Search anything and hit enter
  • Teams
  • Members
  • Projects
  • Events
  • Calls
  • Jobs
  • publications
  • Software
  • Tools
  • Network
  • Equipment

A little guide for advanced search:

  • Tip 1. You can use quotes "" to search for an exact expression.
    Example: "cell division"
  • Tip 2. You can use + symbol to restrict results containing all words.
    Example: +cell +stem
  • Tip 3. You can use + and - symbols to force inclusion or exclusion of specific words.
    Example: +cell -stem
e.g. searching for members in projects tagged cancer
Search for
Count
IN
OUT
Content 1
  • member
  • team
  • department
  • center
  • program_project
  • nrc
  • whocc
  • project
  • software
  • tool
  • patent
  • Administrative Staff
  • Assistant Professor
  • Associate Professor
  • Clinical Research Assistant
  • Full Professor
  • Graduate Student
  • Lab assistant
  • Non-permanent Researcher
  • Permanent Researcher
  • Pharmacist
  • PhD Student
  • Physician
  • Post-doc
  • Project Manager
  • Research Associate
  • Research Engineer
  • Retired scientist
  • Technician
  • Undergraduate Student
  • Veterinary
  • Visiting Scientist
  • Deputy Director of Center
  • Deputy Director of Department
  • Deputy Director of National Reference Center
  • Deputy Head of Facility
  • Director of Center
  • Director of Department
  • Director of Institute
  • Director of National Reference Center
  • Group Leader
  • Head of Facility
  • Head of Operations
  • Head of Structure
  • Honorary President of the Departement
  • Labex Coordinator
Content 2
  • member
  • team
  • department
  • center
  • program_project
  • nrc
  • whocc
  • project
  • software
  • tool
  • patent
  • Administrative Staff
  • Assistant Professor
  • Associate Professor
  • Clinical Research Assistant
  • Full Professor
  • Graduate Student
  • Lab assistant
  • Non-permanent Researcher
  • Permanent Researcher
  • Pharmacist
  • PhD Student
  • Physician
  • Post-doc
  • Project Manager
  • Research Associate
  • Research Engineer
  • Retired scientist
  • Technician
  • Undergraduate Student
  • Veterinary
  • Visiting Scientist
  • Deputy Director of Center
  • Deputy Director of Department
  • Deputy Director of National Reference Center
  • Deputy Head of Facility
  • Director of Center
  • Director of Department
  • Director of Institute
  • Director of National Reference Center
  • Group Leader
  • Head of Facility
  • Head of Operations
  • Head of Structure
  • Honorary President of the Departement
  • Labex Coordinator
Search
Go back
Scroll to top
Share
© Research
Publication : Helvetica Chimica Acta

Self-Assembled Triple-Stranded Lanthanide Dimetallic Helicates with a Ditopic Ligand Derived from Bis(benzimidazole)pyridine and Featuring an (4-Isothiocyanatophenyl)ethynyl Substituent

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Helvetica Chimica Acta - 24 Jan 2002

Raphaël Tripier, Marcel Hollenstein, Mourad Elhabiri, Anne-Sophie Chauvin, Gaël Zucchi, Claude Piguet, and Jean-Claude G. Bünzli

Helv. Chim. Acta 2002, 85, 1915-1929

Bis(2-{6-(diethylcarbamoyl)-4-[(4-isothiocyanatophenyl)ethynyl]pyridin-2-yl}-1-ethylbenzimidazol-5-yl)-
methane (LG) reacts with trivalent lanthanide ions in acetonitrile to yield triple-stranded dimetallic helicates
[Ln2(LG)3]6. 1H-NMR Data point to the helicates being the only species formed under stoichiometric
conditions and having a time-averagedD3 symmetry on the NMR time scale. The photophysical properties of LG
and its helicates are discussed with respect to the closely related ligands LB, LE, and their complexes, two ligands
devoid of the isothiocyanatophenylethynyl substituent. The quantum yield of the ligand fluorescence is three
times smaller compared to LE, while that of the EuIII-centered luminescence (1.1%) is three times larger. On the
other hand, the luminescence of TbIII is not sensitized by LG. This is explained in terms of energy differences
between the singlet and triplet states on one hand, and between the 0-phonon transition of the triplet state and
the excited metal ion states on the other. This work demonstrates that bulky substituents in the 4-position of the
pyridine ring do not prevent the formation of triple-stranded helicates, opening the way for luminescent probes
that can easily be coupled to biological materials.