From helices to superhelices: hierarchical assembly of homochiral van der Waals 1D coordination polymers

Abstract

Chiral transcription from the molecular level to the macroscopic level by self-organization has been a topic of considerable interest for mimicking biological systems. Homochiral coordination polymers (CPs) are intriguing systems...

Enhancing the Circularly Polarized Luminescence of Europium Coordination Polymers by Doping a Chromophore Ligand into Superhelices

“…Figure b shows the PXRD patterns of S -Eu- n ( n = 0–5%). All display peaks at 5.7, 10.0, 11.7, and 15.6°, identical to the pattern for the previously reported helical compound S -Tb­(cyampH) 3 ·3H 2 O . The IR spectra of S -Eu- n ( n = 0–5%) are also similar to those of S -Tb­(cyampH) 3 ·3H 2 O except for the additional peaks at 3051 and 1513 cm –1 for S -Eu- n ( n = 1–5%) (Figure S2), assigned to the C–H and CC stretching vibration bands from naphthyl groups.…”

“…The IR spectra of S -Eu- n ( n = 0–5%) are also similar to those of S -Tb­(cyampH) 3 ·3H 2 O except for the additional peaks at 3051 and 1513 cm –1 for S -Eu- n ( n = 1–5%) (Figure S2), assigned to the C–H and CC stretching vibration bands from naphthyl groups. The results indicate that both S -cyampH 2 and S -nempH 2 ligands are involved in the coordination with Eu III ions in the doped samples, and the structures of S -Eu- n ( n = 0–5%) are identical to that of S -Tb­(cyampH) 3 ·3H 2 O, where the Eu III ions are bridged by μ-O­(P) and O–P–O units into an infinite chain and each Eu III is surrounded by eight phosphonate oxygen atoms (Figure d).…”

“…As a proof-of-concept of this doping strategy, we selected Eu III salt to react with enantiopure S - or R -(1-cyclohexylethylamino)­methylphosphonic acid (cyampH 2 ) in the presence of a small amount of S - or R -(1-naphthylethylamino)­methylphosphonic acid (nempH 2 ). The Eu/cyampH 2 system was chosen because it can readily form one-dimensional (1D) coordination polymers of S - or R -Eu­(cyampH) 3 ·3H 2 O ( S / R -Eu-0% ) with a helical morphology over a wide pH range (4.3–6.5) . Moreover, S / R -Eu-0% are CPL-inactive and show low quantum yields (Φ lum = 3.2%).…”

Effect of Pd(ii) uptake on high-temperature phase transitions in a hybrid organic–inorganic perovskite semiconductor

“…1–10 As crystalline materials derived from organic and inorganic components, HOIPs have been extensively investigated for their fascinating and intriguing properties and functionalities. 11–22 Among them, perovskite-type hybrids with the general chemical formula ABX 3 (A = organic cation, B = divalent metal and X = anion) have drawn increasing attention due to their excellent physical properties and practical applications in structural phase transitions, electricity, magnetism, luminescence and solar cells. 23–29 According to previous studies, hybrid organic–inorganic ABX 3 perovskites can be crystallized in two structural forms, one adopts the same structure as the inorganic ABX 3 perovskite CaTiO 3 , including a three-dimensional BX 3 framework with corner-sharing octahedra, where B = Pb( ii ), Sn( ii ), X = halide and A = methylammonium, 30,31 formamidinium, 32 methylhydrazinium 33,34 and aziridinium.…”

Red room temperature phosphorescence of lead halide based coordination polymer showing efficient angle-dependent polarized emission and photoelectric performance

“…1–5 In this field, the huge selection and combination of rich metal ions, organic ligands and guest molecules/ions/nanoparticles enable CPs/MOFs to be a highly versatile and tunable platform for the fabrication of desired functional materials. 6–10 Recently, apart from the widely reported single state CPs/MOFs, studies on the triplet state of these materials have received tremendous attention owing to their fascinating photophysical phenomenon and various applications. 11 It is well recognized that the binding metal ions or clusters can provide a more rigid environment to suppress the non-radiative decay of triplet excitons and facilitate long-lasting phosphorescence emission at room-temperature.…”