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Ion A.E.,University of Bucharest | Nica S.,C D Nenitzescu Of The Romanian Academy | Madalan A.M.,University of Bucharest | Lloret F.,University of Valencia | And 2 more authors.
CrystEngComm | Year: 2013

Three new complexes have been obtained using C3-symmetric trinuclear complexes as tectons; [Cu3(felden)(NCS) 3(dmf)3] (1), [Cu3(felden)(mand) 3]·(C2H5)2O (2), and [Cu 3(felden)(dca)3(C2H5OH)] ·2H2O (3) (H3felden is the Schiff base resulting from the condensation of 2,4,6-triformylphloroglucinol with N,N- dimethylethylenediamine, mand- is the anion of the R-mandelic acid and dca- is the dicyanamide anion). Compounds 1 and 2 are discrete trinuclear species, while compound 3 is a 2D coordination polymer, constructed from trinuclear nodes and dicyanamido spacers. The variable-temperature magnetic properties of 1-3 have been investigated and they reveal the occurrence of weak antiferromagnetic interactions between the copper(ii) ions (-J values ranging from 0.90 to 2.40 cm-1) whose size and trend are dependent on the intramolecular copper-copper separation and nature of the basal chromophore at each copper atom. This journal is © 2013 The Royal Society of Chemistry.

Dragu E.A.,C D Nenitzescu Of The Romanian Academy | Hanganu A.,C D Nenitzescu Of The Romanian Academy | Rau I.,Polytechnic University of Bucharest | Kajzar F.,Polytechnic University of Bucharest | And 3 more authors.
Molecular Crystals and Liquid Crystals | Year: 2014

Fluorescent properties and the photoisomerization behaviour of 4-azulenylpyridine-substituted azobenzenes were investigated. All studied compounds have shown fluorescent emission in solution, originating from excited singlet state S2 → S0 of azulene moiety. The substitution of the azobenzene chromophore has affected the preservation of the fluorescence emission in thin films prepared in PMMA matrix. Correlation of absorption spectra with 1H-NMR spectroscopy revealed that for all compounds the E → Z isomerization takes place upon exposure to UV light. Copyright © 2014 Taylor & Francis Group, LLC.

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