M1 Nanosciences
11 pages
English

M1 Nanosciences

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Description

Niveau: Supérieur, Master, Bac+4
104/03/2008 M1-Nanosciences Some of our own work… N N N N H HH H Cyclam - Formation of strong complexes with transition metal cations M - Can be chemically modified in various ways by functional groups Functional groups (coordinating, photosensitive, redox…) A real molecular platform

  • fe fe

  • tetrasubstituted cyclam-copper

  • cyclam

  • transition metal

  • metal complexes

  • visible spectroscopyfefe

  • functional group

  • reproducible processes


Sujets

Informations

Publié par
Publié le 01 mars 2008
Nombre de lectures 6
Langue English
Poids de l'ouvrage 1 Mo
A real molecular platform
M
- Formation of strong complexes with transition metal cations
Cyclam
Functional groups (coordinating, photosensitive, redox…)
- Can be chemically modified in various ways by functional groups
of our
Some
own
work
M1-Nanosciences
04/03/2008
M
04/03/2008
Stereochemistry of metal complexes of cyclam
Type III
Type I
Type IV
Type II
Type V
Electrochemical input ? Reversible change in the geometry
M1-Nanosciences
2
Fe
Fe
Me
Me
Characterization of tetrasubstituted cyclam-copper complexes
N N CuII N N
LCuII Type I
N N CuI N N
LCuI Type V
Me
Fe
Fe
Me
0028air-stable complexes
M1-Nanosciences
e-
3
?
Fe
Me
N N CuII N
e-
Me
Fe
Potentiostatic electrolyses followed by UV-visible Spectroscopy
Absorbance (λ= 600 nm) vs time Oxidation Potential : + 0 V ; Reduction Potential : - 0,8 V
II εLCu 1000
800
600
400
200
0
Reversible and reproducible processes
400
Buch0e4/r0,3/M20o0u8tet, Pécaut, Saint-Aman, RoyaMl;1 -INnaonrogs.c ieCncheesm.,2004,43, 3777
500
-0.6
600
-0.4 E/V
εLCuI LCuII LCuI250 200
700
I
-0.2
λ(nm)
800
150
100
50
0
N
04/03/2008
N
N
M N N
N
Second example: switchable supramolecular materials
N
N
N
Terpyridine subunit
N
NH
HN
N
N
N
N
2 kinds of coordination groups
M1-Nanosciences
5
N N N
,
N HN
NH N
=
Second example: switchable supramolecular materials
1 eq.
1 eq.
N N
N
= Cu2+, Co2+, Fe2+, Ni2+or Zn2+
04/03/2008
1 eq.
1 eq.
Heterometallic coordination polymer
Gel
A real molecular material
M1-Nanosciences 6 A. Gasnier, C. Bucher, J.-C. Moutet, E. Saint-Aman, P. Terech, G. Royal,in preparation
N N N
=
N HN
NH N
Redox active molecular
N N
N
Long Polymer chains
+ 1V  
materials
Redox-active materials
- 0.4V
Oligomers
Co2+Co3+ GelLiquid Stimuli responsive molecular material
04/03/2008A. Gasnier, C. Bucher, J.-C. MouteMt,1 -EN.a nSoasicnite-nAcemsan, P. Terech, G. Royal,in preparation
7
N
N
N
N
M N
04/03/2008
N
Third example: pH-Triggered Molecular
N
N
N
N HN
NH
N
O
N
TerpyridineO subunit 2 amide groups: Poor complexing macrocycle
N
N
N
Acid
N
N
O
Base
N
N
O
N
switch
N
N
N
N
PowerfMul1-Nanosclieexnicensg macrocycle comp
=
=
8
N N N
O NHN
NHN O
= Cu2+
N N N
Acid +
pH-Triggered
"Monomer form"
Molecular
switch
Translocation process
"Polymer form"
+ Base
04/03/2008 M1-Nanosciences 9 A. Gasnier, J.-M. Barbe, C. Bucher, F. Denat, J.-C. Moutet, E. Saint-Aman, G. Royal,submitted
Cyclam: a molecular platform
Electrochemical motor
04/03/2008
e-
M
Electrochemical switch
M1-Nanosciences
ch
l switch
+ 1V
- 0.4V
design + synthesis
Molecular Components
- Drop casting - Encapsulation into polymer matrix - Covalent grafting - Self-assembled monolayers - Langmuir-Blodgett films - …
04/03/2008
Bottom-up Fabrication
self-assembly, self-organization
Supramolecular System
Integration into solid devices / connexion to the macroscopic world...
M1-Nanosciences
Nanomaterial
11