Charge instability of symmetry broken dipolar states in quadrupolar and octupolar triphenylamine derivatives.
نویسندگان
چکیده
The quadrupolar and octupolar cyano triphenylamines shows symmetry broken dipolar charge transfer state, however, its stability can be controlled by the rotation of N-C bond of amino and phenylene moiety.
منابع مشابه
Octupolar ordering of Γ8 ions in magnetic field
Motivated by the recent suggestion that the 25K phase transition of NpO2 may be explained as octupolar ordering, we study f -electron lattice models which are capable of supporting octupolar, as well dipolar and quadrupolar order. Analyzing the properties of the Γ8 ground state quartet, we find that (111)-type combinations of the Γ5 octupoles T β 111 = T β x +T β y +T β z are the best candidate...
متن کاملBranching of dipolar chromophores: effects on linear and nonlinear optical properties
Structurally related chromophores of different symmetry (dipolar, V-shaped, octupolar) are investigated and compared for elucidation of the combined role of branching and charge symmetry on absorption, photoluminescence and twophoton absorption (TPA). Their design is based on the assembly of one, two or three π-conjugated dipolar branches on a central core. Two series of branched structures obt...
متن کاملTwo-photon transitions in quadrupolar and branched chromophores: experiment and theory.
A combined experimental and theoretical study is conducted on a series of model compounds in order to assess the combined role of branching and charge symmetry on absorption, photoluminescence, and two-photon absorption (TPA) properties. The main issue of this study is to examine how branching of quadrupolar chomophores can lead to different consequences as compared to branching of dipolar chro...
متن کاملBeyond the Förster formulation for resonance energy transfer: the role of dark states.
Resonance Energy Transfer (RET) is investigated in pairs of charge-transfer (CT) chromophores. CT chromophores are an interesting class of π conjugated chromophores decorated with one or more electron-donor and acceptor groups in polar (D-π-A), quadrupolar (D-π-A-π-D or A-π-D-π-A) or octupolar (D(-π-A)(3) or A(-π-D)(3)) structures. Essential-state models accurately describe low-energy linear an...
متن کاملDirect Visualization of Excited-State Symmetry Breaking Using Ultrafast Time-Resolved Infrared Spectroscopy.
Most symmetric quadrupolar molecules designed for two-photon absorption behave as dipolar molecules in the S1 electronic excited state. This is usually explained by a breakup of the symmetry in the excited state. However, the origin of this process and its dynamics are still not fully understood. Here, excited-state symmetry breaking in a quadrupolar molecule with a D-π-A-π-D motif, where D and...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Chemical communications
دوره 50 52 شماره
صفحات -
تاریخ انتشار 2014