Recently, we reported on the bistable configurational switching of dibenzo[a,h]thianthrene (DBTH) molecules adsorbed on NaCl using combined low‐temperature scanning tunneling and atomic force microscopy (STM/AFM). Here, we discuss the intra‐molecular contrast in AFM images of the molecules as ...
A series of rhenium(I) complexes (1–4) with substituted dipyrido[3,2-a:2′,3′-c]phenazine (dppz) ligands were synthesized and analyzed as electrocatalysts for CO2 reduction. Cyclic voltammetry study shows that complexes 1–4 exhibit dppz ligand-based and metal center-based quasi-reversible red...
A mononuclear Ru(II) complex based on a new heptacyclic ligand (dpqp) has been prepared and characterized by NMR spectroscopy, ES mass spectrometry and electrochemistry. It forms dimers and aggregates of up to seven complex units in CH 3 CN solution observed by ESMS. The monomer has an e...
Three new α,α′-diimine ligands were synthesized based on condensation of 1,10-phenanthroline-5,6-dione with 1,2-phenylenediamine derivatives using different approaches. All compounds were fully characterized by IR, 1 H and 13 C NMR, UV–visible, and MS spectroscopies. We repor...
Behavior of 4-amino-1-dimethylamino- and 1-amino-4,5-bis(dimethylamino)naphthalenes sharply differs on their treatment with tosyl chloride and oxidation with the ButOK/O2 system. While the former upon the action of tosyl chloride in protic media is transformed to sulfonamide, the latter unexpect...
We report here an alternative to the MCPBA or ozonolysis-based oxidation methods of quinoxaline-featuring compounds prepared from beta-lapachones. The use of peracetic acid allowed a simple preparation of the corresponding macrolactones by cleavage of the ring system. These lactones were evaluat...
Four novel styryl—dihydrobenzo[a]phenazine chromophores have been synthesized and spectroscopically characterized. They respond to acids and bases through changes in absorption resulting in strong bathochromic shift (>437 nm). The emission quantum yields of the dyes were in the range 0.11–0.14...
An efficient and green strategy for the improved synthesis of a biologically and pharmaceutically interesting multi‐functionalized diverse novel spiro‐benzo[a]phenazine annulated heterocycles was developed with the assistance of microwave irradiation. A sequential one‐pot, two‐step domino re...
Two red emitting iridium complexes (DBA) 2 Ir(acac) and (BA) 2 Ir(acac) (DBA=5,6-dihydro-benzo[c]acridine, BA=benzo[c]acridine, acac=acetylacetone) were synthesized. Organic light-emitting devices using these complexes as dopant emitters have been fabricated. The results showed t...
Boron nitride nano material based solid acid catalyst was found to be an efficient and reusable sulfonic acid catalyst for the synthesis of one-pot Knoevenagel and Michael type reactions in 3, 3-dimethyl-9-(2-(4-methylpiperazin-1-yl) quinolin-3-yl)-3, 4, 9, 10-tetrahydroacridin-1(2H)-one derivat...
A new family of thermally activated delayed fluorescence (TADF) emitters based on U‐shaped D‐A‐D architecture with a novel accepting unit has been developed. All investigated compounds have small singlet‐triplet energy splitting (ΔEST) ranging from 0.02 to 0.20 eV and showed efficient TADF ...
New molecular receptors with dibenz[c,h]acridine skeleton bearing functional groups complementary to malonic acids have been developed. Dibutylmalonic acid is bound in chloroform with Kass values between 10 2 and 10 5 M - 1 via hydrogen-bonding interactions. The cata...
N-Heterocyclic polynuclear aromatics are widely-occurring environmental pollutants formed during the pyrolysis of nitrogen-containing organic chemicals. Dibenz[a,j]acridine (DBA), a member of this class, has been shown to be a skin carcinogen in mice. We undertook studies to determine the orga...
The [2+2+2] cycloaddition reaction of 1,6-diynes 3 with 4-aryl-2-butyn-1-ols 4 and the following oxidation of the resulting benzylic alcohols to the aldehydes 1 and then treatment with an acid catalyst provided annulated anthracenes 2 in good yields.
Condensation between 7-(1,1-dimethylethyl)-13-phenyl-8H-indeno[2,1-b]phenanthrene and paraformaldehyde produced the corresponding 9-fluorenylmethanol derivative, which on treatment with P 2 O 5 to promote a Wagner–Meerwein rearrangement for ring expansion furnished 14-phenyldibe...
The synthesis of 2,3-dihydro-1H-indeno[5,4-a]anthracene (2), the fluoreno[a]anthracenes 3 and 4, 2,3-dihydro-1H-cyclopenta[a]chrysene (6), 3,4-dihydro-2-vinylphenanthrene (10) and cyclopenta[c]chrysenes 11, 12 has been described. Structure analysis of the new products by 1 H and 13 ...
In the present work the low-frequency vibrations of cyclopentaphenanthrene derivatives have been studied by THz-TDS and Raman spectroscopy in the temperature range 20–300 K. All observed bands were assigned using DMol3 simulations. The effect of hydrogen bonds on spectra is discussed.
The introduction of electron-donating groups on the skeleton of a naphthopyran, 3,3-diphenyspiro[benzofluorenopyran-cyclopentaphenanthrene], has led to the development of a photochromic dye applicable to photochromic lenses. Introducing a methoxy group to C6 moved the absorption band of the MC f...