New multidentate ligands for supramolecular coordination chemistry: double and triple helical complexes of ligands containing pyridyl and thiazolyl donor units
Abstract:Four new multidentate N-donor ligands L 1 -L 4 have been prepared which contain a combination of pyridyl and thiazolyl donor units. The syntheses of these ligands are facile and high-yielding, being based on reaction of an α-bromoacetyl unit with a thioamide to form the thiazolyl ring. The extended linear sequence of ortho-linked N-donor heterocycles (four for L 1 , six for L 2 ; five for L 3 ; and six for L 4 ) is reminiscent of the well-known linear oligopyridines, although these new ligands are much easier … Show more
“…These ligands are all tetradentate, and accordingly, reaction with metal cations that prefer an octahedral coordination geometry requires 1.5 ligands per metal ion to provide the necessary six donor atoms (assuming that noncoordinating anions are used). The simplest stoichiometry that can occur is therefore M 2 L 3 , as commonly found in dinuclear triple helicates based on octahedral metal ions and bis-bidentate bridging ligands [19,20]. (Fig.…”
Section: Open-chain Dinuclear and Tetrahedral Cage Complexes With L 1mentioning
“…These ligands are all tetradentate, and accordingly, reaction with metal cations that prefer an octahedral coordination geometry requires 1.5 ligands per metal ion to provide the necessary six donor atoms (assuming that noncoordinating anions are used). The simplest stoichiometry that can occur is therefore M 2 L 3 , as commonly found in dinuclear triple helicates based on octahedral metal ions and bis-bidentate bridging ligands [19,20]. (Fig.…”
Section: Open-chain Dinuclear and Tetrahedral Cage Complexes With L 1mentioning
Eine Totalsynthese des bismakrocyclischen Thiopeptidantibiotikums Nosiheptid gelang durch den Aufbau einer voll funktionalisierten linearen Vorstufe und konsekutive Makrocyclisierungen. Schlüsselmerkmale waren eine kritische Makrothiolactonisierung und eine milde Entschützungsstrategie für den 3‐Hydroxypyridin‐Kern. Der Naturstoff war mit isoliertem authentischem Material im Hinblick auf spektroskopische Daten und antimikrobielle Aktivität identisch.
“…Each Fe(II) center displays a distorted octahedral coordination geometry, being coordinated by two nitrogen atoms of one phen ligand and four oxygen atoms from three different carboxylate groups of three ipt ligands. The average Fe-N bond length is 2.1891 (19) A A, and the Fe-O bond lengths vary from 2.0469(15) to 2.3182 (14) A A. The ipt ligand exhibits an interesting connection mode with metal ions.…”
mentioning
confidence: 98%
“…This is because the nonlinear flexible or V-shaped dicarboxylate ligands can produce the helicity or flexuosity of the polymeric chains and aromatic bidentate chelate ligands can prevent the forming of high dimensional expanded structure [16,17] and provide potential supramolecular recognition for intermolecular p-p stacking interaction [18,19]. Based on the above synthesis strategy, we choose V-shaped dicarboxylate ligand ipt, bidentate chelate ligand phen and metal ion with appropriate geometry as the study system to explore potential charming helical structures.…”
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