%0 Journal Article
%A Iyer, Abishek K.
%A Peter, Sebastian C.
%D 2014
%T Two-Dimensional Bicapped Supramolecular Hybrid Semiconductor
Material Constructed from the Insulators α‑Keggin Polyoxomolybdate
and 4,4′-Bipyridine
%U https://acs.figshare.com/articles/journal_contribution/Two_Dimensional_Bicapped_Supramolecular_Hybrid_Semiconductor_Material_Constructed_from_the_Insulators_Keggin_Polyoxomolybdate_and_4_4_Bipyridine/2335906
%R 10.1021/ic402858u.s001
%2 https://acs.figshare.com/ndownloader/files/3973522
%K band gap
%K material
%K compound
%K XPS measurements
%K bpy
%K Keggin
%K valent molybdenum
%K UV
%K XRD studies
%K Absorption measurements show
%K semiconducting nature
%K 2.99 eV
%K hydrothermal method
%K crystal
%K spectroscopy
%K supramolecular 2 D layer structures
%K 14O
%K IR
%K 70 K
%X A new organic–inorganic hybrid
material [SiMo14O44](H4,4′-bpy)2·xH2O (4,4′-bpy = 4,4′-bipyridine)
was synthesized using a hydrothermal method. The compound was characterized
using single crystal X-ray diffraction (XRD), infrared spectroscopy
(IR), ultraviolet–visible spectroscopy (UV–vis), and
X-ray photoelectron spectroscopy (XPS). XRD studies on selected single
crystals suggested that the compound consists of supramolecular 2D
layer structures composed of capped α-Keggin polyoxomolybdate
anions and 4,4′-bpy organic ligands. Absorption measurements
show a band gap of 2.99 eV in the hybrid which suggests a semiconducting
nature compared to the insulating free α-Keggin and 4,4′-bpy.
The magnetic susceptibility of the hybrid material was investigated
in the temperature range 1.8–300 K obeying the Curie–Weiss
law above 70 K. Experimentally measured magnetic moment of 2.71 μB/formula indicates possible mixed valent molybdenum in the
compound. The XPS measurements confirm the presence of both MoV and MoVI in the ratio 15:85 resulting in the structural
formula of the hybrid as [SiMoV2MoVI12O44](H4,4′-bpy)2·xH2O.
%I ACS Publications