1st International Conference on Noncovalent Interactions
Welcome to this themed collection of RSC articles entitled: 1st International Conference on Noncovalent Interactions.
Organic crystal engineering beyond the Pauling hydrogen bond
The application of weaker intermolecular attractions to the formation of crystals with desired physical and chemical properties is described. Representative structural examples are analysed critically and approaches are outlined for the future development of this important area.
Quantification of noncovalent interactions – promises and problems
Quantification of noncovalent interactions is the key for the understanding of binding mechanisms, of biological systems, for the design of drugs, their delivery and for the design of receptors for separations, sensors, actuators, or smart materials.
Hydrogen bonds, and σ-hole and π-hole bonds – mechanisms protecting doublet and octet electron structures
For various interactions electron charge shifts try to protect the former doublet or octet electronic structure of the Lewis acid centre.
Chalcogen bonding in synthesis, catalysis and design of materials
This Perspective highlights the use of chalcogen bonding as a versatile synthon for the synthesis, catalysis and construction of both organic and inorganic materials.
Harnessing non-covalent interactions to exert control over regioselectivity and site-selectivity in catalytic reactions
This perspective examines the progress that has been made in using non-covalent interactions to control regioselectivity and site-selectivity in catalysis.
Hydrogen bonds with fluorine. Studies in solution, in gas phase and by computations, conflicting conclusions from crystallographic analyses
Hydrogen bonds with organic fluorine and other halogens as acceptors show a consistent picture in gas and solution phase in agreement with computations, whereas conflicting conclusions were drawn from crystallographic analyses.
Non-covalent interactions in
Biomolecular building blocks (H-bonded and stacked base pairs) determine the structure of biomolecules (DNA).
Co-crystal synthesis: fact, fancy, and great expectations
Some strategies for driving co-crystal synthesis using a variety of competing non-covalent interactions are presented.
Far infrared spectroscopy of hydrogen bonding collective motions in complex molecular systems
Far infrared spectroscopy as a tool for the study of inter and intramolecular interactions in complex molecular structures.
Halogen bonding anion recognition
The development of solution-based anion receptor molecules which exploit halogen bonding interactions is an emerging area of research. This Feature Article reviews recent advances which have been made in this rapidly developing field, surveying the use of iodoperfluoroarene, haloimidazolium and halotriazole/triazolium halogen-bond-donor motifs in anion receptor design and describing the application of mechanically interlocked rotaxane and catenane frameworks as halogen bonding anion host systems.
Polyaromatic N-heterocyclic carbene ligands and π-stacking. Catalytic consequences
This article highlights how π-stacking interactions have an important influence on the catalytic properties of transition metal complexes decorated with rigid polyaromatic ligands.
Hydrogen bonding networks of nalidixic acid–copper(II) complexes
The formation of hydrogen bonding networks of nalidixic acid–Cu(II) complexes is discussed and may be a possible pathway leading to improved properties and increased efficiency of this antibiotic.
Noncovalent interactions in the design of bis-azo dyes
A perfluorinated aromatic link was used as a synthon in the design of bis-azo dyes.
[2+2] Halogen-bonded boxes employing azobenzenes
Herein, we report the synthesis and crystal structures of three [2+2] supramolecular boxes assembled by halogen bonding.
“C–H⋯π Interaction” regulates the stereoselectivity in olefin polymerization
DFT calculations reveal that a coordinating THF plays an essential role in regulating the stereoselectivity via C–H⋯π noncovalent interaction.
Chirality-dependent halogen bonds in axially chiral quinazolin-4-one derivatives bearing ortho-halophenyl groups
In the crystals of racemic axially chiral quinazolinones, the formation of intermolecular halogen bonds was detected.
Halogen bonding of the aldehyde oxygen atom in cocrystals of aromatic aldehydes and 1,4-diiodotetrafluorobenzene
Novel halogen bonded cocrystals of aromatic aldehydes have been synthesized. We present the halogen bond acceptor potential of the aldehyde group oxygen atom in competition with the hydroxy, methoxy and pyridine groups.
Light-driven control of the composition of a supramolecular network
All-photonic and reversible switching of the composition of a supramolecular network is enabled by employing a dithienylethene guest.
