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Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

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Planar tetracoordinate carbon in extended systems.

Pattath D Pancharatna¹, Miguel Angel Méndez-Rojas, Gabriel Merino

¹Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA.

Journal of the American Chemical Society

|November 19, 2004

Summary

Researchers explored extending a novel carbon system, C(5)(2-), into polymers. They found that coordination through terminal carbons is favored, leading to potential new materials like C(5)M(x).

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Area of Science:

Theoretical Chemistry
Materials Science
Solid-State Chemistry

Background:

A novel planar tetracoordinate carbon system, C(5)(2-), has been proposed.
This unique structure offers potential for extension into extended networks.

Purpose of the Study:

To investigate the potential for extending the C(5)(2-) unit into one, two, and three-dimensional systems.
To explore the polymerization of C(5)(2-) in the presence of countercations.

Main Methods:

Analysis of the electronic structure of C(5)(2-).
Computational examination and geometry optimization of dimers (e.g., C(10)Li(3-), C(10)Li(4)) and trimers (C(15)Li(6)).
Band structure calculations and energetic evaluations for potential polymeric systems.

Main Results:

Coordination through terminal carbons is identified as the preferred mode in oligomers and polymers.
Several plausible stoichiometries for C(5)M(x) systems (where M = Li, Be, Pt, Zn) were identified.
Electronic and structural reasonableness of these potential polymeric materials were assessed.

Conclusions:

The C(5)(2-) unit can be extended into polymeric structures.
The study provides a foundation for designing novel carbon-based materials with tunable electronic properties.