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Title: I/I3 Redox-Assisted Synthesis and Properties of Low Dimensional, Mixed-Valent Gold Iodide Perovskite Derivatives

Journal Article · · Crystal Growth and Design

Here, we report a set of three new mixed-valent AuI AuIII iodides: (ClPy)3[AuI2]2[AuI4] [1], (BrPy)3[AuI2]2[AuI4] [2], and (ClPy)2[AuI2][AuI4] [3], as well as three new monovalent AuIII iodides: (XPy)2[AuI4][I3] (Py = 4-X-pyridinium X = Cl, Br, and I) [4–6]. Two of these mixed-valent compounds (1 and 2) incorporate both monovalent AuI···AuI (aurophilic bonding) and mixed-valent AuII···AuIIII couples (Au–I halogen bonding), to the best of our knowledge an unprecedented structural feature. These same two mixed-valent compounds also exhibit a rare low-dimensional molecular architecture with respect to second sphere Au···I interactions, namely, 1D chains of Au···I interactions, extending along a single crystallographic axis. All compounds were synthesized with the assistance of the I/I3 redox couple and tacit manipulation of the polyiodide content during synthesis. Air-free synthesis was used to influence the redox process of I/I3, resulting in better selection for mixed-valent products. Compounds 1–2 and 4–5 exhibit a characteristically narrow bandgap (1.04–1.25 eV), as measured via diffuse reflectance spectroscopy (DRS). Computational analyses were used to rationalize the specific assembly modes of [AuI2] and [AuI4] species, and they show that the AuI···I interaction type is favored over the AuIII···I.

Research Organization:
George Washington Univ., Washington, DC (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003996
OSTI ID:
2282256
Journal Information:
Crystal Growth and Design, Vol. 24, Issue 2; ISSN 1528-7483
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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