Highly Elliptic Circular Dichroism of Copper Aspartate One-Dimensional Nanostructures across the Ultraviolet to Terahertz Ranges

Choi, Won Jin; Kim, Ji-Young; Hwang, Myonghoo; Lim, Chung Man; Park, Bum Chul; Emre, Ahmet; Lee, Sang Hyun; Kotov, Nicholas A.

doi:10.1021/acs.nanolett.5c00411

Highly Elliptic Circular Dichroism of Copper Aspartate One-Dimensional Nanostructures across the Ultraviolet to Terahertz Ranges

Journal Article · Fri May 02 00:00:00 EDT 2025 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.5c00411· OSTI ID:2587404

^[1]; ^[2]; Hwang, Myonghoo ^[3]; Lim, Chung Man ^[4]; Park, Bum Chul ^[4]; ^[4]; Lee, Sang Hyun ^[4]; ^[4]

Univ. of Michigan, Ann Arbor, MI (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Univ. of Michigan, Ann Arbor, MI (United States); Rensselaer Polytechnic Inst., Troy, NY (United States)
Rensselaer Polytechnic Inst., Troy, NY (United States)
Univ. of Michigan, Ann Arbor, MI (United States)

Since the discovery of chirality, circular dichroism (CD) of mirror-asymmetric molecules has been studied across the ultraviolet, visible, and near-infrared ranges. Recently, chiroptical activity studies have expanded to the terahertz (THz) range, where resonance peaks originate from collective vibrations of tens and hundreds of atoms. Here, in this study, we synthesized Cu²⁺ coordination complexes with L- and D-aspartic acid as nanowires and nanorods and characterized their chiroptical activity across multiple frequency ranges. Both chiral nanostructures exhibit strong electronic CD (ECD), primarily from Cu²⁺ d-d transitions, while vibrational CD (VCD) spectra show sharp C=O, C–H, and O–H vibronic peaks, indicating higher atomic defect densities in nanorods than nanowires. Although THz CD (TCD) spectra are broad, they exhibit ∼1000× greater ellipticity than ECD and VCD, perhaps warranting previous references to circular dichroism of nanostructures as giant. Comparative TCD analysis highlights strong chiral phonon sensitivity, underscoring its potential for probing defect densities and structural changes for various chiral nanostructures and (bio)crystals.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF); National Research Foundation of Korea (NRF)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2587404

Report Number(s):: LLNL--JRNL-872303

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 19 Vol. 25; ISSN 1530-6992; ISSN 1530-6984

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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THz spectroscopy
chiral phonons
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Highly Elliptic Circular Dichroism of Copper Aspartate One-Dimensional Nanostructures across the Ultraviolet to Terahertz Ranges

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