  The role of chirality in determining the spin dynamics of photoinduced
electron transfer in donor-acceptor molecules remains an open question.
Although chirality-induced spin selectivity (CISS) has been demonstrated in
molecules bound to substrates, experimental information about whether this
process influences spin dynamics in the molecules themselves is lacking. Here
we use time-resolved electron paramagnetic resonance spectroscopy to show that
CISS strongly influences the spin dynamics of isolated covalent donor-chiral
bridge-acceptor (D-B$\chi$-A) molecules in which selective photoexcitation of D
is followed by two rapid, sequential electron transfer events to yield
D$^+$-B$\chi$-A$^-$. Exploiting this phenomenon affords the possibility of
using chiral molecular building blocks to control electron spin states in
quantum information applications.
