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Ligand-Unsupported Assembly of a Linear Penta-Tin Chain via Metal-Metal Donor-Acceptor Interactions
Yi-Chen Lin1, Kuheli Das1, Ankit Raj1
1Department of Applied Chemistry, National Yang Ming Chiao Tung University, 1001 Daxue Rd, East District, Hsinchu City 300093, Taiwan.
Abstract:
Herein, we report a metal-metal interaction-driven strategy for constructing extended tin chains without relying on preorganized ligand frameworks. By combining a nucleophilic Sn(I) distannyne supported by a sterically undemanding dipyridylpyrrolate ligand with a neutral yet highly Lewis-acidic Sn(II) synthon, stepwise chain growth from di- to tri- and ultimately to a linear penta-tin complex was achieved. Multinuclear NMR, UV-vis, Raman, and X-ray absorption spectroscopies, together with elemental analysis, establish the structures and mixed-valence nature of the tri- and penta-tin complexes. Complementary density functional theory (DFT) calculations support these assignments by identifying the centrally located Sn(II) motif as the thermodynamically preferred arrangement and rationalizing the observed spectroscopic trends.
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