Exploring the effect of substitution patterns on the symmetry of hydrogen-bonded supramolecular motifs in functionalized benzosiloxaboroles
Literature Information
Krzysztof Durka, Adam Zuba, Krzysztof Nowicki, Jakub Drapała, Krzysztof Woźniak, Sergiusz Luliński
Crystal structures of a series of 26 functionalized 3-hydroxybenzo[c][1,2,3]siloxaboroles were compared taking into account electronic and steric effects of substituents at the aromatic ring on the hydrogen-bond (HB) motifs involving B–OH groups. The supramolecular assemblies of those compounds show strong variation depending on the number, position and type of substituents. Thus, HB dimers, trimers, tetramers and chains are formed. Most 7-substituted derivatives are isomorphous and crystallize in the I41/a tetragonal space group of symmetry featuring cyclic propeller-like tetramers as a characteristic structural motif. DFT calculations revealed that all observed HB motifs are characterized by similar stabilization energies ranging from −25 to −35 kJ mol−1 per molecule, which rationalizes the strong diversification of HB motifs in the studied structures.
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CrystEngComm

CrystEngComm is the forum for the design and understanding of crystalline materials. We welcome studies on the investigation of molecular behaviour within crystals, control of nucleation and crystal growth, engineering of crystal structures, and construction of crystalline materials with tuneable properties and functions. We publish hypothesis-driven research into… how crystal design affects thermodynamics, phase transitional behaviours, polymorphism, morphology control, solid state reactivity (crystal-crystal solution-crystal, and gas-crystal reactions), optoelectronics, ferroelectric materials, non-linear optics, molecular and bulk magnetism, conductivity and quantum computing, catalysis, absorption and desorption, and mechanical properties. Using Techniques and methods including… Single crystal and powder X-ray, electron, and neutron diffraction, solid-state spectroscopy, spectrometry, and microscopy, modelling and data mining, and empirical, semi-empirical and ab-initio theoretical evaluations. On crystalline and solid-state materials. We particularly welcome work on MOFs, coordination polymers, nanocrystals, host-guest and multi-component molecular materials. We also accept work on peptides and liquid crystals. All papers should involve the use or development of a design or optimisation strategy. Routine structural reports or crystal morphology descriptions, even when combined with an analysis of properties or potential applications, are generally considered to be outside the scope of the journal and are unlikely to be accepted.












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