Fullerene Chromatography Solutions

Fullerenes (C60, C70 and higher fullerenes) dissolve poorly and recover badly on conventional columns, which makes them difficult to separate. The COSMOSIL Buckyprep family, developed specifically for fullerenes, achieves high-loading, tail-free separation and preparative purification in toluene and other good solvents.

C60 / C70 Standard Separation

The Buckyprep column (pyrenylpropyl phase) is the industry reference for fullerene separation. With toluene as the mobile phase, C60 and C70 give sharp, tail-free peaks and the load can be raised considerably relative to a C18 column, making it the first choice for preparative fullerene purification.

Buckyprep Toluene mobile phase Preparative grades available

Metallofullerene Separation

Buckyprep-M is optimized for endohedral metallofullerenes and higher fullerenes, offering selectivity different from Buckyprep and suiting metallofullerenes of similar properties that conventional columns cannot distinguish.

Buckyprep-M Endohedral metallofullerenes Higher fullerenes

High-Efficiency Preparative Purification

The PBB column (pentabromobenzyl phase) gives stronger retention and selectivity than Buckyprep, suiting high-purity preparation of C60/C70 and separation of higher fullerenes (C76, C78, C84 and others) where more resolution is needed.

PBB column Higher fullerenes High resolution

Fullerene derivatives and isomers

The PYE column (pyrenylethyl phase) provides strong π–π interaction and excels at separating structural isomers and derivatives; the NPE column offers complementary selectivity, suited to fine separation of fullerene derivatives in organic photovoltaic materials such as PCBM.

PYE column NPE column PCBM / photovoltaic materials

Feed Material & Target Product

Cage and principal derivative structures, rendered by RDKit as orthogonal projections of the three-dimensional cages. Cages are drawn as skeletal representations without marking 6,6-bond positions; addition sites on fullerenols and fluorinated fullerenes are indicative and n is a representative value — the actual number and distribution of additions depend on the reaction conditions. Swipe horizontally on mobile.

Fullerene cage and principal derivative structures: C60, C70, fullerenol, fluorinated fullerene, PC61BM, PC71BM (rendered with RDKit)

Dedicated column	Bonded phase	Best suited to	Characteristics
Buckyprep	Pyrenylpropyl	C60 / C70 Standard Separation	The industry reference; high-load preparative work
Buckyprep-M	Phenothiazine	Metallofullerenes / higher fullerenes	Selectivity complementary to Buckyprep
PBB	Pentabromobenzyl	High-purity preparation / higher fullerenes	Stronger retention and resolution
PYE	Pyrenylethyl	Structural isomers / derivatives	Strong π–π selectivity
NPE	Nitrophenylethyl	Fullerene derivatives / PCBM	Complementary selectivity
Note: toluene is the preferred mobile phase for fullerenes, giving high solubility and good recovery; all the columns above are optimized for toluene systems.

Detailed Specs for Five Dedicated Columns

Data from the COSMOSIL fullerene column series; swipe horizontally on mobile for the full comparison.

Packing	Buckyprep	Buckyprep-M	PBB	PYE	NPE
Silica substrate	High-purity porous spherical silica
Mean particle size	5 μm
Mean pore size	About 120 Å
Surface area	About 300 m²/g
Stationary phase structure
Bonded group	Pyrenylpropyl	Phenothiazine	Pentabromobenzyl	Pyrenylethyl	Nitrophenylethyl
Bonding type	Monomeric
Endcapping	Nearly complete	None	Nearly complete	—	—
Carbon load	About 17%	About 13%	About 8%	About 18%	About 9%
Characteristics	Standard fullerene separation column	Metallofullerene separation	Preparative separation of C60/C70	Fullerenes and structural isomers	Fullerene derivatives

Recommended Configuration for Fullerene Preparation

The core combination from analytical selection to industrial preparative purification

Buckyprep analytical / preparative columns Buckyprep-M (metallofullerenes) PBB (high-purity preparation) PYE / NPE (derivatives) Toluene mobile phase

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Technology Routes

Comparison of Separation & Purification Routes

Extraction of fullerenes is a relatively mature step; the constraints on cost and efficiency sit in separation and refining. The table below compares the main routes reported in public sources by principle, achievable purity and demonstrated scale. Purity and scale are listed as publicly disclosed and have not been verified by us.

Technology	Principle	Achievable purity	Demonstrated scale	Applicability and limitations
Soxhlet / maceration extraction	Fullerenes dissolve in toluene, o-xylene and CS₂, separating from amorphous carbon	Crude mixture	Industrial scale	Mature and a small share of cost; solvent recovery and residue control govern downstream quality
Alumina / activated carbon column chromatography	Differences in adsorption strength; C₆₀ elutes before C₇₀	About 95%–99%	Pilot to industrial	Low cost and scalable; limited purity ceiling, with yield lost to irreversible adsorption on the stationary phase
Chlorobenzene elution + activated carbon	Exploits the higher solubility of C₆₀ in chlorobenzene	Reported > 99%	Batch production feasible	Public sources describe it as scalable; chlorobenzene is a controlled solvent with demanding environmental and residue requirements
Preparative HPLC	Fullerene-specific stationary phases such as pyrenyl, phenothiazine and pentabromobenzyl	99.9%–99.99%	Kilogram / annual scale	Good purity and cage-type resolution; low throughput, high solvent consumption and a large share of cost in the stationary phase
Fractional crystallization	Solubility differences between C₆₀ and C₇₀ in CS₂ or o-xylene	Mainly enrichment	Gram scale in the literature	No stationary phase losses; requires prolonged stirring and sometimes heating, and scale-up efficiency remains to be demonstrated
Selective complexation / host–guest precipitation	γ-cyclodextrin, calixarenes, porphyrin cages, triptycene–bowl molecules, AgNO₃ molecular cages	Reported up to 99.5% in the literature	Laboratory scale	Avoids the irreversible adsorption losses of chromatography; host molecule cost and recyclability are prerequisites for industrialization
Simulated moving bed chromatography	Multi-column switching gives continuous countercurrent separation	Depends on the stationary phase	No commercial fullerene installation publicly disclosed	Mature in peptide and chiral separation, and a plausible route to lowering the cost of fine fullerene separation
Vacuum sublimation	Removes residual solvent and low-volatility impurities	Sublimation grade, 99.9%+	Kilogram to pilot scale	The grade dividing line for vacuum deposition applications; energy consumption and yield must be balanced
Note: the table is compiled from public sources, and purity and scale figures for the same route differ between sources. "Demonstrated scale" refers to the largest implementation publicly disclosed and does not indicate current production capacity.

