Bis-tetradentate complexes of Cd(<scp>ii</scp>) and Hg(<scp>ii</scp>) with N<sub>8</sub>coordination: structural and NMR comparisons

Bowers, Edith V.; Murphy, Geoffrey S.; Till, Stephanie N.; VandenBussche, Christopher; Yaroschak, Melissa M.; Pike, Robert D.; Butcher, Raymond J.; Bebout, Deborah C.

doi:10.1039/c4dt02435d

Cited by 4 publications

(1 citation statement)

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“…The potentially toxic mercury compounds tend to bind to DNA and intervene with its native helices. The noxious metal, mercury is recognised to form coordinate complexes with molecules containing N and S binding sites, possessing a stronger affinity for S. [5][6][7][8] Such metal-organic coordination polymers have caught attention because of their intriguing structures and distinctive properties, which find applications in magnetism, sensing and so on. [9,10] Cadmium, non-essential heavy metal, is also identified to instigate DNA damage.…”

Section: Introductionmentioning

confidence: 99%

Crystal Engineering and Self‐Assembled Nanoring Formation with Purine‐Cd^II/Hg^II Supramolecular Frameworks

Avasthi,

Muthukumaran,

Prajapati

et al. 2024

Chemistry An Asian Journal

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We report three complexes of CdII and HgII with two purine rare tautomers, L1 and L2, highlighting diverse crystallographic signatures exhibited by them. Influence of substituents, binding sites, steric effects and metal salts on the different modes of binding enabled an insight into metal‐nucleobase interactions. L1 interacted with two and three equivalents of Cd(NO3)2.4H2O and HgCl2, respectively, while L2 interacted with two equivalents of HgCl2, altogether leading to three different complexes (1‐3) possessing varied dimensionality and stabilising interactions. The photoluminescent properties of these coordination frameworks have also been probed. Notably, nanoring‐like structures were obtained, as a result of self‐assembly of 3 when investigated by transmission electron microscopy, additionally supported by molecular dynamics simulations.

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Section: Introductionmentioning

confidence: 99%

Crystal Engineering and Self‐Assembled Nanoring Formation with Purine‐Cd^II/Hg^II Supramolecular Frameworks

Avasthi,

Muthukumaran,

Prajapati

et al. 2024

Chemistry An Asian Journal

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Group 12 complexes of 2,6-bis([(2-pyridinylmethyl)thio]methyl)pyridine: Synthesis and characterization by X-ray crystallography and proton NMR

et al. 2016

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New complexes [ZnL](ClO 4) 2 (1), [CdL(ClO 4)]ClO 4 (2) and [HgL](ClO 4) 2 (3) (L = 2,6bis([(2-pyridinylmethyl)thio]methyl)pyridine) were prepared and characterized by X-ray crystallography and variable temperature 1 H NMR. The ligand had an extended planar conformation when crystallized in pure form and a pentadentate corkscrew conformation with the terminal pyridyl nitrogen on either side of the plane formed by the other three donor atoms in the complexes. Nearly symmetric 1 and symmetric 3 had well separated perchlorates. In contrast, 2 had one bidentate perchlorate leading to a N 3 O 2 S 2 metal coordination sphere. Although rapid intermolecular exchange is common for Group 12 metal ion complexes of simple ligands, in dilute CD 3 CN solution slow intermolecular exchange conditions on the δ HH , J CdH and J HgH time scales were found for 1, 2 and 3, respectively, at 20 °C and intramolecular reorganization of bound L approached the slow exchange limit under cryogenic conditions.

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Contrasting coordination behavior of Group 12 perchlorate salts with an acyclic N₃O₂donor ligand by X-ray crystallography and¹H NMR

2016

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An unbranched N3O2 ligand 2,6-bis[((2-pyridinylmethyl)oxy)methyl]pyridine (L1) was used to prepare new mononuclear heteroleptic Group 12 perchlorate complexes characterized by IR, (1)H NMR and X-ray crystallography. Racemic complexes with pentadentate L1 and one to four oxygens from either water or perchlorate bound to a metal ion were structurally characterized. Octahedral [Zn(L1)(OH2)](ClO4)2 (1) and pentagonal bipyramidal [Cd(L1)(OH2)(OClO3)]ClO4 (2) structures were found with lighter congeners. The polymorphic forms of [Hg(L1)(ClO4)2] characterized (3 in P1[combining macron] and 4 in P21/c) had a mix of monodentate, anisobidentate and bidentate perchlorates, providing the first examples of a tricapped trigonal prismatic Hg(ii) coordination geometry, as well as additional examples of a rare square antiprismatic Hg(ii) coordination geometry. Solution state (1)H NMR characterization of the Group 12 complexes in CD3CN indicated intramolecular reorganization remained rapid under conditions where intermolecular M-L1 exchange was slow on the chemical shift time scale for Zn(ii) and on the J(M(1)H) time scale for Cd(ii) and Hg(ii). Solution studies with more than one equivalent of ligand also suggested that a complex with a 1 : 2 ratio of M : L1 contributed significantly to solution equilibria with Hg(ii) but not the other metal ions. The behavior of related linear pentadentate ligands with Group 12 perchlorate salts is discussed.

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Bis-tetradentate complexes of Cd(ii) and Hg(ii) with N₈coordination: structural and NMR comparisons

Cited by 4 publications

References 45 publications

Crystal Engineering and Self‐Assembled Nanoring Formation with Purine‐Cd^II/Hg^II Supramolecular Frameworks

Crystal Engineering and Self‐Assembled Nanoring Formation with Purine‐Cd^II/Hg^II Supramolecular Frameworks

Group 12 complexes of 2,6-bis([(2-pyridinylmethyl)thio]methyl)pyridine: Synthesis and characterization by X-ray crystallography and proton NMR

Contrasting coordination behavior of Group 12 perchlorate salts with an acyclic N₃O₂donor ligand by X-ray crystallography and¹H NMR

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Bis-tetradentate complexes of Cd(ii) and Hg(ii) with N8coordination: structural and NMR comparisons

Cited by 4 publications

References 45 publications

Crystal Engineering and Self‐Assembled Nanoring Formation with Purine‐CdII/HgII Supramolecular Frameworks

Crystal Engineering and Self‐Assembled Nanoring Formation with Purine‐CdII/HgII Supramolecular Frameworks

Group 12 complexes of 2,6-bis([(2-pyridinylmethyl)thio]methyl)pyridine: Synthesis and characterization by X-ray crystallography and proton NMR

Contrasting coordination behavior of Group 12 perchlorate salts with an acyclic N3O2donor ligand by X-ray crystallography and1H NMR

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Bis-tetradentate complexes of Cd(ii) and Hg(ii) with N₈coordination: structural and NMR comparisons

Crystal Engineering and Self‐Assembled Nanoring Formation with Purine‐Cd^II/Hg^II Supramolecular Frameworks

Crystal Engineering and Self‐Assembled Nanoring Formation with Purine‐Cd^II/Hg^II Supramolecular Frameworks

Contrasting coordination behavior of Group 12 perchlorate salts with an acyclic N₃O₂donor ligand by X-ray crystallography and¹H NMR