نتایج جستجو برای: Macrocycle

تعداد نتایج: 1399  

Journal: :Organic letters 2008
Jeremiah J Gassensmith Lorna Barr Jeffrey M Baumes Agelina Paek Anh Nguyen Bradley D Smith

Pseudorotaxane complexes of squaraine dyes and tetralactam macrocycles are converted into permanently interlocked rotaxane structures using copper-catalyzed and copper-free cycloaddition reactions with bulky stopper groups. The photophysical properties of the encapsulated squaraine depend on the structure of the macrocycle. In one case, squaraine rotaxanes are produced in near-quantitative yiel...

2010
Cheng-Jun Hao Yan-Hua Zhang

The asymmetric unit of the title compound, C(22)H(42)N(6)·2CH(4)O, comprises one half of a 14-membered tetra-azacyclo-tetra-decane macrocycle with cyano-ethyl substituents on one of the N atoms and a methanol solvent mol-ecule. The macrocycle lies about an inversion centre. The cyano-ethyl substituents are oriented so that the cyano groups lie over opposite faces of the central cavity of the ma...

Journal: :Chemical science 2015
P Waelès C Clavel K Fournel-Marotte F Coutrot

We report a diverted route to [1]rotaxane and tris-branched [1]rotaxane that are devoid of any efficient template and which could not be obtained by classical straightforward strategies. The described chemical route relies on the utilization of a "macrocycle transporter", which is able first to bind a macrocycle, second to link temporarily a triazolium-containing molecular axle, and third to de...

2012
Nicholas G White Paul D Beer

A ferrocene bis(triazole) macrocycle was synthesised in good yield by the Eglinton coupling of an acyclic bis(alkyne) precursor and characterised in the solid state by X-ray crystallography. Alkylation gives the corresponding triazolium macrocycle, which binds chloride and benzoate strongly in CD(3)CN solution through favourable charge-assisted C-H···anion interactions, as evidenced by (1)H NMR...

Journal: :Nature nanotechnology 2010
Damian Ackermann Thorsten L Schmidt Jeffrey S Hannam Chandra S Purohit Alexander Heckel Michael Famulok

Mechanically interlocked molecules such as rotaxanes and catenanes have potential as components of molecular machinery. Rotaxanes consist of a dumb-bell-shaped molecule encircled by a macrocycle that can move unhindered along the axle, trapped by bulky stoppers. Previously, rotaxanes have been made from a variety of molecules, but not from DNA. Here, we report the design, assembly and character...

2015
Raúl Castañeda Tatiana V. Timofeeva Victor N. Khrustalev

The title compound, [Hg3(C6F4)3]·C6N4, contains one mol-ecule of tetra-cyano-ethyl-ene B per one mol-ecule of mercury macrocycle A, i.e., A•B, and crystallizes in the monoclinic space group C2/c. Macrocycle A and mol-ecule B both occupy special positions on a twofold rotation axis and the inversion centre, respectively. The supra-molecular unit [A•B] is built by the simultaneous coordination of...

Journal: :Organic & biomolecular chemistry 2011
Katy Cantin Simon Rondeau-Gagné Jules Roméo Néabo Maxime Daigle Jean-Francois Morin

An amide-containing phenylacetylene macrocycle (PAM) has been synthesized and its gelation properties were studied in different solvents. Surprisingly, this macrocycle forms organogels at low concentration in many polar and apolar solvents. XRD and FTIR analysis suggest that this macrocycle forms stable supramolecular assemblies owing to H-bonding. Scanning electron microscopy analyses show the...

Majid Soleimani Mohammad Nabi Sarbolouki,

The search for new stationary phases has been one of the predominant concerns in high performance liquid chromatography (HPLC) in order to achieve better resolutions, longer column lives, and reduce the time of analysis. A chromatographic packing for separation of underivatized amino acids (AAs) were prepared by dynamically coating 2-amino tetraphenyl prophyrin (atpp) on a C-18 reversed-pha...

2006
Eusebio Juaristi Karen Ochoa Lara Carolina Godoy-Alcántar Alexey V. Eliseev Anatoly K. Yatsimirsky

A chiral cyclophane–type macrocycle bearing two thiol groups has been prepared by chemical modification of S,S-(+)-tetrandrine. Cleavage of p-nitrophenyl acetate by deprotonated form of this macrocycle proceeds with a rate constant expected for a simple thiol anion of similar basicity, but the reactivity toward p-nitrophenyl esters of N-protected amino acids is one order of magnitude higher tha...

Journal: :The journal of physical chemistry letters 2016
Laura Alfonso Hernandez Tammie Nelson Maxim F Gelin John M Lupton Sergei Tretiak Sebastian Fernandez-Alberti

The interchromophoric energy-transfer pathways between weakly coupled units in a π-conjugated phenylene-ethynylene macrocycle and its half-ring analogue have been investigated using the nonadiabatic excited-state molecular dynamics approach. To track the flow of electronic transition density between macrocycle units, we formulate a transition density flux analysis adapted from the statistical m...

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