Tetrabutylammonium Hexafluoroantimonate (TBA·SbF₆)
TBA·SbF₆ (CAS 22505-58-4) is the hexafluoroantimonate form of tetrabutylammonium, used as an organophilic SbF₆⁻ counter-ion material for NIR absorber dyes, optical filters, specialty inks, and sensitive formulation systems. It is evaluated where counter-ion choice may affect solubility, aggregation, color, haze, or stability.
What it is
- INCI/Name: Tetrabutylammonium Hexafluoroantimonate (TBA·SbF₆)
- CAS: 22505-58-4
- Synonyms: Tetrabutylammonium antimony(V) hexafluoride; TBA SbF6; TBA·SbF₆
- Also Search as: SBFO, TBA SbF6, TBA·SbF₆, TBASbF6, tetrabutylammonium antimony(V) hexafluoride, tetrabutylammonium hexafluoroantimonate, CAS 22505-58-4
- Form: Dry powder
- Pack sizes: 1 g, 5 g, 10 g, 25 g, 50 g, 100 g, 250 g, 500 g, 1 kg+
- Why SbF₆⁻ matters: SbF₆⁻ is a weakly coordinating counter-ion. It is often evaluated in systems where bromide salts may create compatibility, aggregation, color, haze, or cure-related concerns. Final performance is matrix-specific and must be tested in the customer’s formulation.
- QCR position: SBFO is not positioned as a universal anti-fog additive. It is a specialty ionic/counter-ion material for application-specific evaluation.
Why teams choose TBA·SbF₆
- SbF₆⁻ counter-ion form: SBFO provides the hexafluoroantimonate counter-ion form of tetrabutylammonium for systems where SbF₆⁻ is the desired counter-ion.
- Clarity at working loads: Organophilic ion pairing supports clear films in alcohol-rich and UV-curable matrices (reduced grain/bloom vs. bromide quats at similar ionic strength).
- Alternative to TBAB when SbF₆⁻ is desired: TBAB is inexpensive and useful in many systems, but some dye, ink, coating, or optical formulations may require evaluation of the SbF₆⁻ counter-ion form instead.
- Scale-up supply: QCR offers SBFO in practical gram-to-kilogram quantities for customers moving beyond catalog-scale sourcing.
- Application-specific screening: Compatibility, haze, color, stability, leaching, residual ionic impurities, and processing behavior should be verified in the customer’s actual matrix.
Applications & industries
NIR absorber dyes and optical filters
Counter-ion choice can affect solubility, aggregation, color, OD, and stability in cationic NIR absorber systems. SBFO / TBA·SbF₆ provides the SbF₆⁻ counter-ion form of tetrabutylammonium for evaluation in systems where bromide, PF₆⁻, or other counter-ions may not give the desired formulation behavior. SBFO is not the chromophore; it is a counter-ion material for systems that already use cationic absorber chemistry. Compatibility, color, OD, haze, and stability should be verified in the final resin, ink, coating, or film.
Dyes, inks, and colorants
SBFO may be useful in counter-ion exchange work where an SbF₆⁻ salt form is desired for a dye, ink, or optical formulation. This can be relevant in specialty inks, optical coatings, and absorber systems where ionic compatibility matters. Benefits are system-dependent and should be confirmed by testing solubility, aggregation, color strength, shelf stability, residual ions, and final film clarity.
Sensitive optical coating systems
TBA·SbF₆ may be evaluated in UV-curable, alcohol-rich, or sol-gel-type systems where counter-ion choice may affect compatibility, haze, cure, color, or stability. It should not be treated as a universal coating additive. Small compatibility screens should be run before line trials.
Nanoparticle-containing optical systems
Many IR/NIR optical systems use inorganic absorbers or nanoparticles to balance IR blocking, visible transmission, color, and haze. QCR is evaluating where SBFO may fit as a specialty ionic/counter-ion material in these systems. It should not be claimed as a proven nanoparticle dispersant without testing. If dispersion, haze, or resin compatibility are critical, screen SBFO against the actual particle surface chemistry, resin, solvent, and process.
Electrochemical and specialty material research
TBA salts are commonly used in non-aqueous electrochemical and specialty material systems because tetrabutylammonium is bulky and organophilic. Where an SbF₆⁻ counter-ion is preferred, SBFO may be useful for evaluation. Conductivity, electrochemical window, residual ionic impurities, purity, and stability must be confirmed in the user’s system
Evaluation approaches
Counter-ion exchange / dye salt work
Evaluate SBFO where the target chemistry requires or benefits from the SbF₆⁻ counter-ion form. Confirm purity, residual ionic impurities, solubility, absorbance profile, aggregation behavior, and shelf stability in the final vehicle.
