Isoreticular two-dimensional covalent organic frameworks synthesized by on-surface condensation of diboronic acids

Jürgen F. Dienstmaier, Dana D. Medina, Mirjam Dogru, Paul Knochel, Thomas Bein, Wolfgang M. Heckl, Markus Lackinger

Research output: Contribution to journalArticlepeer-review

192 Scopus citations

Abstract

On-surface self-condensation of 1,4-benzenediboronic acid was previously shown to yield extended surface-supported, long-range-ordered two-dimensional covalent organic frameworks (2D COFs). The most important prerequisite for obtaining high structural quality is that the polycondensation (dehydration) reaction is carried out under slightly reversible reaction conditions, i.e., in the presence of water. Only then can the subtle balance between kinetic and thermodynamic control of the polycondensation be favorably influenced, and defects that are unavoidable during growth can be corrected. In the present study we extend the previously developed straightforward preparation protocol to a variety of para-diboronic acid building blocks with the aim to tune lattice parameters and pore sizes of 2D COFs. Scanning tunneling microscopy is employed for structural characterization of the covalent networks and of noncovalently self-assembled structures that form on the surface prior to the thermally activated polycondensation reaction.

Original languageEnglish
Pages (from-to)7234-7242
Number of pages9
JournalACS Nano
Volume6
Issue number8
DOIs
StatePublished - 28 Aug 2012
Externally publishedYes

Keywords

  • boronic acid
  • condensation
  • covalent organic frameworks
  • dehydration
  • scanning tunneling microscopy
  • surface chemistry

Fingerprint

Dive into the research topics of 'Isoreticular two-dimensional covalent organic frameworks synthesized by on-surface condensation of diboronic acids'. Together they form a unique fingerprint.

Cite this