Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 49: Poster Nanostructures at Surfaces
O 49.7: Poster
Dienstag, 18. März 2025, 18:00–20:00, P2
Phase Transitions of Naphthalene-2,3-carbonitride Steered by Solvent Effects and Metal Ion Concentration Variation — •Longnan Yu1, Li Wang2, and Xiaoqing Liu3 — 1KIT, Karlsruhe, Germany — 2Nanchang University, Nanchang, China — 3Nanchang University, Nanchang, China
This study explores the structural phase transitions of naphthalene-2,3-carbonitride (2,3-DCN) on highly oriented pyrolytic graphite (HOPG) influenced by varying solvents and Cu2+ ion concentrations. By combining scanning tunneling microscopy and density functional theory, it is revealed that in 1-nonanoic acid,Cu2+ ions coordinate with 2,3-DCN and other ligands (Cl- or 1-nonanoic acid), forming structures with a coordination number of 4 that depend on the 2,3-DCN to Cu2+ molar ratio. In contrast, in 1-heptanoic acid,Cu2+ ions do not coordinate with 2,3-DCN, and phase transitions occur solely through altered hydrogen bonding. This work highlights solvent-dependent metal organic coordination as a novel strategy for tailoring nanoarchitectures.
Keywords: Conjugated molecules; Molecular self-assembly; Electrical properties; Scanning tunneling microscopy