A single-armed salamo-based fluorescence sensor QANS was designed and synthesized. QANS exhibited aggregation-induced emission (AIE) property in a binary solvent mixture (DMF/H2O) as the water content increased, and the QANS powder showed strong orange-yellow emission in solid state. In addition to the intriguing AIE characteristic, QANS demonstrated high selectivity and sensitivity for Al3+ over various metal ions through a “turn-on” fluorescence response. A plausible mechanism for the interaction of sensor QANS with Al3+ was proposed according to the ESI-MS, Job’s plot, 1H NMR titration analysis and DFT calculations. Furthermore, the sensor QANS was applied in monitoring Al3+ in actual water samples. To further determine its applicability, the convenient paper strips of QANS were applied for selective monitoring of Al3+ ions. 

A new single-armed salamo-based sensor with aggregation-induced emission characteristic for selective sensing of aluminium ions

Experimental and theoretical investigation of a new non-symmetric salamo-like ligand and its tri-nuclear Zn(II) and Ni(II) complexes

Structural, theoretical and optical investigations of two lateral twisting trinuclear Co(II) and Ni(II) salamo type complexes

Abstract Two unexpected tetranuclear supramolecular boxes, [Zn4(L')4(CH3OH)2]·2CH3OH (1) and [Co4(L)2(L')2(CH3OH)2]·acetone (2), with M4(μ3-O)2(μ2-O)4 core were obtained through reacting coumarin Schiff base H2L (H2L = 4-hydroxy-3-((2-hydroxyphenyl-imino)-methyl)-2hchrome-2-one) with Zn(OAc)2·4H2O and Co(OAc)2·4H2O, respectively. Interestingly, the original ligand (H2L) has changed into a new structure (H2L') in the process of forming single crystals. The structures of 1 and 2 were characterized by X-ray single crystal diffraction. 1 and 2 are tetranuclear structures including four metal centers (Zn(II) or Co(II)), four completely deprotonated ligands (four new (L')2- in 1, two original (L)2- and two new (L')2- in 2), two coordinated methanol molecules and several crystalline solvent molecules. Significantly, due to the action of Zn(II) and Co(II), the original Schiff base H2L completely changed from coumarin skeleton to quinoline skeleton to form a new ligand (H2L') in 1, while in 2 half of the ligands H2L involved in coordination changed to H2L' configuration, the other half maintained the original structure. In 1, Zn1 ions are six-coordinate octahedral configuration and Zn2 are five-coordinate distorted square-pyramidal configuration with τ = 0.38. In 2, Co1 are six-coordinate octahedral configuration and Co2 are five-coordinate triangular bipyramidal configuration with τ = 0.66. Graphical Abstract

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Synthesis, crystal structure and coordination behaviors of two unexpected tetranuclear Zn(II) and Co(II) supramolecular boxes derived from structural variation of coumarin schiff base ligand

Abstract Two structurally different Cu(II) and Co(II) complexes, [Cu(L)] (1) and [Co2(L)2]⋅2CH3OH (2), constructed from a new polyhalogen-substituted unsymmetric salamo-based ligand (H2L, 4-chloro-4′-bromo-6-bromo-6′-tert-butyl-2,2′-[ethylenedioxybis(nitrilomethylidyne)]diphenol) were synthesized by wet-chemical methods. Complexes 1 and 2 were characterized through elemental analyses, IR and UV-vis spectroscopies and single crystal X-ray crystallography. In addition, the differences of the structures, electronic absorption characteristics and fluorescence property transitions from the ligand to complexes 1 and 2 were studied. The largest difference is that the ligand H2L can react with M(OAc)2 (M = Cu(II) and Co(II)) to give two complexes with distinct structures and behaviors. There are two chemically identical but crystallographically independent structural units (molecules A and B) in 1. Moreover, each Cu(II) ion (Cu1 or Cu2) is four-coordinate and possesses a square planar geometry, but both Co(II) ions of 2 are bridged by phenoxide ions and possess five-coordinate trigonal bipyramidal configurations. At the same time, Hirshfeld surface analyses showed there are short-range interaction features from the ligand to complexes 1 and 2, the O···H/H···O interactions of the ligand are significantly stronger than those of 1 and 2. Graphical abstract

https://figshare.com/articles/journal_contribution/Differential_study_on_the_transition_from_a_new_polyhalogen-substituted_unsymmetric_salamo-based_ligand_to_its_Cu_II_and_Co_II_complexes/21178492

Ying Huang

Papers

Counteranion-driven self-assembly of di- and tetra-nuclear Zn(II) single‐armed salamo‐type complexes

Experimental and theoretical investigation of a new non-symmetric salamo-like ligand and its tri-nuclear Zn(II) and Ni(II) complexes

Structural, theoretical and optical investigations of two lateral twisting trinuclear Co(II) and Ni(II) salamo type complexes

A dual-channel chemosensor based on 2-hydroxy-5-methyl-1,3-benzenedialdehyde for fluorescence detection and colorimetric recognition of glutamic acid

A novel double-armed salamo-based probe for highly selective fluorescence detection of tryptophan and Al3+