Publications

Global aromaticity at the nanoscale

Does aromaticity have a size limit? Evidence is presented for global aromaticity in porphyrin nanorings with circuits of up to 162 …

Mechanisms of IR amplification in radical cation polarons

Break down of the Born–Oppenheimer approximation is caused by mixing of electronic and vibrational transitions in the radical cations …

Time-Resolved Structural Dynamics of Extended π-Electron Porphyrin Nanoring

The design of molecular structures inspired by naturally occuring light harvesting systems has been intensely pursued over the last …

Probing the orientation of porphyrin oligomers in a liquid crystal solvent – a triplet state electron paramagnetic resonance study

Linear porphyrin oligomers have found various applications as synthetic molecular wires in the context of light harvesting, solar …

Aromaticity and Antiaromaticity in the Excited States of Porphyrin Nanorings

Aromaticity can be a useful concept for predicting the behavior of excited states. Here we show that π-conjugated porphyrin nanorings …

Watching Bonds Move in a Large Antiaromatic Ring

In antiaromatic molecules, single and double bonds interconvert via a process called bond-shift valence tautomerization, which is often …

Janus Graphene: Scalable Self-Assembly and Solution-Phase Orthogonal Functionalization

Orthogonal functionalization of 2D materials by selective assembly at interfaces provides opportunities to create new materials with …

Global Aromaticity and Antiaromaticity in Porphyrin Nanoring Anions

Doping, through oxidation or reduction, is often used to modify the properties of π-conjugated oligomers. In most cases, the resulting …

Band Structures of Periodic Porphyrin Nanostructures

Recent progress in the synthesis of π-conjugated porphyrin arrays of different shapes and dimensionalities motivates us to examine the …

A Semiconducting Conjugated Radical Polymer: Ambipolar Redox Activity and Faraday Effect

Investigations of magnetism in electronically coupled polyradicals have largely focused on applications in photonic and magnetic …

Insights into Magneto-Optics of Helical Conjugated Polymers

Materials with magneto-optic (MO) properties have enabled critical fiber-optic applications and highly sensitive magnetic field …

Template-Directed Synthesis of a Conjugated Zinc Porphyrin Nanoball

We report the template-directed synthesis of a π-conjugated 14-porphyrin nanoball. This structure consists of two intersecting …

Detection of a weak ring current in a nonaromatic porphyrin nanoring using magnetic circular dichroism

We compare the absorption and magnetic circular dichroism (MCD) spectra of a series of porphyrin oligomers – dimer, tetramer, and …

Electronic Delocalization in the Radical Cations of Porphyrin Oligomer Molecular Wires

The radical cations of a family of π-conjugated porphyrin arrays have been investigated: linear chains of N = 1–6 porphyrins, a …

Quantifying the exchange coupling in linear copper porphyrin oligomers

Linear π-conjugated porphyrin oligomers are of significant current interest due to their potential applications as molecular wires. In …

Constructive quantum interference in a bis-copper six-porphyrin nanoring

Quantum interference in charge transport is attracting interest with applications in nanoelectronics and quantum computing. Here, the …

Aromatic and antiaromatic ring currents in a molecular nanoring

Aromatic and antiaromatic molecules—which have delocalized circuits of [4n + 2] or [4n] electrons, respectively—exhibit ring currents …

Photogenerated triplet states in supramolecular porphyrin ladder assemblies: an EPR study

Introducing bridging ligands such as DABCO to solutions of linear zinc porphyrin oligomers has previously been shown to lead to the …

Harnessing NMR relaxation interference effects to characterise supramolecular assemblies

Solution-state NMR spectroscopy remains the primary method for characterising synthetic supramolecular assemblies. Yet, in their NMR …

Experimental and computational evaluation of the barrier to torsional rotation in a butadiyne-linked porphyrin dimer

The barrier to torsional rotation in a butadiyne-linked porphyrin dimer has been determined in solution using variable temperature …

Synthesis of Five-Porphyrin Nanorings by Using Ferrocene and Corannulene Templates

The smallest and most strained member of a family of π-conjugated cyclic porphyrin oligomers was synthesized by using pentapyridyl …

Excitation wavelength-dependent EPR study on the influence of the conformation of multiporphyrin arrays on triplet state delocalization

Excitation wavelength-dependent EPR and ENDOR reveal localization of the triplet state in twisted conformations of porphyrin oligomers.

Transient EPR Reveals Triplet State Delocalization in a Series of Cyclic and Linear π-Conjugated Porphyrin Oligomers

The photoexcited triplet states of a series of linear and cyclic butadiyne-linked porphyrin oligomers were investigated by transient …

Photophysics of Threaded sp-Carbon Chains: The Polyyne is a Sink for Singlet and Triplet Excitation

We have used single-crystal X-ray diffraction and time-resolved UV–NIR–IR absorption spectroscopy to gain insights into the structures …