Optical coating / film screening
For coatings or films, begin with small compatibility screens before coating production parts. Check solution clarity, haze, color shift, adhesion, cure behavior, residue/deposition, and stability after aging. Do not assume compatibility based on chemical structure alone.
Nanoparticle-containing systems
If evaluating SBFO in a nanoparticle-containing optical system, screen it against the actual particle surface chemistry and formulation vehicle. Monitor dispersion stability, haze, visible transmission, OD, settling, and any processing defects. Treat dispersion improvement as a testable hypothesis, not an assumed benefit.
Beyond coatings: where TBA⁺ compounds shine
These uses are mostly driven by the tetrabutylammonium cation. They are included for technical context and search relevance, but QCR’s primary focus for SBFO is optical absorber, dye, ink, coating, and specialty formulation systems where the SbF₆⁻ counter-ion form is being evaluated.
Conductive cationic surfactant.
Tetrabutylammonium (TBA⁺) is a large, hydrophobic cationic surfactant that can migrate to interfaces and help dissipate charge in certain polymer or coating matrices. Its bulk and lipophilicity reduce specific binding to many functional groups compared with smaller amines, which can help maintain optical clarity at practical loadings. Actual surface resistivity changes depend on matrix polarity, humidity, and total ion content—not guaranteed. The SbF₆⁻ counter-ion is weakly coordinating, which generally minimizes side interactions compared with Br⁻.Phase-transfer agent (PTC).
As a tetrabutylammonium phase transfer agent (aka TBA phase transfer), TBA⁺ can shuttle anions between aqueous and organic phases, enabling reactions where reagents are otherwise phase-separated. The effectiveness comes from the lipophilic cation carrying an anion into an organic medium while remaining ion-paired. Reaction rate/selection gains are system-dependent (substrate, base, solvent, temperature). SbF₆⁻ is often a spectator anion in PTC work; it’s less nucleophilic than Br⁻, which can be advantageous in sensitive systems.Structure-directing agent (NPs/MOFs).
In nanoparticle and MOF syntheses, bulky tetraalkylammonium ions can act as structure-directing agents, influencing nucleation, crystal habit, or pore architecture via ion-pairing and templating. The effect arises from cation size/shape and interfacial organization rather than strong coordination chemistry. Outcomes vary with precursor set, solvent, and ionic strength; empirical screening is standard practice. Using a weakly coordinating SbF₆⁻ counter-ion reduces competitive binding compared with more coordinating anions.Additive for conductive polymers.
In certain doped polymers, large, stable cations can impact ion transport, microphase morphology, or charge balance—TBA⁺ is sometimes used as an ionic conductivity additive or to modulate doping levels. Benefits, if any, depend on polymer chemistry (e.g., polythiophenes, polyaniline derivatives), solvent history, and processing. Over-ionization can hurt film mechanics or transparency, so optimization is required. The bromide-free SbF₆⁻ avoids introducing Br⁻, which may be undesirable in some oxidation-sensitive systems.Electrolyte material.
TBA⁺ salts are widely used as electrolyte salts in non-aqueous media because the cation is bulky, chemically robust, and compatible with many aprotic solvents. Conductivity and electrochemical window depend on both the solvent and the anion; SbF₆⁻ behaves as a weakly coordinating anion, which can support ion mobility without strong complexation. Thermal and electrochemical stability must be confirmed for each solvent/electrode pair. Moisture control and purity are important to avoid hydrolysis or side reactions.
Note: The behaviors above are primarily driven by the TBA⁺ cation. The SbF₆⁻ counter-ion is weakly coordinating and bromide-free relative to TBAB, which can be beneficial in sensitive optical and crosslinked systems—but results remain application-dependent and should be validated in your specific matrix and process.
Using TBAB or TBA-PF₆ today?
TBAB is inexpensive and useful in many systems. TBA-PF₆ is also widely used as an organophilic tetrabutylammonium salt in non-aqueous and specialty formulations. In applications where the SbF₆⁻ counter-ion form is preferred, SBFO / TBA·SbF₆ provides a practical TBA-based alternative for evaluation.
QCR supplies SBFO in gram-to-kilogram quantities for customers evaluating counter-ion effects in NIR absorber dyes, optical filters, specialty inks, coatings, and sensitive formulation systems.
If residual bromide, sodium, moisture, assay, or other ionic impurities are critical to your application, ask QCR about additional testing options.