Trans influence quantitative measurement

There have been extensive studies of the influence of an entering ligand on its rate of entry into a Pt(ll) complex.The rate constants for reaction of a large number and variety of ligands with trans-Pt(py)2C 2 have been measured (Table 4.13). The large range of reactivities is a feature of the associative mechanism and differentiates it from the behavior of octahedral complexes. The rate constants may be used to set up quantitative relationships. For a variety of reactions of Pt complexes in different solvents (Sec. 2.5.4) ... 

Beside the estimation of medium microviscosity, quartz plates modified by BFLl were used for the quantitative analysis of ascorbate. For this purpose, a number of solutions of ascorbic acid were prepared with different concentrations, and the kinetics of change in steady-state fluorescence was recorded. There are two parallel processes that influence fluorescence (a) trans-cis photoisomerization and (b) reduction of the nitroxide moiety in traws-BFLl. After a correction taking into account the influence of trans-cis photoisomerization (curve b ), the pseudo-first-order kinetics of BFL reduction appears as curve c. The correction was done by performing a parallel measurement under identical conditions but without adding ascorbate. 

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