Abstracts Book - IMRC 2018

• SA6-P042
STUDY OF ELECTRON TRANSFER IN COBALT
HEXACYANOFERRATE NANOPARTICLES PROMOTED BY REVERSE
MICROEMULSIONS PREPARED WITH CTAB
Laura Guadalupe Vazquez Novoa 1
1 Universidad de Guadalajara, Ingenieria en Nanotecnologia, Mexico.
The coordination polymer nanostructures are materials that have unique
properties that result the high surface volume ratio that differentiate them
materials with sizes that fall on the macroscopic scale. The nanoparticles of
cobalt hexacyanoferrates (CoHCF) are part of this type of compounds. During
the synthesis by means of inverse microemulsions with
cetyltrimethylammonium bromide (CTAB) as a surfactant, it was observed that
the color of the nanoparticles contained in the microemulsion changes
spontaneously reddish brown to green without varying the temperature. The
nanoparticles of CoHCF (III) have a characteristic reddish-brown coloration,
while the nanoparticles of CoHCF (II) have a green coloration. Therefore, the
color change in these compounds has been attributed to the transfer of
electrons. In addition, it was observed that if the initial concentrations of the
reactants are varied, it is possible to obtain CoHCF with different
stoichiometries, which suggests that the relationship between the components
plays a fundamental role in the transfer of electrons. From this information, in
this work a diagram of concentrations of reactants for obtaining CoHCF
nanoparticles with different stoichiometries is proposed, proposing two
possible factors that promote the transfer of electrons: a) Cl - and Br - anions, of
the cobalt chloride reactant (CoCl2) and the CTAB surfactant respectively, enter
the crystalline structure of CoHCF, yielding an electron causing the reduction of
Fe 3+ ions.
Acknowledgment:
Dr. Alberto Gutierrez Becerra and Lic. Teresa Lara Estrada
Keywords: Cobalt hexacianoferrate, Reverse microemulsions, Electron transfer
Presenting authors email: lauravano92@gmail.com