From 1D
Helix to 0D Loop: Nitrite Anion Induced Structural
Transformation Associated with Unexpected <i>N</i>‑Nitrosation
of Amine Ligand
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Abstract
An infinite Ag(I) coordination 4<sub>1</sub>-helical chain, [Ag(Hdpma)](NO<sub>3</sub>)<sub>2</sub>·H<sub>2</sub>O (<b>1</b>), was synthesized
by the self-assembly of AgNO<sub>3</sub> and di(3-pyridylmethyl)amine
(dpma). Helix <b>1</b> is 5-fold interweaved and has a topological
diamondoid-like net that is extended by ligand-unsupported helix-to-helix
argentophilic interactions. Two identical diamondoid-like nets with
opposite chiralities interpenetrate to form the whole 3D framework
as a meso compound. Typical anion-exchange reactions cause a remarkable
single-crystal-to-single-crystal (SCSC) structural transformation
from the 1D helix <b>1</b> to the 0D molecular loop [Ag(dpma-NO)(NO<sub>2</sub>)]<sub>2</sub> (<b>2</b>) (induced by the nitrite anion,
NO<sub>2</sub><sup>–</sup>) and a 1D molecular ladder [Ag(dpma)(H<sub>2</sub>O)](NO<sub>3</sub>) (induced by the fluoride anion,
F<sup>–</sup>). Molecular loop <b>2</b> is an <i>N</i>-nitroso compound. This work is the first to present observations
of nitrite-dominated in situ <i>N</i>-nitrosation of an
amine ligand which accompanies SCSC structural transformation via
an anion-exchange reaction
