The self-assembly of two emeraldine base tetra(aniline) derivatives is investigated using scanning tunneling microscopy. A combination of the scanning tunneling microscopy data and calculations reveals the presence of predicted cis/trans isomerism in this oxidation state. This isomerism is shown to hinder self-assembly into ordered structures, and provides indications as to why the properties o...

The ester functionality does not introduce a center of asymmetry and thus optical and geometric isomerism does not result from the presence of this functional group. The ester functionality (the carbonyl and ether oxygen) is composed of an sp hybridized carbon so it cannot be chiral, and since there is free rotation about the ether bond geometric isomerism also is not possible at the sp center....

There are reports that in right atrial isomerism the conduction system has paired sinus nodes and paired atrioventricular nodes. Electrophysiological studies were performed in two patients with right atrial isomerism. One patient had a delta wave on the surface electrocardiogram without tachycardia attacks. The other, who did not have manifest pre-excitation, had recurrent narrow QRS tachycardi...

Reversible encapsulation complexes create spaces where two or more molecules can be temporarily isolated. When the mobility of encapsulated molecules is restricted, different arrangements in space are possible, and new forms of isomerism ("social isomerism") are created: the orientation of one encapsulated molecule influences that of the other in the confined space. Expansion of a capsule's len...

The synthesis of a series of asymmetric mixed 2,6-disubstituted (arylcarboxamido)(arylimino)pyridine ligands and their coordination chemistry toward a series of divalent first-row transition metals (Cu, Co, and Zn) have been explored. Complexes featuring both anionic N,N',N″-carboxamido and neutral O,N,N'-carboxamide coordination have been prepared and characterized by X-ray crystallography, cy...

Objective: Totally anomalous pulmonary venous connection directly to the superior caval vein is unusual. It is frequently associated with major congenital heart defects such as the syndrome of right isomerism. While improved results have been reported recently for the isolated form, complex cases are still associated with a higher mortality. Methods: We undertook surgical correction in nine pat...

Congenital cardiac malformations which include isomerism of the atrial appendages are amongst the most challenging of problems for diagnosis and also for medical and surgical management. The nomenclature for pathological description is controversial, but difficulties can be overcome by the use of a segmental approach. Such an approach sets out the morphology and the topology of the chambers of ...

1387-7003/$ see front matter 2009 Elsevier B.V. A doi:10.1016/j.inoche.2009.08.021 * Corresponding author. Tel.: +49 89 2180 77404; f E-mail address: [email protected] (P. Kl The two novel binuclear pyrazole-3,5-dicarboxylato-bridged {RuNO} complexes K2[{Ru(NO)Cl}2(l-pzdc)2] (1) and [{Ru(NO)(H2O)}2(l-pzdc)2] 4H2O (2) (pzdc = pyrazole-3,5-dicarboxylate) were synthesized and characterized...