Regulating structural dimensionality and emission colors by organic conjugation between Sm-III in at a fixed distance

摘要

The conjugation of bridging bis(diphenylphosphine oxide) alkane or arene ligands was found to control the structural dimensionality and the emission color of complexes from reactions with Sm-III(hfac)(3)(H2O)(2) (hfac(-) = hexafluoroacetylacetonato) while retaining the Sm center dot center dot center dot Sm distances. Bis(diphenylphosphine oxide)1,4-butane (Li) affords a one-dimensional (1D) ribbon (Sm(hfac)(3)(L1)}(infinity) (1) that emits red color, while bis (diphenyl-phosphinoyl)-1,4-benzene (L2) results in a two-dimensional (2D) network (Sm(hfac)(2)(CF3COO) (L2)(3))(infinity) (2) and near-white emission, but bis(diphenyl-phosphinoyl)-9,10-anthracene (L3) forms a zero-dimensional (OD) cyclic structure (Sm(hfac)(3)(L3)}(2) (3) with strong pi center dot center dot center dot pi interactions that emit green color. Noticeably, the conjugation change is accompanied by a configurational change of coordination from trans for 1 and 2 to cis for 3. The color change is associated with the superposition of ligand and Sm based electronic band energies and their Intensities. Such white light emission by a single compound having contributions from different building components is quite rare.