Terbium(III) was coordinated to four novel 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) amphiphilic bisamide ligands. The complexes were assembled into mono-disperse micellar nano-aggregates and for the first time Tb(III) has been evaluated as a single lanthanide negative bimodal contrast agent for MRI/OI. The complexes show characteristic Tb(III) emission with quantum yields...

Angular dioxygenation has been established as the crucial step in dibenzofuran degradation by Brevibacterium sp. strain DPO 1361 (V. Strubel, K. H. Engesser, P. Fischer, and H.-J. Knackmuss, J. Bacteriol. 173:1932-1937, 1991). The same strain utilizes biphenyl and fluorene as sole sources of carbon and energy. The fluorene degradation sequence is proposed to be initiated by oxidation of the flu...

The rhodium- or copper-catalyzed intramolecular aromatic carbenoid insertion of biaryldiazoacetates offers a convenient route to fluorene carboxylates with high yields. Whereas, thermal conditions provided a mixture of two regioisomeric products when substituted biaryldiazoacetates were employed as substrates. The developed catalytic conditions displayed an excellent level of regioselectivity, ...

Most of the triarylamine-based electrochromic polymers are achieved through arylamine-based oxidative coupling reactions where properties polymer could only be realized after fabrication film on optically transparent electrodes. Electrochemical polymerization, other hand, is an in situ polymerization method which offers synthesis and films electrode surface simultaneously. In this study two new...

Transient precursor states are often experimentally observed for molecules adsorbing on surfaces. However, such precursor states are typically rather short-lived, quickly yielding to more stable adsorption configurations. Here we employ first-principles calculations to systematically explore the interaction mechanism for benzene derivatives on metal surfaces, enabling us to selectively tune the...

The title compound, C(16)H(8)N(2)·C(6)H(4)S(4), crystallizes with the fluorene derivative placed in a general position and two half tetra-thia-fulvalene (TTF) mol-ecules, each completed to a whole mol-ecule through an inversion center. The fluorene ring system is virtually planar (r.m.s. deviation from the mean plane = 0.027 Å) and the dicyano group is twisted from the fluorene plane by only 3....

As part of a strategy to achieve large two-photon absorptivity in fluorene-based probes, a series of donor-acceptor-donor (D-A-D) type derivatives were synthesized and their two-photon absorption (2PA) properties investigated. The synthesis of D-A-D fluorophores was achieved by efficient preparation of key intermediates for the introduction of central electron acceptor groups. To accomplish the...

Previous studies in vitro of the metabolism of the carcinogen 2-acetylaminofluorene (AAF) by rat liver slices indicated that the compound is subject to deacetylation, hydroxylation, and protein binding (1, 2). Protein binding of carcinogens of diverse chemical structure by the susceptible tissue appears t.o be a generalized phenomenon and, in several instances, there is a good correlation betwe...