Influence of ligand substituent on structural assembly and coordination geometry

Khavasi, Hamid Reza; Barforoush, Maryam Mehdizadeh; Fard, Mahmood Azizpoor

doi:10.1039/c2ce25898f

Cited by 27 publications

(3 citation statements)

References 67 publications

(6 reference statements)

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“…The crystal is a 3D pseudo-diamond-type coordination network, resulting from the interconnection of consecutive tectons 4 by pseudorectangular Hg 4 N 4 S 4 Cl 8 complexes. The distance between Hg 2+ cations within the tetranuclear unit of 4.225(4) Å is close to those reported for similar neutral Hg n Cl 2 n species . The organic tecton 4 , in marked contrast with tectons 2 and 3 , which behave as tetradentate units, acts as a hexadentate N 4 S 2 neutral connector.…”

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confidence: 82%

“…The distance between Hg 2+ cations within the tetranuclear unit of 4.225(4) Å is close to those reported for similar neutral Hg n Cl 2n species. 25 The organic tecton 4, in marked contrast with tectons 2 and 3, which behave as tetradentate units, acts as a hexadentate N 4 S 2 neutral connector. The latter offers two monodentate pyridyl sites and two chelates of the NCCH 2 S type.…”

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confidence: 99%

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Molecular Tectonics: Control of the Dimensionality in Tetramercaptothiacalixarenes Based Coordination Networks

et al. 2013

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confidence: 82%

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confidence: 99%

Molecular Tectonics: Control of the Dimensionality in Tetramercaptothiacalixarenes Based Coordination Networks

et al. 2013

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“…During our research program aiming at the understanding of the role of intermolecular interactions in the crystal packing of mercury coordination compounds containing pyrazine carboxamide ligands, − we have synthesized, characterized, and investigated a series of designed complexes in the present work, in order to gain a deeper understanding on the crucial role of fluorine-involved interactions in the supramolecular architecture of coordination compounds including fluorinated ligands. In this article, a series of N -(fluorinatedphenyl)-2-pyrazinecarboxamide ligands, L 2‑F , L 2,5‑F , L 3‑F , L 2,3,4‑F , L 3,4,5‑F , L 2,3,4,5‑F , and L 2,6‑F , Scheme , carrying fluorine atoms on the phenyl ring, have been employed for the synthesis of six isostructural two-dimensional polymeric mercury(II) coordination complexes 1 – 6 and a discrete complex 7 , in order to get insights into the investigation of fluorine-involved interactions on the structural assemblies.…”

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Coordination Polymers with Intramolecular Fluorine-Involved Contacts in Two-Dimensional Sheet Windows

Khavasi

Rahimi

2017

Crystal Growth & Design

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5, and [Hg(L 2,3,4, ) 2 ] n , 6 and a discrete complex of [Hg(L 2,6-F ) 2 ], 7, in which L n-F ligands are N-(fluorinatedphenyl)-2pyrazinecarboxamides carrying fluorine atoms on the different positions of phenyl ring, have been synthesized and characterized. The crystal structures from X-ray diffraction reveal that all polymeric complexes have similar two-dimensional (2D) sheet windows. From a topological perspective, each metal atom can be viewed as 4-connected nodes and L n-F ligands can be considered as linkers in the formation of these 2D windows. Because of the flexibility of the ligand, fluorinated-phenyl rings as hanging groups in the windows are pointed toward the adjacent groups to generate different fluorine-involved intramolecular interactions. One of the common features in the crystal structures of these complexes is the presence of a strong tendency to form intramolecular F•••π interactions in 2D windows of the crystal structure of all polymeric complexes, except complex 3. These interactions are cooperating with weak C−H•••F and C−H•••O hydrogen bonds. Also, in the crystal structure of complexes 5 and 6, carrying three and four fluorine atoms on phenyl rings, type II F•••F synthons between adjacent rings have been observed in cooperation with F•••π interactions. Hirshfeld surface analysis also confirms that the F•••F/π contacts are predominant.

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Fluorine‐Substituted Ligands Induce Structural Diversity of Coordination Compounds

Khavasi

Rahimi

2017

ChemistrySelect

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Seven inorganic coordination compounds based on HgBr2 and Ln−F ligands, in which Ln−F are N‐(fluorinated phenyl)‐2‐pyrazinecarboxamide, bearing fluorine substituent in different position on phenyl ring have been synthesized. These complexes, [HgBr2(L2−F)2]n, 1, [HgBr2L3−F]n, 2, [HgBr2L4−F]n, 3, [HgBr2L2,5−F]n, 4, [HgBr2(L2,6−F)2], 5, [HgBr2L2,3,4−F], 6, and [HgBr2L2,3,4,5−F]n, 7, are characterized in order to get precise insight into the fluorine substituent effect on the coordination structures. The crystal structure data resulting from X‐ray diffraction reveal that, in spite of the same metal, counter ion and reaction conditions, overall structural diversity is evident in all cases. Accordingly, fluorinated ligand exercise influence on not only first coordination sphere but also supramolecular architecture and overall construction. As a matter of fact, small changes in the position and number of fluorine existed on the phenyl ring direct both first and second coordination sphere around metal ion.

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Influence of ligand substituent on structural assembly and coordination geometry

Cited by 27 publications

References 67 publications

Molecular Tectonics: Control of the Dimensionality in Tetramercaptothiacalixarenes Based Coordination Networks

Molecular Tectonics: Control of the Dimensionality in Tetramercaptothiacalixarenes Based Coordination Networks

Coordination Polymers with Intramolecular Fluorine-Involved Contacts in Two-Dimensional Sheet Windows

Fluorine‐Substituted Ligands Induce Structural Diversity of Coordination Compounds

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