TREATMENT TESTS FOR EX SITU REMOVAL OF CHROMATE &amp; NITRATE &amp; URANIUM (VI) FROM HANFORD (100-HR-3) GROUNDWATER FINAL REPORT

Ma, Beck; Jb, Duncan

doi:10.2172/940174

Cited by 1 publication

(2 citation statements)

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“…Therefore, if one can introduce these metal components into polymer chains as "staining reagents", the amorphous single polymer chain could be easily observed and confirmed by STM depending on the position of metal. Generally, metal components are introduced into polymers through three approaches, viz., (1) polymerization of monomers with metal ions in the main chains or pendant groups, [26][27][28][29][30] (2) supramolecular polymerization through coordination of metal ions with organic monomer in the main chains, [31][32][33][34][35][36][37][38][39][40][41] and (3) metalation of pendant groups through postpolymerization modification. [42][43][44][45][46][47][48][49][50][51][52][53] However, these approaches have certain limitations.…”

Section: Introductionmentioning

confidence: 99%

“…[54][55][56] In the second approach, the supramolecular polymerization is mainly achieved through dynamic coordination interaction. 32,36,37,[39][40][41]57 Therefore, precise control of the polymerization is difficult for dynamic supramolecular polymers with labile coordination bonds. In the third approach, metalation of pendant groups after polymerization is also limited to metal with weak coordination to get low-defect polymers.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Metallopolymers and Direct Visualization of the Single Polymer Chain

Zhao

et al. 2020

J. Am. Chem. Soc.

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During the past few decades, the study of the single polymer chain has attracted considerable attention with the goal of exploring the structure-property relationship of polymers. It still, however, remains challenging due to the variability and low atomic resolution of the amorphous single polymer chain. Here, we demonstrated a new strategy to visualize the single metallopolymer chain with a hexameric or trimeric supramolecule as a repeat unit, in which Ru(II) with strong coordination and Fe(II) with weak coordination were combined together in a stepwise manner. With the help of ultrahigh-vacuum, low-temperature scanning tunneling microscopy (UHV-LT-STM) and scanning tunneling spectroscopy (STS), we were able to directly visualize both Ru(II) and Fe(II), which act as staining reagents on the repeat units, thus providing detailed structural information for the single polymer chain. As such, the direct visualization of the single random polymer chain is realized to enhance the characterization of polymers at the singlemolecule level.

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