4-vinylpyridine derivatives: Protonation, methylation and silver(I) coordination chemistry

Zhang, Guoqi

doi:10.1177/1747519821989659

Cited by 1 publication

(1 citation statement)

References 28 publications

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“…While the resulting N-Ag interaction may not be considered a proper coordination bond (typical bond lengths of 2.1–2.6 Å), it still corresponds to a weak attractive N···Ag interaction (N···Ag distances in the 2.8–3.3 Å range; the sum of the van der Waals radii amounts to 3.25 Å). Similar N···Ag interactions are encountered among and stabilize crystals of coordination polymers. − …”

Section: Resultsmentioning

confidence: 89%

The Flexible On-Surface Self-Assembly of a Low-Symmetry Mabiq Ligand: An Unconventional Metal-Assisted Phase Transformation on Ag(111)

et al. 2021

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The self-assembly of metal−organic complexes and networks of increasing complexity on solid surfaces is important for their application in a variety of fields, such as catalysis, sensing, and molecular magnetism. Here, we have selected a low-symmetry, freebase macrocyclic biquinazoline ligand, H-Mabiq, which upon metalation has the potential to incorporate cations in two different coordination sites, affording multi-valency and multielectron transfer capacity. We show that H-Mabiq molecules readily self-assemble onto the Ag(111) surface at room temperature, forming a well-ordered monolayer of closely packed molecules. Upon increasing the temperature, a new phase with a different long-range order and molecular packing is obtained. By means of scanning tunneling microscopy and photoelectron spectroscopy, we show that this new phase is characterized by a distinctive silver-bridged dimeric motif, entailing a Ag adatom accommodated at the peripheral coordination site of two opposing H-Mabiq molecules. Thus, the present work reveals the ability of the bio-inspired Mabiq ligands to form surface-confined two-dimensional assemblies incorporating metal adatoms. The results bode promise for the use of metalcontaining Mabiq compounds to engineer regular bimetallic arrays with atomic precision.

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