In a
TICT state formed by
intramolecular charge transfer in an
electron donor (D)/acceptor (A) molecule, the D and A subgroups have a mutually perpendicular configuration
that leads to electronic decoupling of D and A.
Source:
PAC, 2007, 79, 293
(Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006))
on page 436