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Intriguing 1D single-walled metal–organic nanotubes (MONTs) Zn2(RR-CHCAIP)Py2(H2O) (HMOF-2) were successfully self-assembled using a semirigid homochiral ligand, 5,5′-((1R,2R)-cyclohexane dicarbonyl bis(azanediyl)) diisophthalic acid (RR-CHCAIP) with zinc salt, which was constructed from an organic ligand similar to the twin blades of a propeller with the Zn2(COO)4(H2O)(Py)2 cluster acted as the SBU, and the terminal pyridine auxiliary ligand capping at the Zn atoms played a key role in the formation of the 1D single nanotubes. The fluorescence of the HMOF-2 emulsion could be effectively quenched by D/L-lactic acid, D/L-tartaric acid enantiomers and D/L-alanine via hydrogen bonding interactions with the inwall of MONTs, which suggested this to be a remarkable chiral sensor for α-hydroxyl carboxylic acid and amino acid enantiomers with good sensitivity and enantioselectivity. Comparatively, HMOF-2 showed a negligible response towards D/L-mandelic acid and D/L-tyrosine, which chiefly arose from the confinement effect and the host–guest interaction of MONTs with the analytes. The construction strategy of MONTs based on the homochiral propeller-like ligand that bridges two metallic pillars will open new perspectives for developing self-assembling chiral MONTs with unique and practically useful enantioselective functions.

The design of white-light phosphors is attractive in solid-state lighting (SSL) and related fields. A new strategy in obtaining white light emission (WLE) from dual-way photon energy conversion in a series of dye@MOF (LIFM-WZ-6) systems is presented. Besides the traditional UV-excited one-photon absorption (OPA) pathway, white-light modulation can also be gained from the combination of NIR-excited green and red emissions of MOF backbone and encapsulated dyes via two-photon absorption (TPA) pathway. As a result, down-conversion OPA white light was obtained for RhB+ @LIFM-WZ-6 (0.1 wt %), BR-2+ @LIFM-WZ-6 (2 wt %), and APFG+ @LIFM-WZ-6 (0.1 wt %) samples under 365 nm excitation. RhB+ @LIFM-WZ-6 (0.05 wt %), BR-2+ @LIFM-WZ-6 (1 wt %) and APFG+ @LIFM-WZ-6 (0.05 wt %) exhibit up-conversion TPA white light under the excitation of 800, 790, and 730 nm, respectively. This new WLE generation strategy combines different photon energy conversion mechanisms together.