Synthesis and Electron Transport Properties of Some New 4,7-Phenanthroline Derivatives in Thin Films

Abstract

Temperature-dependent d.c. electric conductivity of some recently synthesized organic compounds, 4,7-phenanthroline derivatives is studied. Thin-film samples (d=0.34-0.63 m) spin-coated from dimethylformamide solutions onto glass substrates have been used. Organic films with reproducible electron transport properties can be obtained if, after deposition, they are submitted to a heat treatment within temperature range of 298523K. Examined organic compounds in thin films are polycrystalline and display typical n-type semiconductor behavior. The activation energy of d. c. electric conduction ranges between 0.09 and 0.46 eV and is influenced by nature of substituents, degree of conjugation systems and packing capacity of compounds. In the higher temperature range (T>433 K), the electron transport in examined compounds can be interpreted in terms of the band gap representation model, while in the lower temperature range, the Mott's variable-range hopping conduction model was found to be appropriate. Some of the investigated compounds hold promise for thermistor applications.

Synthesis of New Zinc and Copper Coordination Polymers Derived from Bis (Triazole) Ligands

“…As a continuation of our interest in the field of N-heterocycles (synthesis and properties of novel compounds containing nitrogen [21][22][23] and fast and facile synthesis herein we present the synthesis and characterization of two new linkers, namely 1,1 ′ -(3,3 ′dimethoxy-[1,1 ′ -biphenyl]-4,4 ′ -diyl)bis(4-butyl-1H-1,2,3-triazole) and 1,1 ′ -(3,3 ′ -dimethoxy-[1,1 ′ -biphenyl]-4,4 ′ -diyl)bis(4-phenyl-1H-1,2,3-triazole), as well as the preparation of their coordination polymers with Cu(II) and Zn(II).…”

Synthesis and properties of new fused pyrrolo-1,10-phenanthroline type derivatives

“…As a continuation of our dedicated research focused on phenanthrolines fused systems [27][28][29][30] and as part of our concern in the field of biologically active compounds, [31][32][33][34][35] the purpose of our present study was to synthesize new 1,10phenanthroline derivatives having one of its N-atoms locked in order to ensure a potential bio-activity (by maintaining the rings coplanarity and reducing the toxicity due to N-atoms internal chelating propensity). Thus, we report herein the synthesis, structure, fluorescence and the in vitro antimicrobial evaluation of several new 1,10-phenanthroline derivatives.…”

Design, Synthesis, Molecular Modelling and Anticancer Activities of New Fused Phenanthrolines

“…Phenanthrolines are versatile moieties which have found use in many applications [1][2][3] due to a wide variety of interesting properties (complexation [1][2][3], luminescence [1,2,4], biological activities [4][5][6][7], semiconductors [8][9][10]). These polycyclic compounds are also naturally occurring in morphine alkaloids, sterols or hormones [11], which makes the phenanthroline scaffold an excellent choice in the generation of unique bioactive compounds.…”

“…For example, substituted benzo[c]phenanthroline analogues of nitidine and fagaronine showed cytotoxic properties associated with DNA intercalation and induced G2/M phases arrests [12]. Synthetic pyrido [1,8] or [1,9] phenanthroline analogues of amphimedine exhibited cytotoxic activities in various cancer cell lines [13,14]. Recently, our group also reported several fused pyrrolo [1,7] or [4,7] phenanthrolines which showed moderate antiproliferative activity [15][16][17].…”