ic6b01059_si_002.cif (324.35 kB)
H2PO4–- and Solvent-Induced Polymorphism of an Amide-Functionalized [Pt(N^C^N)Cl] Complex
dataset
posted on 2016-09-28, 12:21 authored by Zhong-Liang Gong, Yu-Wu ZhongA simple [Pt(N^C^N)Cl]
complex functionalized with an amide group was prepared, and its absorption
and emission properties were examined in different solvents in response
to various anions. On the one hand, in the presence of H2PO4–, the solution of the complex shows
distinct color changes in CH3CN, together with a ratiometric
emission change from a green emission band at 537 nm to a deep red
emission band at 680 nm. On the other hand, two-step spectral changes
were observed in response to H2PO4– in CH2Cl2, with the green emission being attenuated
first followed by the appearance of enhanced and yellow-green emissions
at a lower-energy region. These recognition processes are highly selective
for H2PO4– against other common
anions including F–, Cl–, Br–, I–, OAc–, NO3–, and HSO4–. In addition, the platinum complex displays multistage emission
polymorphism in mixed CH3CN/H2O solvent of various
ratios. The hydrogen-bonding interaction between H2PO4– and the amide unit was confirmed by NMR
analysis. In the solid state, this platinum complex emits red light.
However, the composite material of the platinum complex with H2PO4– shows purely monomeric yellow
emissions. The solid-state materials were further analyzed by single-crystal
X-ray and Fourier-transform IR analysis. These studies suggest that
this simple platinum complex is useful for the selective recognition
of H2PO4– and as solid-state
emitting materials with tunable emission colors.