An integrated urea and halogen bond donor based receptor for superior and selective sensing of phosphates

Abstract

An integrated urea and halogen bond donor based receptor is utilized for selective and superior sensing of phosphates.

Advances in fluorescent and colorimetric sensors for anionic species

“…They may be used for sensing when the addition of an anionic species results in a disruption of this geometry and/or induces a change in optical properties [71]. Recent examples have detected anions either via coordination and interaction directly with the metal centre [72][73][74][75], or by inducing changes in the coordination environment by binding to a ligated organic group [76][77][78][79][80].…”

Facile and Reliable Emission‐Based Nanomolar Anion Sensing by Luminescent Iridium Receptors Featuring Chelating Halogen‐Bonding Sites

“…Notably,t he contributiono fa2:1s pecies is too small, because the concentrations in the emission experiments are one order of magnitude lower.M ore importantly,t hese K a values are on the same order as the high ones reported for relatedr otaxanes and bis-N-alkylated congeners [7b, 8b] or as pecific phosphate sensor (vide supra). [22,23]…”

“…utilized a related Ru II complex for phosphate sensing, which exemplified the superiority of XB‐based sensors ( K a up to 5.6×10 4 m −1 , LOD=18 n m ) over the HB analogues (LOD=50 n m ) [22] . Recently, an additional increase in anion binding by 50 % was reported for the XB sensor when augmented with further HB‐based moieties [23] . Interestingly, alternative anions lead to substantially lower K a values, attributed to the exceptional interaction of polyphosphate‐based anions.…”

“…[22] Recently,a na dditional increasei n anion binding by 50 %w as reported for the XB sensor when augmented with further HB-based moieties. [23] Interestingly,a lternative anionsl ead to substantially lower K a values, attributed to the exceptional interaction of polyphosphate-based anions. In their most recent extension of the phosphate-specific aggregation phenomena, Ghosh et al incorporated ap yrene signaling unit, leading to am aximized quantum yield of 3% on aggregation.…”

Anion recognition by halogen bonding and hydrogen bonding bis(triazole)-imidazolium [2]rotaxanes

“…[10][11][12] In more recent years, iodo-triazoles have emerged as synthetically accessible and highly potent XB donors, and accordingly have received intense interest in the field of anion recognition. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] Herein we report a novel, potentially synergistic mixed XB/HB anion recognition motif, comprising of a central imidazolium unit with two adjacent iodotriazole groups (Figure 1). The receptor design exploits a bidentate XB donor array connected via flexible methylene linkers to a charge-assisted C--H HB donor.…”