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Instruments / Technical Area	Publication Details	Published	Actions
B23-Circular Dichroism	Mapping the chiroptical properties of local domains in thin films of chiral silicon phthalocyanines by CD imaging Dora-maria Rasadean , Tiberiu-marius Gianga , Tamas Javorfi , Rohanah Hussain , Giuliano Siligardi , G. Dan Pantos Molecules 25 DOI: 10.3390/molecules25246048 Diamond Proposal Number(s): [23955, 20441, 26447] Open Access Show Abstract ▼ Abstract: The first example of uniformly chiral thin films of silicon phthalocyanines (SiPcs) are reported. The local domains of the films are mapped using circular dichroism (CD) imaging (CDi) technique available at the Diamond B23 beamline. The CDi allowed us to increase the spatial resolution up to 525× when compared with benchtop spectrometers. The results indicate formation on-surface of chiral and stable supramolecular assemblies with homogenous distribution. Chemical functionalization and solvent choice for deposition allow controllable chiroptical properties to be obtained. The method and technique reported in this work could be applied to prepare and characterize a wide variety of chiral thin films.	Dec 2020
	Pyrroloindole-based dynamic combinatorial chemistry Tiberiu-marius Gianga , Dora-maria Răsădean , G. Dan Pantos Symmetry 12 DOI: 10.3390/sym12050726 Open Access Show Abstract ▼ Abstract: We report a new class of building blocks for Dynamic Combinatorial Chemistry (DCC) based on the pyrroloindole scaffold. The attachment of l-cysteine on the α, α′ positions of the core makes the molecule suitable for disulfide exchange in aqueous dynamic combinatorial libraries (DCLs). The synthesis of the core follows a modified version of the Knoevenagel–Hemetsberger approach. The new building block (l-PI) is fluorescent (Φ = 48%) and relatively stable towards thermal and photodegradation. The chirality of the cysteine is transferred to the electron-rich pyrroloindole core. Homo- and heterochiral DCLs of l-PI with electron-deficient l- and d-naphthalenediimide (NDI) lead to similar library distributions regardless of the enantiomer used. When no salt is present, the major component is a dimer, while dimers and tetramers are obtained at increased ionic strength.	May 2020

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