Tuning Reactivity of Platinum(II) Complexes

Figure 3.2 Spectrum obtained from the stopped-flow spectrometer with a single
exponential fit for the reaction between CH3PhPtCl (2.50 x10 -5 M) and
DMTU (1.25 x 10 -3 M) in methanol followed at 308 nm, I = 0.1 M
(LiCF3SO3), T = 298.15 K…………………………………………………….….16
Figure 3.3 Concentration dependence of kobs for the substitution of chloride
from pyPhenPtCl (5.0 x 10 -5 M) by (a) thiourea nucleophiles and (b)
anionic nucleophiles in methanol, I = 0.1 M (LiCF3SO3), T = 298.15
K…………………………………………………………………………………………...18
Figure 3.4 Plots of ln (k2/T) against 1/T for the substitution of chloride from
pyPhenPtCl by TU, DMTU, TMTU, I¯, SCN¯ and Br¯ in methanol, over
the temperature range 288-308 K…………………………………...….…..20
Figure 3.5 Absorption spectra of CH3PhPtCl and CH3PhisoqPtCl in
acetonitrile………………………………………………………………………….…21
Figure 4.1. Structures of the investigated dinuclear Pt(II) complexes
……………………………………………..………………………………………………. .3
Figure 4.2 Density functional theoretical (DFT) minimum structures, HOMO
and LUMO frontier molecular orbitals for dinuclear Pt(II)
complexes………………………………………………………..…………………….11
Figure 4.3 (a) UV-Visible spectra for the titration of 0.1 mM 2,5pzn with
NaOH as a function of pH in the range 1 to 10 at T = 298.15 K; (b)
Inset: the titration curve at 297 nm …………………..………..……..……13
Figure 4.4 Typical spectrum obtained from the stopped-flow (A) and UV-Vis
spectrophotometer (B) with double exponential fit for the
reaction between 2,5pzn (2.14 × 10 −5 M) and TU (1.00×10 −3 M)
followed at 400 nm, T = 298.15 K …………………….............................18
Figure 4.5 Concentration dependence of kobs(1 st ) for the displacement of first
aqua ligand in 2,5pzn by thiourea nucleophiles, pH = 2.0, T =
298.15 K ………………………………………………………………………..…….19
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