4][5][6][7] In the latter case, ligands possessing more than one coordination site have the potential to link a number of metal atoms. These bridging ligands have attracted a significant degree of attention in recent years because they enable the formation of multinuclear metallosupramolecular assemblies [3,8,9] or coordination polymers [10][11][12][13][14][15][16][17] with desirable structures and properties. Within such bridging ligands the additional stabilising effect of chelation to multiple metal atoms can be achieved through incorporation of bidentate donor groups that form either a five-or six-membered chelate ring with each coordinated metal centre (Figure 1a).…”

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confidence: 99%

Bridging ligands comprising two or more di-2-pyridylmethyl or amine arms: Alternatives to 2,2′-bipyridyl-containing bridging ligands

Sumby

2011

Coordination Chemistry Reviews

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“…In helical, arched and zigzag chains, the M:L ratio is 1:1 as it is in M 2 L 2 macrocycles. If these structures are formed from the same metal units and dtdp, they can be viewed as supramolecular isomers [39,40]. There appears to be no strict definition of this term either and hence we think some explanation is necessary.…”

Section: Structural Classificationmentioning

confidence: 99%

Structural Diversity of Metallosupramolecular Assemblies Based on the Bent Bridging Ligand 4,4′-Dithiodipyridine

2013

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4,4′-Dithiodipyridine (dtdp), also termed 4,4′-dipyridyldisulfide, is a bridging ligand of the 4,4′-bipyridine type. The introduction of the disulfide moiety inevitably leads to a relatively rigid angular structure, which exhibits axial chirality. More than 90 metal complexes containing the dtdp ligand have been crystallographically characterised until now. This review focuses on the preparation and structural diversity of discrete and polymeric metallosupramolecular assemblies constructed from dtdp as bridging ligands. These encompass metallamacrocycles with M 2 L 2 topology and coordination polymers with periodicity in one or two dimensions. One-dimensional coordination polymers represent the vast majority of the metallosupramolecular structures obtained from dtdp. These include repeated rhomboids, zigzag, helical and arched chains among other types. In this contribution, we make an attempt to provide a comprehensive account of the structural data that are currently available for metallosupramolecular assemblies based on the bent bridging ligand dtdp. OPEN ACCESSPolymers 2013, 5 528

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Supramolecular isomerism in coordination polymers

Cited by 568 publications

References 96 publications

Reversible solid-state structural conversion between a three-dimensional network and a one-dimensional chain of Cu(ii) triazole coordination polymers in acidic/basic-suspensions or vapors

Reversible solid-state structural conversion between a three-dimensional network and a one-dimensional chain of Cu(ii) triazole coordination polymers in acidic/basic-suspensions or vapors

Bridging ligands comprising two or more di-2-pyridylmethyl or amine arms: Alternatives to 2,2′-bipyridyl-containing bridging ligands

Structural Diversity of Metallosupramolecular Assemblies Based on the Bent Bridging Ligand 4,4′-Dithiodipyridine

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