Syntheses and structures of three macrocyclic supramolecular complexes and one ZnII-containing coordination polymer generated from a semi-rigid multidentate N-containing ligand

Semirigid organic ligands can adopt different conformations to construct coordination polymers with more diverse structures when compared to those constructed from rigid ligands. A new asymmetric semirigid organic ligand, 4-{2-[(pyridin-3-yl)methyl]-2H-tetrazol-5-yl}pyridine (L), has been prepared and used to synthesize three bimetallic macrocyclic complexes and one coordination polymer, namely, bis(μ-4-{2-[(pyridin-3-yl)methyl]-2H-tetrazol-5-yl}pyridine)bis[dichloridozinc(II)] dichloromethane disolvate, [Zn2Cl4(C12H10N6)2]·2CH2Cl2, (I), the analogous chloroform monosolvate, [Zn2Cl4(C12H10N6)2]·CHCl3, (II), bis(μ-4-{2-[(pyridin-3-yl)methyl]-2H-tetrazol-5-yl}pyridine)bis[diiodidozinc(II)] dichloromethane disolvate, [Zn2I4(C12H10N6)2]·2CH2Cl2, (III), and catena-poly[[[diiodidozinc(II)]-μ-4-{2-[(pyridin-3-yl)methyl]-2H-tetrazol-5-yl}pyridine] chloroform monosolvate], {[ZnI2(C12H10N6)]·CHCl3} n , (IV), by solution reaction with ZnX 2 (X = Cl and I) in a CH2Cl2/CH3OH or CHCl3/CH3OH mixed solvent system at room temperature. Complex (I) is isomorphic with complex (III) and has a bimetallic ring possessing similar coordination environments for both of the ZnII cations. Although complex (II) also contains a bimetallic ring, the two ZnII cations have different coordination environments. Under the influence of the I− anion and guest CHCl3 molecule, complex (IV) displays a significantly different structure with respect to complexes (I)–(III). C—H...Cl and C—H...N hydrogen bonds, and π–π stacking or C—Cl...π interactions exist in complexes (I)–(IV), and these weak interactions play an important role in the three-dimensional structures of (I)–(IV) in the solid state. In addition, the fluorescence properties of L and complexes (I)–(IV) were investigated.

Fast deposition of an ultrathin, highly crystalline organic semiconductor film for high-performance transistors

A uniform and smooth Dif-TES-ADT film with thickness of ∼4.62 nm is achieved within 50 s in 2-inch size through the use of a mixed solvent system. The ultrathin Dif-TES-ADT film-based transistors exhibit a maximum mobility up to 5.54 cm2 V−1 s−1.

Effect of Temperature and Electrolytic Concentration on Density and Viscosity of Ethanol-Water Mixed Solvent Systems

The density and Viscosity of Ethanol-Water mixed solvent systems (5%, 10%, 20% ,40% v/v ) has been determined at 298,303,308 and 313 K. The same parameters has been determined for the KCl-Ethanol-Water mixture (2%, 4%, 6%, 8%, 10% w/v)The results obtained from these determinations were discussed. The effect of temperature and KCl electrolyte on density and viscosity of mixed solvent systems and mixture has been studied. The increase in temperature of mixed solvent system results in decrease in density and Viscosity. But with the addition of KCl electrolyte in mixed solvent system results in increase in density and viscosity at constant temperature but the same parameters decrease when temperature increases. The variation of these parameters is due to solute-solvent and solvent-solvent interaction.