Self-assembled mononuclear palladium(II) based molecular loops

Sahoo, Himansu Sekhar; Tripathy, Debakanta; Chakrabortty, Sabyasachi; Bhat, Satish S.; Kumbhar, Avinash S.; Chand, Dillip Kumar

doi:10.1016/j.ica.2013.02.015

Cited by 15 publications

(12 citation statements)

References 39 publications

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“…The reaction of cis ‐[Pd(tmeda)(NO 3 ) 2 ] with L in a ratio of 1:1 is a suitable stoichiometry for the preparation of a mononuclear self‐assembled complex with a large chelate ring. In the mononuclear complex, the terminal pyridine nitrogen lone pairs are expected to participate in metal–ligand bond formation.…”

Section: Resultsmentioning

confidence: 99%

“…The precipitation method was used to isolate the desired products, through the addition of excess EtOAc. Although the “spiro”‐type mononuclear product [Pd( L ) 2 ](NO 3 ) 2 ( 3a ) was isolated from the reaction carried out with a 1:2 ratio of metal to ligand (Scheme , a), the “double‐decker”‐type trinuclear product [Pd 3 ( L ) 4 ](NO 3 ) 6 ( 4a ) was formed with a 3:4 ratio of the reagents (Scheme , b). Thus, in this latter case the internal pyridine participates in the reaction of L with Pd(NO 3 ) 2 to give the very symmetrical double‐decker cage‐like architecture 4a (Scheme ).…”

Section: Resultsmentioning

confidence: 99%

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Double‐Decker Coordination Cages

et al. 2016

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Bis(pyridin‐3‐ylmethyl) pyridine‐3,5‐dicarboxylate (L) possessing one internal and two terminal pyridine moieties displayed differential coordination ability when combined with suitable PdII components. The compound L acted as a bidentate chelating ligand to form mononuclear complexes when combined with cis‐[Pd(tmeda)(NO3)2] or Pd(NO3)2 in calculated ratios. The combination of Pd(NO3)2 with L in a ratio of 3:4, however, afforded the trinuclear “double‐decker” cage [(NO3)2⊂Pd3(L)4](NO3)4, in which L acts as a nonchelating tridentate ligand and the counter anion (i.e., NO3–) acts as template. The encapsulated NO3– can be replaced by F–, Cl–, or Br– but not by I–. The F–‐encapsulated cage could not be isolated due to its reactivity, whereas the Cl– or Br– encapsulated cages could be isolated. Although anionic guests such as NO3–, Cl–, or Br– stabilized the cages, the presence of excess Cl– or Br– (not NO3–) facilitated decomplexation reactions releasing the ligand. The complexation of Pd(Y)2 (Y = BF4–, PF6–, CF3SO3–, or ClO4–) with L afforded the corresponding mononuclear complexes under appropriate conditions. However, these counter anions could not act as templates for the construction of double‐decker cages.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Double‐Decker Coordination Cages

et al. 2016

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“…The electrophoretic mobility experiments were carried out by agarose gel electrophoresis [38][39][40] (11) photographed for analysis using the Alpha Innotech Gel documentation system (AlphaImager 2200).…”

Section: Electrophoretic Mobility Studymentioning

confidence: 99%

Synthesis, crystal structure and cytotoxicity studies of cis-dichloro(4,5-diazafluoren-9-one)platinum(II)

Biju

Rajasekharan

Bhat

et al. 2014

Inorganica Chimica Acta

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“…First, the overall topology of the metallo‐loop, defined in part by the naphthalene moiety collapsing onto the coordination unit, may block intercalation into duplex DNA, thereby affording the relatively good selectivity for G4 over duplex DNA, an observation that was also independently confirmed by a competition assay between F21T and an unlabelled ds26 hairpin duplex (Figure ; little loss of selectivity even in the presence of 250 equivalents of duplex architecture relative to G4). This contrasts sharply with the duplex‐binding behaviour of the partially planar palladium(II) metallo‐loops developed by Chand and coworkers, which offer similar interaction sites within their coordination units (electro‐deficient pyridine chelates connected via ethylene oxide units across from an ancillary 6,6’‐bipyridine or phenanthroline unit) incorporated into very different overall topologies …”

Section: Resultsmentioning

confidence: 99%

Closing the Loop: Triazolylpyridine Coordination Drives the Self‐Assembly of Metallomacrocycles with Tunable Topologies for Small‐Molecule and Guanine‐Quadruplex Recognition

Miron

Leung

Kennedy

et al. 2018

Chemistry A European J

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The 2‐(1,2,3‐triazol‐4‐yl)pyridine motif, with its facile “click” synthesis and remarkable coordinative properties, is an attractive chelate for applications in the metal‐directed self‐assembly of intricate three‐dimensional structures. Organic ligands that bear two such chelates bridged by flexible hinge moieties readily undergo self‐assembly with metal ions of different coordination geometries to generate a series of topologically diverse metallomacrocycles that can be used for numerous applications. Herein, the synthesis and self‐assembly of one such ligand with zinc(II), copper(II), and palladium(II) ions is reported, and the stability of the resulting metallomacrocycles described. An investigation into the use of these metallomacrocycles for the recognition of both small‐molecule substrates, such as deoxyguanosine monophosphate, and larger biological assemblies, such as DNA and RNA guanine quadruplexes, is also described.

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Self-assembled mononuclear palladium(II) based molecular loops

Cited by 15 publications

References 39 publications

Double‐Decker Coordination Cages

Double‐Decker Coordination Cages

Synthesis, crystal structure and cytotoxicity studies of cis-dichloro(4,5-diazafluoren-9-one)platinum(II)

Closing the Loop: Triazolylpyridine Coordination Drives the Self‐Assembly of Metallomacrocycles with Tunable Topologies for Small‐Molecule and Guanine‐Quadruplex Recognition

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