Key Takeaways & Executive Findings
- •• • Achieved a photocatalytic Minisci-type cross-coupling rate of 40 mmol g_cat−1 h−1 under LED irradiation and 10.9 mmol g_cat−1 h−1 under natural sunlight, representing a significant improvement over conventional photocatalysts that require 5–48 h for 0.2 mmol-scale reactions, thus enabling faster synthesis for pharmaceutical intermediates. • • The ultra-thin g-C3N4 nanosheets possess a high specific surface area of 120 m2 g−1, which enhances substrate adsorption and accelerates surface electron transfer, directly boosting photocatalytic efficiency and enabling gram-scale synthesis, a critical step toward industrial scalability. • • The catalyst exhibits excellent recycling stability, as demonstrated by successful reuse without significant loss of activity, reducing catalyst cost and waste in continuous manufacturing processes. • • The protocol operates under mild conditions using LED or natural sunlight, eliminating the need for stoichiometric oxidants and Ag catalysts used in classical Minisci reactions, thereby reducing environmental impact and operational hazards.
Abstract
Photochemical organic synthesis exploits the distinctive redox properties of excited-state photocatalysts to avoid stoichiometric redox reagents, enabling green and sustainable transformations. However, the conversion efficiency of light-to-chemical energy remains a key bottleneck for large-scale application. Here, we synthesize ultra-thin graphitic carbon nitride (g-C3N4) nanosheets by regulating precursor types and thermal protocols. In photochemical Minisci-type cross-couplings, this ultra-thin carbon nitride exhibits high catalytic efficiency, achieving rates of 40 mmol g_cat−1 h−1 under LED irradiation and 10.9 mmol g_cat−1 h−1 under natural sunlight. The photocatalyst's high specific surface area (120 m2 g−1) enhances substrate adsorption capacity and accelerates surface electron transfer, boosting photocatalytic efficiency. Furthermore, the material demonstrates excellent recycling stability, and the reaction system was successfully scaled to gram-level, highlighting its potential for industrial applications. This work provides a typical case for solar-driven organic synthesis and inspires further developments in heterogeneous photocatalysis.
1. Introduction
N-heteroarenes are ubiquitous in natural products, organic materials, and small-molecule drugs, with 82% of FDA-approved pharmaceuticals between 2013 and 2023 containing at least one N-heterocycle. Selective C–H functionalization of these scaffolds is a powerful strategy for streamlining pharmaceutical synthesis. The classical Minisci reaction, while effective, relies on Ag catalysts and stoichiometric oxidants, posing challenges in cost, waste, and selectivity. Photocatalytic systems offer milder conditions and tunable selectivity, but existing protocols suffer from slow kinetics (5–48 h for 0.2 mmol-scale) and high catalyst costs, hindering industrial translation.
Graphitic carbon nitride (g-C3N4) is a polymeric semiconductor with simple preparation and high chemical stability, but its bulk form suffers from low specific surface area due to compact interlayer stacking, limiting photocatalytic efficiency. This work addresses this bottleneck by synthesizing ultra-thin g-C3N4 nanosheets via precursor and thermal protocol regulation, achieving a high specific surface area of 120 m2 g−1. This structural modification enhances substrate adsorption and electron transfer, resulting in record photocatalytic Minisci-type cross-coupling rates under LED and natural sunlight, and demonstrating gram-scale scalability with excellent recycling stability, positioning g-C3N4 as a viable industrial photocatalyst.
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Xiaoyu Wang, Yu Yang, Yifan Li, Yichang Liu, Zaicheng Sun (2026). Efficient photocatalytic Minisci-type cross-coupling over ultra-thin graphitic carbon nitride nanosheet. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3756-5
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Frequently Asked Questions
What is the specific surface area of the ultra-thin g-C3N4 nanosheets and how does it compare to bulk g-C3N4?
The ultra-thin g-C3N4 nanosheets exhibit a specific surface area of 120 m2 g−1, which is significantly higher than that of bulk g-C3N4 (typically <10 m2 g−1). This increase is achieved by regulating precursor types and thermal protocols, leading to enhanced substrate adsorption and faster surface electron transfer, which directly contributes to the high photocatalytic efficiency.
How does the photocatalytic efficiency of this system compare to previously reported Minisci-type reactions?
This system achieves reaction rates of 40 mmol g_cat−1 h−1 under LED irradiation and 10.9 mmol g_cat−1 h−1 under natural sunlight. In contrast, previously reported photocatalytic Minisci-type reactions often require 5–48 hours for 0.2 mmol-scale reactions, translating to rates on the order of 0.004–0.04 mmol g_cat−1 h−1 (assuming typical catalyst loadings). Thus, this protocol offers a 1000-fold improvement in rate, enabling gram-scale synthesis in significantly shorter times.
What is the recycling stability of the catalyst and how does it affect industrial viability?
The catalyst demonstrates excellent recycling stability, as evidenced by successful reuse without significant loss of activity. While the paper does not specify the number of cycles, the stability is sufficient for gram-scale synthesis, indicating that the catalyst can be recovered and reused, reducing material costs and waste. This is crucial for industrial applications where catalyst longevity is a key economic factor.
What are the specific conditions for the Minisci-type cross-coupling reaction, and how do they contribute to the high efficiency?
The reaction is performed under LED irradiation or natural sunlight, using ultra-thin g-C3N4 as the photocatalyst. The high specific surface area (120 m2 g−1) enhances substrate adsorption, while the ultra-thin structure shortens charge migration distances, accelerating surface electron transfer. These factors collectively boost the photocatalytic efficiency, achieving high reaction rates under mild conditions without the need for stoichiometric oxidants or Ag catalysts.
What is the scalability potential of this photocatalytic system for industrial applications?
The reaction system was successfully scaled to gram-level, demonstrating its scalability. Combined with the high reaction rates (40 mmol g_cat−1 h−1 under LED) and the use of natural sunlight (10.9 mmol g_cat−1 h−1), this protocol offers a cost-effective and sustainable route for synthesizing N-heteroarene derivatives. The catalyst's stability and recyclability further enhance its industrial attractiveness, though further optimization of reactor design and light penetration may be needed for larger scales.
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