# Tailoring Pt-Based Organometallic Porous Network on Ag(111): A Model System for “Host-Guest” Chemistry

## TL;DR

Scientists created a model system using platinum atoms in a metal-organic network to study host-guest chemistry and catalysis.

## Contribution

A new model system using Pt-based 2D metal–organic networks on Ag(111) for studying host-guest interactions and catalytic behavior.

## Key findings

- Pt atoms coordinated with TPyPPB molecules form a hexagonal 2D network on Ag(111).
- Quadruple coordination of Pt atoms with N and Cl atoms induces rotor-like molecule formation.
- The system provides insights into host-guest chemistry and catalytic mechanisms.

## Abstract

Metal–organic
frameworks (MOFs) have proven to be versatile
platforms for anchoring individual metal atoms, which can act as single-atom
catalysts. Due to their well-defined geometric and electronic structure,
high porosity, and adjustable pore size, MOFs can modulate the catalytic
performance of anchored individual atoms. In this work, we explored
the surface-assisted synthesis of 2D surface metal–organic
networks (SMONs) of 1,3,5-tris­[4-(pyridine)-[1,1’-biphenyl]­benzene]
(TPyPPB) coordinated with Pt atoms on Ag(111) by using scanning tunneling
microscopy at room temperature. The Pt deposition was performed in
two routes: (i) by using the dichloro-(1,10-phenanthroline)-platinum­(II)
(Cl2PhPt) or (ii) by direct deposition of Pt atoms. Using
Cl2PhPt as a Pt source and applying various annealing sequences
at a temperature of 400 K, a long-range hexagonal SMONs is obtained.
After the dechlorination of the Cl2PhPt molecule, individual
Pt atoms establish quadruple coordination with two N atoms at the
pyridyl end groups of the TPyPPB molecule and two Cl atoms. These
pores have efficiently induced the formation of large molecules that
behave like rotors. Such a system has the potential to open new frontiers
and shed light on a better understanding of the physical-chemistry
mechanisms involved in “host-guest” chemistry.