Record Aluminum Molecular Rings for Optical Limiting and Nonlinear Optics

Abstract

Crystalline cluster materials, a class of functional motif aggregations, provide a great opportunity for tuning the properties stemming from the flexible and accurate variation of inorganic and organic compositions. In this study, we demonstrate the effects of functional ligand and ring size regulation on the structures and third‐order nonlinear optical (NLO) properties. Revealed by the single‐crystal X‐ray analysis results, aluminum molecular ring expansion is achieved by 2×9 and 3×6 strategies. In terms of the given organic shells, we further tuned the aluminum molecular ring sizes from 3.0 nm to 1.7 nm. The picosecond Z‐scan measurements results revealed that the third‐order NLO performances do not only depend on the general conjugate interactions but are also related to hydrogen bonding, polarizability, and ring sizes. The large nonlinear absorption coefficient and onset prove that the observed samples are promising candidates for the field of nonlinear optics.

Water-stable porous Al24 Archimedean solids for removal of trace iodine

“…Based on the above considerations and our previous work on aluminum molecular rings 26 – 29 , we herein report the aggregation of the aluminum molecular rings into cationic core–shell Al 24 Archimedean solids and their performance in removing iodide from water. The Al 24 Archimedean solids consist of a pure-inorganic truncatedhexahedron ( tcu ) cage in the core together with six calixarene-like macrocyclic cavities.…”

Boosting the optical limiting properties of helicene-containing arene to the linear analogue

“…4 and S22), the nonlinear absorption coe cients (β eff ) and saturation absorption coe cient (I s ) at 30 µJ energy have been examined to be 17.69 cm/GW, 0.217 GW/cm 2 for 5, and 15.09 cm/GW and 0.35 GW/cm 2 for 8, respectively, being superior and close to some similar material previously reported. 49,50 The values of entering into the optical power limiting are 0.132 J/cm 2 for 5 and 0.29 J/cm 2 for 8., respectively (Fig. 4b and 4d).…”

Solvent-controlled synthesis of an Al12-oxo molecular ring and Al24-oxo truncated metallo-cube

“…31 For this dilemma, recently, a new strategy known as coordination delayed hydrolysis has been adopted by Zhang et al to synthesize a series of Al-oxo clusters by choosing monodentate carboxylic acid ligands and organic aluminium salts under solvothermal conditions. [32][33][34][35] Most of these Al-oxo clusters feature the structures of molecular rings from Al 8 to the largest Al 20 constructed using different large conjugated carboxylic acids. 33,34,36 The different peripheral ligands realize luminescence modulation of Al 20 molecular rings from blue to green.…”