C₃₂H₄₄N₂O₆ (SQIB)

3 datasets, together covering 0.45–0.9 µm. Default: Funke et al. 2011: n,k(α) 0.450–0.900 µm.

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Datasets

Use it in Lightsmith

Load this data in Python, simulate in one more line

pip install lightsmith

import lightsmith as ls

# C32H44N2O6 (SQIB): Funke et al. 2011: n,k(α) 0.450–0.900 µm
c32h44n2o6 = ls.fetch_refractiveindex("organic", "SQIB", "Funke-α", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(c32h44n2o6.range_nm)  # (450, 900) nm
eps = c32h44n2o6.eps([633])  # complex permittivity

Downloads the original record once (pinned to the imported snapshot) and caches it.

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_d8b349ef4fd2/lightsmith"
c32h44n2o6 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(c32h44n2o6.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (sqib/funke-2011).

# ... load c32h44n2o6 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=c32h44n2o6)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=450, stop_nm=900, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength

Same spec runs with DDA, FDTD, BEM or T-matrix: ls.compare(sim, ["mie", "dda"]).

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Lightsmith is open source (MIT): Mie, T-matrix, BEM, DDA, FDTD, RCWA, TMM, mode solvers and inverse design behind one spec, on CPU or GPU. GitHub.

About C32H44N2O6 (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.

Other names: C32H44N2O6, 2,4-bis[4-(N,N-diisobutylamino)-2,6-dihydroxyphenyl]squaraine, C₃₂H₄₄N₂O₆

API: /v1/materials/mat_28781d79265c · slug sqib