Real-time picosecond measurements of electronic energy transfer from DODCI to malachite green and DQOCI

Singlet-singlet resonance energy transfers from DODCI (donor) to malachite green and to DQOCI in ethanolic solutions have been investigated with a real-time picosecond streak-camera (time-resolution 3–5 ps) operating at a repetition rate of 140 MHz, in synchronism with the pulse train from a mode-locked cw dye laser used as excitation source. Acceptor concentrations from 10^?5 M to 7.5 × 10^?3 M were studied and average R_o values of 45.6 Å for malachite green and 61.8 Å for DQOCI are obtained from the directly measured fluorescence decay curves. Departure from Förster kinetics is seen at the lower acceptor concentrations employed.     

A “Multiplicative Coboundary” theorem for some sequences of random matrices

Schmidt(¹⁰) showed that if the family of distributions of the partial sums of a strictly stationary random sequence is tight, then that random sequence is a coboundary. Here an analog of that result is proved for some sequences of random matrices, with partial sums replaced by matrix products.     

Ferrocene studies. IV. Some furan containing derivatives of ferrocene

The condensation of ferrocenecarboxyhydrazide, ferrocenecarboxaldehyde and acetylferrocene with a number of furan derivatives is reported. The reaction of chalcones containing both the furan and the ferrocene nucleus with Phenylhydrazine and hydrazine proceeds to yield pyrazolines.