Transition metal complexes containing allenylidene, cumulenylidene, and related ligands

Article Abstract:

Transition metal compounds with ligands of vinylidene, allenylidene and cumulenylidene complexes were reviewed. The general synthesis for metal complexes of allenylidenes required the addition of a pre-formed C3 skeleton having a leaving cluster or molecule while the most applied approach to the cumulenylidene synthesis was the introduction of additional unsaturation into the the alkyne derivatives. The bonding of allenylidene ligands to metal clusters showed the attachment potential to more than two metal centers and the interaction of three carbons of the unsaturated C3 fragment.

Transition metal compounds, Complex compounds

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Helicates as versatile supramolecular complexes

Article Abstract:

The development of heterotopic, heteronuclear and other helicates will lead to new supramolecular functional systems. Self-process generated helicates have evolved to include new supramolecular concepts wherein coordination bonds may be employed for producing larger organized architectures. Helicate self-assembly, however, involves complex and time-consuming preparations of instructed ligand strands.

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"Let's twist again"--double-stranded, triple-stranded, and circular helicates

Article Abstract:

This review discusses coordination compounds consisting of metal complexes containing one or more ligand strands and two or more metal centers termed helicates, which are double- and triple-stranded. Circular helicates, helicates usage as templates in the synthesis of molecular knots, and ligand self-recognition during the self-assembly of helicates are discused.

Germany, Analysis, Binding sites (Biochemistry), Active sites (Biochemistry), Metal complexes (Chemistry)

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