Optical constants of C32H44N2O6 (SQIB)
Funke et al. 2011: n,k(α) 0.450–0.900 µm
Complex refractive index (n+ik)
Derived optical constants
Conditions
direction: alpha
Comments
nα, kα (c-axis).
References
S. Funke, M. Duwe, F. Balzer, P. H. Thiesen, K. Hingerl, M. Schiek. Determining the dielectric tensor of micro-textured organic thin films by imaging Mueller matrix ellipsometry. J. Phys. Chem. Lett. 12, 3053-3058 (2021) (Numerical data kindly provided by Manuela Schiek)
Data
Additional information
About SQIB
SQIB is a squaraine dye molecule widely studied for its strong absorption in the near-infrared region and excellent photostability. With a molecular formula of C32H44N2O6, it consists of a central squaraine core linked to substituted diisobutylamino-hydroxyphenyl groups. The abbreviation SQIB comes from “SQ” for squaraine and “IB” for the diisobutyl substituents.
SQIB is most often investigated in its crystalline form, where the molecules arrange into ordered π–π stacked structures. These single crystals and crystalline thin films exhibit sharp and intense absorption bands, strong excitonic coupling, and anisotropic optical properties that depend on crystal orientation.
The bulky alkyl substituents improve solubility in organic solvents and facilitate the growth of high-quality films and crystals. SQIB crystals are of significant interest for organic photovoltaics (OPVs), organic field-effect transistors (OFETs), near-infrared photodetectors, and fundamental studies of exciton transport and molecular aggregation.
Owing to its strong optical response, tunable self-assembly, and crystalline order, SQIB remains an important model compound in the design of next-generation optoelectronic materials.
- 2,4-bis[4-(N,N-diisobutylamino)-2,6-dihydroxyphenyl]squaraine
- C32H44N2O6