RESUMEN
Solution Gated Graphene Field-Effect Transistors (SGGT) are eagerly anticipated as an amplification platform for fabricating advanced ultra-sensitive sensors, allowing significant modulation of the drain current with minimal gate voltage. However, few studies have focused on light-matter interplay gating control for SGGT. Herein, this challenge is addressed by creating an innovative photoelectrochemical solution-gated graphene field-effect transistor (PEC-SGGT) functionalized with enzyme cascade reactions (ECR) for Organophosphorus (OPs) detection. The ECR system, consisting of acetylcholinesterase (AChE) and CuBTC nanomimetic enzymes, selectively recognizes OPs and forms o-phenylenediamine (oPD) oligomers sediment on the PEC electrode, with layer thickness related to the OPs concentration, demonstrating time-integrated amplification. Under light stimulation, the additional photovoltage generated on the PEC gate electrode is influenced by the oPD oligomers sediment layer, creating a differentiated voltage distribution along the gate path. PEC-SGGT, inherently equipped with built-in amplification circuits, sensitively captures gate voltage changes and delivers output with an impressive thousandfold current gain. The seamless integration of these three amplification modes in this advanced sensor allows a good linear range and highly sensitive detection of OPs, with a detection limit as low as 0.05 pm. This work provides a proof-of-concept for the feasibility of light-assisted functionalized gate-controlled PEC-SGGT for small molecule detection.
RESUMEN
The asymmetric unit of the title compound, [Cd(C(8)H(4)O(4))(C(17)H(8)ClN(5))(H(2)O)](n), contains one Cd(II) atom, two half benzene-1,4-dicarboxylate (1,4-bdc) anions, one 11-chloropyrido[2',3':2,3]pyrimidino[5,6-f][1,10]phenanthroline (L) ligand and one coordination water molecule. The 1,4-bdc ligands are on inversion centers at the centroids of the arene rings. The Cd(II) atom is six-coordinated by two N atoms from one L ligand, three carboxylate O atoms from two different 1,4-bdc ligands and one water O atom in a distorted octahedral coordination sphere. Each Cd(II) center is bridged by the 1,4-bdc dianions to give a one-dimensional chain. Pi-pi stacking interactions between L ligands of neighboring chains extend adjacent chains into a two-dimensional supramolecular (6,3) network. Neighboring (6,3) networks are interpenetrated in an unusual inclined mode, resulting in a three-dimensional framework. Additionally, the water-carboxylate O-H...O hydrogen bonds observed in the network consolidate the interpenetrating nets.
RESUMEN
The title cobalt(II) coordination polymer, poly[[diaquacobalt(II)]-mu4-3,3'-(p-phenylene)diacrylato], [Co(C12H8O4)(H2O)2]n, was obtained by reaction of Co(NO3)(2).6H2O and 3,3'-(p-phenylene)diacrylic acid (H2L) under hydrothermal conditions. Each Co(II) cation sits on a centre of inversion and is hexacoordinated by six O-atom donors in an octahedral geometry. The Co(II) centres are connected by four centrosymmetric L2- anions, resulting in a three-dimensional framework structure. The coordinated water molecules and carboxylate O atoms form hydrogen-bond interactions, stabilizing the structure of the three-dimensional framework. Topologically, the framework represents a rare example of the three-dimensional 4-connected CdSO4 network type. The metal cations and the organic ligand both show in-plane coordination with respect to the extended structure.
RESUMEN
In the title cadmium(II) coordination polymer, poly[tri-mu(4)-adipato-bis(2-phenyl-1H-1,3,7,8-tetraazacyclopenta[l]phenanthrene-kappa(2)N(7),N(8))tricadmium(II)], [Cd(3)(C(6)H(8)O(4))(3)(C(19)H(12)N(4))(2)](n), one of the Cd atoms is in a distorted pentagonal bipyramidal coordination environment, surrounded by five O atoms from three adipate (adip) ligands and two N atoms from one 2-phenyl-1H-1,3,7,8-tetraazacyclopenta[l]phenanthrene (L) ligand. A second Cd atom occupies an inversion center and is coordinated by six O atoms from six adip ligands in a distorted octahedral geometry. The carboxylate ends of the adip ligands link Cd(II) atoms to form unique trinuclear Cd(II) clusters, which are further bridged by the adip linkers to produce a two-dimensional layer structure. Topologically, each trinuclear Cd(II) cluster is connected to four others through six adip ligands, thus resulting in a unique two-dimensional four-connected framework of (4,4)-topology. This work may help the development of the coordination chemistry of 1,10-phenanthroline derivatives.
RESUMEN
The title cadmium(II) coordination polymer, [Cd(2)(C(4)H(2)O(4))Cl(2)(C(19)H(12)N(4))(2)](n), (I), was obtained by the reaction of CdCl(2) x 2.5 H(2)O, fumaric acid (H(2)fum) and 2-phenyl-1H-1,3,7,8-tetraazacyclopenta[l]phenanthrene (L) under hydrothermal conditions. The fum dianion is situated across an inversion centre in the space group P1. The Cd(II) atom is six-coordinated by two L N atoms, two fum O atoms and two Cl atoms in a distorted octahedral geometry. The mu(2)-Cl atoms and the bis-chelating fum dianions bridge neighbouring Cd(II) centres, yielding a coordination polymer chain structure along the c axis. N-H...O hydrogen bonds between the N atoms of L and the carboxylate O atoms of fum lead to a sheet structure in the bc plane. Compound (I) represents a rare example of a supramolecular structure constructed by a chloride anion, a dicarboxylate anion and a 1,10-phenanthroline derivative. This work may further the development of the coordination chemistry of 1,10-phenanthroline derivatives.
