Beadwork and Network: Strings of Silver Ions Stitch Large-π Pyrazolate Patches into a Two-dimensional Sheet

Abstract

Breaking the cycle of silver pyrazolates: instead of the common loops (e.g., the Ag3N6 ring), we report an infinite array in which the equispaced Ag­(I) ions form a zigzag chain, with the associated anthracene bis­(pyrazolate) linkers cofacially aligned one to another. In addition to the strong Ag­(I)–N bonds and the distinct argentophilic interactions, the Ag­(I) ions also form interlayer, metal−π contacts with the anthracene cores. The resultant two-dimensional network exhibits significant electronic interaction between the Ag­(I) centers and the large aromatic linker molecule, as revealed by the red shift of photoemission spectra and the significant reduction of the electronic band edge as determined by diffuse reflectance spectroscopy. The solid sample is stable in air and water.

First Example of a Nonanuclear Silver Sulfate Hybrid Cluster: Green Approach for Synthesis of Lewis Acid Catalyst

“…Ag–Ag bonds are in the range of 2.389(7)–3.315 (2) Å (av. Ag–Ag = 2.953 Å) which is comparable with the earlier literature. − There are four sulfate units with average S–O bond distances of 1.443 Å. The sulfate unit possesses an average angle of 109.4°, which is indicative of a regular tetrahedral arrangement.…”

“…Such Ag•••Ag interactions are more significant for silver-based framework materials. 42,43 Beside the silver sulfate compounds, Jin et. al have also communicated one octanuclear Ag 8 -cluster stabilized with adamentanedicarboxylic acid.…”

“…All the silver sulfate compounds above have weak argentophilic interactions with Ag–Ag distances above 3.00 Å. Such Ag···Ag interactions are more significant for silver-based framework materials. , Beside the silver sulfate compounds, Jin et. al have also communicated one octanuclear Ag 8 -cluster stabilized with adamentanedicarboxylic acid .…”

Combined experimental and theoretical studies of conformationally diverse (thio)semicarbazone-based semiconducting materials

“…Moreover, the twisted structure prevents the formation of a trap for the charge carriers and facilitates the conductivity. 53,54 In the present study, the shortest π⋯π contact was observed in 2 as 3.219 Å compared to 3.315 Å in 1, indicating that the former should show better conductivity. However, the zig-zag type hydrogen-bonded layered structure in 1 compared to the almost planer H-bonded sheet structure in 2 may reduce the trapping time of the charge carriers, making 1 a better semiconducting material.…”

Solvent-Induced Polymorphism in a Schiff Base Compound and Their Distinguishing Effects on Semiconducting Behaviors for Utilization in Photosensitive Schottky Devices

“…The shorter the separation in the molecular stacking, the higher the conductivity of the materials. Additionally, the twisted structure helps to prevent the formation of charge carrier traps and hence enhances conductivity by reducing holding time. , In the present case, polymorph I exhibits the shortest π···π contact of 3.322 Å, whereas polymorph II has a slightly longer separation of 3.491 Å, suggesting that polymorph I may display better conductivity. However, the tilted molecular plane in polymorph II , compared to the nearly planar molecule in polymorph I , reduces the trapping time of the charge carriers, thereby making polymorph II a superior semiconducting material.…”