This report describes the synthesis, crystal structures, 3 ·3CH 3 OH·1.5H 2 O (2), where H 2 L is [1+1] condensation product of 3-methoxysalicylaldehyde and 2-amino-2-methyl-1-propanol. The heptametallic cores in 1 and 2 may be taken as consisted of two symmetry related trinuclear Co III Ln III Co III moieties and a central lanthanide center in such a way that each of the three metal ions of each of the two trinuclear moieties are bridged with the central lanthanide through bridging oxo/alkoxo/acetate ligands. DC [a]

In this work, we designed a new boronic ester based ditopic Schiff's base receptor, 2,2′‐(((1E,1′E)‐((2,4,8,10‐tetraoxa‐3,9‐diboraspiro[5.5]undecane‐3,9‐diyl)bis(4,1‐phenylene)) bis(me‐thanylylidene))bis(azanylylidene))diphenol (H2L)by condensing ortho‐aminophenol, 4‐formyl phenyl boronic acid and pentaerythritol. The receptor has been thoroughly characterized by 1H, 13C, 11B NMR spectroscopy as well as high resolution mass spectroscopy and by elemental analyses. Hydrolytic stability of the receptor was also checked by recording its 1H NMR spectrum in mixed DMSO‐d6 and D2O solvent. The receptor acts as highly selective and sensitive probe for the detection of Cu2+ and F– among the studied ions in solution. Both anion and cation sensing studies were thoroughly investigated through multiple optical channels such as UV‐vis absorption and steady state and time‐resolved emission spectroscopic techniques. Among the studied anions, only F– induces color and absorption and emission and time‐resolved emission spectral changes in dimethylsulphoxide.Addition of Cu2+ ion to the solution of the receptor in dimethylsulfoxide‐water (5:2 v/v) leads to remarkable color and absorption spectral changes. Association constants of the receptor towards F– have been also evaluated from the absorption/emission titration data.

In the five ZnII2LnIII2 compounds – (i) the TbIII and ErIII analogues show slow relaxation of the magnetization, while the HoIII system and, surprisingly, the DyIII analogue don’t; (ii) the GdIII system shows the MCE; and (iii) interestingly, the Ln–O bond length increases with the increase of atomic number.

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