Compared with fluorescence imaging utilizing fluorophores whose lifetimes are in the order of nanoseconds, time-resolved fluorescence microscopy has more advantages in monitoring target fluorescence. In this work, compound DCF-MPYM, which is based on a fluorescein derivative, showed long-lived luminescence (22.11 μs in deaerated ethanol) and was used in time-resolved fluorescence imaging in living cells. Both nanosecond time-resolved transient difference absorption spectra and time-correlated single-photon counting (TCSPC) were employed to explain the long lifetime of the compound, which is rare in pure organic fluorophores without rare earth metals and heavy atoms. A mechanism of thermally activated delayed fluorescence (TADF) that considers the long wavelength fluorescence, large Stokes shift, and long-lived triplet state of DCF-MPYM was proposed. The energy gap (ΔEST) of DCF-MPYM between the singlet and triplet state was determined to be 28.36 meV by the decay rate of DF as a function of temperature. The ΔE(ST) was small enough to allow efficient intersystem crossing (ISC) and reverse ISC, leading to efficient TADF at room temperature. The straightforward synthesis of DCF-MPYM and wide availability of its starting materials contribute to the excellent potential of the compound to replace luminescent lanthanide complexes in future time-resolved imaging technologies.

As trategy called ultramicroporous building unit (UBU) is introduced. It allows the creation of hierarchical biporous features that work in tandem to enhance gas uptake capacity and separation. Smaller pores from UBUs promote selectivity,w hile larger inter-UBUp acking pores increase uptake capacity.T he effectiveness of this UBUs trategy is shown with ac obalt MOF (denoted SNNU-45) in which octahedral cages with 4.5 pore sizeserve as UBUs.The C 2 H 2 uptake capacity at 1atm reaches 193.0 cm 3 g À1 (8.6 mmol g À1 ) at 273 Kand 134.0 cm 3 g À1 (6.0 mmol g À1 )at298 K. Suchhigh uptake capacity is accompanied by ahigh C 2 H 2 /CO 2 selectivity of up to 8.5 at 298 K. Dynamic breakthrough studies at room temperature and 1atm show aC 2 H 2 /CO 2 breakthrough time up to 79 min g À1 ,among top-performing MOFs.Grand canonical Monte Carlo simulations agree that ultrahigh C 2 H 2 /CO 2 selectivity is mainly from UBUultramicropores,while packing pores promote C 2 H 2 uptake capacity.

The conjugation of metal–organic frameworks (MOFs) into different multicomponent materials to precisely construct aligned heterostructures is fascinating but elusive owing to the disparate interfacial energy and nucleation kinetics. Herein, a promising lattice‐matching growth strategy is demonstrated for conductive MOF/layered double hydroxide (cMOF/LDH) heteronanotube arrays with highly ordered hierarchical porous structures enabling an ultraefficient oxygen evolution reaction (OER). CoNiFe‐LDH nanowires are used as interior template to engineer an interface by inlaying cMOF and matching two crystal lattice systems, thus conducting a graft growth of cMOF/LDH heterostructures along the LDH nanowire. A class of hierarchical porous cMOF/LDH heteronanotube arrays is produced through continuously regulating the transformation degree. The synergistic effects of the cMOF and LDH components significantly promote the chemical and electronic structures of the heteronanotube arrays and their electroactive surface area. Optimized heteronanotube arrays exhibit extraordinary OER activity with ultralow overpotentials of 216 and 227 mV to deliver current densities of 50 and 100 mA cm−2 with a small Tafel slope of 34.1 mV dec−1, ranking it among the best MOF and non‐noble‐metal‐based catalysts for OER. The robust performance under high current density and vigorous gas bubble conditions enable such hierarchical MOF/LDH heteronanotube arrays as promising materials for practical water electrolysis.

The high storage capacity versus high selectivity trade-off barrier presents ad aunting challenge to practical application as an acetylene (C 2 H 2 )a dsorbent. As tructureperformance relationship screening for sixty-two high-performance metal-organic framework adsorbents reveals that am oderate pore sized istribution around 5.0-7.5 is critical to fulfill this task. Aprecise pore space partition approach was involved to partition 1D hexagonal channels of typical MIL-88 architecture into finite segments with pore sizes varying from 4.5 (SNNU-26) to 6.4 (SNNU-27), 7.1 (SNNU-28), and 8.1 (SNNU-29). Coupled with bare tetrazole Nsites (6 or 12 bare Ns ites within one cage) as high-density H-bonding acceptors for C 2 H 2 ,the target MOFs offer agood combination of high C 2 H 2 /CO 2 adsorption selectivity and high C 2 H 2 uptake capacity in addition to good stability.T he optimizedS NNU-27-Fem aterial demonstrates aC 2 H 2 uptake of 182.4 cm 3 g À1 and an extraordinary C 2 H 2 /CO 2 dynamic breakthrough time up to 91 min g À1 under ambient conditions.