Spectroscopy of charge transfer complexes of four amino acids as organic two-dimensional conductors

Abstract

It is found in this study that four amino acids, namely asparagine, arginine, histidine and glutamine form two-dimensional conducting systems which are charge transfer complexes (CTCs) with organic acceptors like TCNQ, TCNE, chloranil, DDQ, TNF and iodine. It is verified using optical absorption edges that these are 2d conductors like transition metal dichalcogenides obeying absorption functions different from 1d and 3d conductors. This 2d nature is related to the network of intermolecular H-bonding in these complexes, which leads to a global H-bonded network resulting in the absence of local deformation due to the relaxation of strain.

(Pro2H+)2(TCNQ.−)2⋅TCNQ: An Amino Acid Derived Semiconductor

“…Unlike the typical cationic TCNQ complexes, amino acids are not obvious candidates for TCNQ CT complexes. However, there is one report whereby solid TCNQ was ground with four different amino acids with the formation of a CT product indicated by IR spectroscopy 16…”

(Pro2H+)2(TCNQ.−)2⋅TCNQ: An Amino Acid Derived Semiconductor

“…However, there is one report whereby solid TCNQ was ground with four different amino acids with the formation of a CT product indicated by IR spectroscopy. [16] Here we report the preparation and characterization of a novel bioorganic TCNQ material (Pro 2 H + ) 2 -(TCNQC À ) 2 ·TCNQ (ProTCNQ), formed as a CT compound between neutral l-proline and TCNQ. Water was found to be necessary to provide the proton and the redox balance achieved through the oxidation of water (see Supporting Information, Section S3).…”

Simultaneous electricity production and removal of organics from synthetic wastewater in a continuous membrane less MFC: Effects of process parameters

“…Thereafter, the inter electrode (anode) distance was further varied by changing the position of the anode (25,40, and 55 cm from the bottom of anode chamber) with fixed cathode position. To study the effect of mediator concentration, methyl blue was used and its concentration was varied from 0.1 to 0.5 mM.…”

“…To study the effects of inter electrode distance first anode was fitted at the top of the anodic portion of the column MFC (55 cm from the bottom of the anodic chamber) and cathode was varied to maintain the variable distance of 10, 20, 30, and 40 cm between cathode and anode. Thereafter, the inter electrode (anode) distance was further varied by changing the position of the anode (25,40, and 55 cm from the bottom of anode chamber) with fixed cathode position. To study the effect of surface area of anode on voltage generation three anodes were used at a time in the above positions and with the single cathode placed at 75 cm from the bottom of anodic chamber.…”