Fine separation is where cost concentrates

Public sources are consistent on this point: extraction is mature, while separation is costly and inefficient, and is the main reason high-purity fullerene prices have stayed high. Competition in industrialization tends to centre on fine separation and sublimation refining rather than on synthesis.

Fine separation Sublimation refining

The stationary phase determines yield and resolution

Yield losses on the chromatographic route come mainly from irreversible adsorption on the stationary phase, which is the argument behind the host–guest route. Using fullerene-specific bonded phases with a toluene system can improve loading and recovery while retaining resolution.

Specifications for the five columns →

Demand Side

Downstream Applications & Demand Drivers

Different applications differ considerably in their requirements for purity, residual solvent and batch consistency, which in turn determines how far the separation step must go. The table below sets out consumption characteristics, industrialization status and demand drivers; the assessments are inferences from public information.

Application	Consumption and specification requirements	Industrialization status	Assessment of demand pull
Electron transport layers in perovskite and tandem cells	Vacuum-deposited C₆₀ thin films, requiring sublimation-grade purity and low residual solvent; consumption per GW of line capacity, calculated from film thickness and utilization, is well above current research and cosmetics demand	Several GW-scale lines in China came on stream from 2025 and larger-scale manufacturing began in 2026 (per industry reports); because C₆₀ costs are high, some manufacturers use a C₆₀/SnO₂ composite electron transport layer	On publicly available information, this appears the direction most likely to pull ton-scale fullerene capacity. The constraints are raw material price (public sources cite around RMB 200/g) and deposition material utilization
Organic photovoltaics and organic photodetectors	PC₆₁BM / PC₇₁BM or deposited C₆₀; demanding on batch consistency	OPV products are commercially available; organic photodetectors for full-screen fingerprint sensing are described by manufacturers as close to commercialization	Consumption per unit area is small, but it generates steady orders for high-purity derivatives and is the main outlet for Japanese combustion-process capacity
Lubricant and lubricating material additives	Manufacturers report that around 100 ppm markedly reduces wear on metal parts; mixed fullerenes are acceptable	Commercial products exist; early applications included satellite gyroscope lubrication, and Chinese manufacturers have launched additives for trucks	Purity requirements are relatively relaxed, so intermediates outside the fine separation stream can be absorbed, which helps overall line economics
Cosmetics	Fullerenes and fullerenols as antioxidant ingredients, with residual solvent and metal impurities to be controlled	Serums, masks and concentrates are established categories; several Chinese raw material suppliers also sell finished cosmetics	High unit price, small total volume. Market research firms' estimates of the size and growth of this segment differ widely and are of limited comparability. Public reporting from 2024 also records administrative penalties in the sector over advertising language, so claim compliance warrants attention
Biopharmaceuticals	Metallofullerenes such as Gd@C₈₂ for MRI contrast; fullerenols in antioxidant and antitumour research	Companies state that kilogram-scale raw material lines are built; as of the search date, no public record of an approved IND for a metallofullerene drug in China was found	The highest unit price segment, but constrained by drug review timelines, so large-scale raw material demand is unlikely in the near term
Metal matrix composites	Introducing fullerenes into aluminium and copper matrices	Reports state that fullerene-laminated aluminium reaches an ultimate bending strength comparable to 45 steel at about one third the density, and that copper composites show roughly one third the friction coefficient of pure copper	If validated in rail transit, bearings and similar applications, consumption per unit would be substantial; publicly reported volume applications are currently limited
Lithium battery electrolyte additives	Fluorinated fullerenes as entropy-tuning additives in lithium metal batteries	Published jointly by companies, universities and research institutes in 2026; at the research stage	Consumption would be considerable if industrialized; no public information on pilot or volume production at present
Other	Resin anti-ageing, laser protection, photocatalytic formaldehyde removal, agricultural and veterinary protection, catalysis and adsorption	Mostly at trial or small-batch stage	Dispersed demand, limited in aggregate in the near term

Working back from application specification to separation scheme

Deposition-grade C₆₀ and PCBM for photovoltaics place the strictest demands on purity, residual solvent and batch consistency, and normally require fine separation on dedicated columns together with sublimation refining; lubricant and some industrial uses can be relaxed to column-chromatography-grade intermediates.

Deposition grade: Buckyprep / PBB fine separation + sublimation Derivatives: PYE / NPE Metallofullerenes: Buckyprep-M Industrial grade: column chromatography intermediates

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Fullerene separation andindustrial preparation

Industrial preparation of high-purity fullerenes