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Comprehensive Summary: The organic cocrystal strategy has provided a convenient and efficient platform for preparing organic photothermal materials. However, the rapidly directional preparation of cocrystals with desirable photothermal properties remains challenging due to a lack of suitable design ideas. Here, two new photothermal cocrystals, MTC and MFC, based on acceptor molecules (TCNQ and F4TCNQ) with different electron‐withdrawing capacities were quickly prepared by the coprecipitation method, aiming to explore the effect of charge transfer (CT) interaction on photothermal properties. Compared with MTC, the stronger intermolecular CT interaction in MFC facilitates extending the absorption range (from the NIR‐I to the NIR‐II region) and enhancing the non‐radiative transition process. Under the 808 nm laser irradiation, the photothermal conversion efficiency (PCE) of MFC is 54.6%, whereas MTC displays a mere 36.8%. The MFC cocrystal was further combined with a flexible polymer substrate (HPDMS) to prepare a flexible wearable heater (HPDMS@MFC), which exhibits excellent NIR‐II photothermal performance. This work points out a research direction for the rapid assembly of efficient photothermal cocrystals and additionally provides an extensive application prospect for organic photothermal cocrystals in the field of wearable devices. [ABSTRACT FROM AUTHOR]

As an effective method to modulate the physicochemical properties of materials, crystal phase engineering, especially hetero‐phase, plays an important role in developing high‐performance photocatalysts. However, it is still a huge challenge but significant to construct porous hetero‐phase nanostructures with adjustable band structures. As a kind of unique porous crystalline materials, metal–organic frameworks (MOFs) might be the appropriate candidate, but the MOF‐based hetero‐phase is rarely reported. Herein, we developed a secondary building unit (SBU) regulating strategy to prepare two crystal phases of Ti‐MOFs constructed by titanium and 1,4‐dicarboxybenzene, i.e. COK and MIL‐125. Besides, COK/MIL‐125 hetero‐phase was further constructed. In the photocatalytic hydrogen evolution reaction, COK/MIL‐125 possessed the highest H2 yield compared to COK and MIL‐125, ascribing to the Z‐Scheme homojunction at hetero‐phase interface. Furthermore, by decorating with amino groups (i.e. NH2‐COK/NH2‐MIL‐125), the light absorbing capacity was broadened to visible‐light region, and the visible‐light‐driven H2 yield was greatly improved. Briefly, the MOF‐based hetero‐phase possesses periodic channel structures and molecularly adjustable band structures, which is scarce in traditional organic or inorganic materials. As a proof of concept, our work not only highlights the development of MOF‐based hetero‐phase nanostructures, but also paves a novel avenue for designing high‐performance photocatalysts. [ABSTRACT FROM AUTHOR]

The abnormal concentration of biological species is closely related to some physiological symptoms or diseases, and detecting these biological species is of great significance in clinical diagnosis and clinic treatment. Hence, the design and construction of high-performance biosensor have attracted lots of attention in recent decades. Due to the low cost, feasible operation, and other advantages, luminescence probes have been regarded as one of the effective and promising strategies for detecting biological species. Compared with single-emission luminescence probes, the ratiometric fluorescence probe shows self-calibration ability and hence possesses much better antijamming capability against the unstable light source, changeable concentration of probe material, experimental errors and so on. As for optimizing the detection performance, the key factor is the selection of probe materials to construct the ratiometric fluorescence biosensors. As the popular crystalline porous frameworks, metal-organic frameworks (MOF) and covalent organic frameworks (COF) possess diverse crystalline structures and adjustable luminescence properties, which realize the collection of analytes and adjustable luminescence emission. Hence, the MOF or COF based materials possess huge potential in practical applications for luminescence probes, and the corresponding ratiometric fluorescence probes have been developed a lot. Herein, we systematically review the constructing strategy, detecting mechanism, sensing applications (i.g. , biomolecules, biomarkers, drugs and others) for the MOF or COF based ratiometric fluorescence biosensing probes. In addition, the valuable references are provided for developing MOF or COF based ratiometric fluorescence probes to cater the requirements of environment monitoring and clinical diagnosis. • Due to the close relation to physiological symptoms or diseases, it is of great significance to detect the biological species in clinical diagnosis and clinic treatment. • For optimizing the detection performance, the key factor is the selection of probe materials to construct the ratiometric fluorescence biosensors. • Metal-organic frameworks and covalent organic frameworks possess diverse crystalline structures and adjustable luminescence properties, which realizes the collection of analytes and adjustable luminescence emission. • This work systematically reviews the constructing strategy, detecting mechanism, sensing applications for the MOF or COF based ratiometric fluorescence biosensing probes. [ABSTRACT FROM AUTHOR]