The diiodomethyl-sulfonyl moiety: an unexplored halogen bond-donor motif
The α-iodosulfone moiety acts as a new and effective halogen bond donor system in the solid state and in solution.
Hexagonal array formation by intermolecular halogen bonding using a binary blend of linear building blocks: STM study
A bicomponent blend of linear building blocks leads to intermolecular halogen bonding, resulting in the formation of hexagonal arrays.
Halogen bonding in UiO-66 frameworks promotes superior chemical warfare agent simulant degradation
Herein, a series of halogenated UiO-66 derivatives was synthesized and analyzed for the breakdown of the CWA simulant dimethyl-4-nitrophenyl phosphate (DMNP) to analyze ligand effects.
Controlled α-mono- and α,α-di-halogenation of alkyl sulfones using reagent–solvent halogen bonding
The direct and selective α-halogenation of alkyl sulfones was achieved via base-mediated electrophilic halogenation, where reagent–solvent halogen bonding was found to control the selectivity through alteration of the effective size of the halogen source.
Halogen bonding effects on the outcome of reactions at metal centres
Key findings regarding the effects of ligand preorganisation via halogen bonding on the outcome of reactions at rhodium are reported.
Aryl-platform-based tetrapodal 2-iodo-imidazolium as an excellent halogen bond receptor in aqueous medium
The graphic shows a halogen bonding interaction between a tetrapodal platform attached to a 2-iodo-imidazole unit and bromide in water.
Ratiometric DNA sensing with a host–guest FRET pair
A host–guest FRET pair based on a carboxyfluorescein-labelled cucurbituril and DAPI was developed to sense DNA ratiometrically.
The nature of interactions of benzene with CF3I and CF3CH2I
Weak though structure determining interactions exist between benzene and F3CI or F3CCH2I; their natures are quite different and lead to different types of networks.
Correlating thermochromic and mechanochromic phosphorescence with polymorphs of a complex gold(I) double salt with infinite aurophilicity
Something learnt from a golden trio: polymorphs of a [Au(NHC)2][Au(CN)2] double salt allow an understanding of the thermochromic and mechanochromic phosphorescence of the gold(I) complexes with extended aurophilicity.
Assisted π-stacking: a strong synergy between weak interactions
An exceptionally strong synergy between aromatic π-stacking and n → π* interaction.
A rare example of a phosphine as a halogen bond acceptor
The cocrystal of triphenylphosphine with 1,3,5-trifluoro-2,4,6-triiodobenzene features a rare, moderately strong, and linear phosphorus–iodine halogen bond.
Hydrogen bonding versus π-interactions: their key competition in sildenafil solvates
Herein we report the X-ray characterization of four sildenafil solvates where the conformation of the pyrazolo[3,4-d]pyrimidine and phenyl rings depends on the solvent.
Continuum of covalent to intermolecular bonding in the halogen-bonded complexes of 1,4-diazabicyclo[2.2.2]octane with bromine-containing electrophiles
The Br⋯N bonds in a series of halogen-bonded complexes change gradually from the typical intermolecular to the traditional covalent bond.
Characterization of the short OC⋯OC π-hole tetrel bond in the solid state
An in-depth structure database investigation and experimental charge density analysis of the OC⋯OC π-hole tetrel bonds.
Palladium(II) N-heterocyclic allenylidene complexes with extended intercationic Pd⋯Pd interactions and MMLCT phosphorescence
Pallas's shine: extended intercationic Pd⋯Pd contacts of 3.30 Å show distinct MMLCT transitions and low-energy emissions.
Model molecules to classify CH⋯O hydrogen-bonds
A set of molecules locked in the CH⋯O H-bonding conformation has been used to correlate the magnitude of the downfield shift of the 1H NMR signal due to the bridging hydrogen with the hybridization state of the acceptor oxygen and the CH⋯O H-bond strength.
Diamondoid architectures from halogen-bonded halides
Halide ions and tetraiodoethynyl-featured tetraphenylmethane are successfully assembled into robust diamond-like networks in the presence of tetraphenylphosphonium cations.
Structure guided or structure guiding? Mixed carbon/hydrogen bonding in a bis-Schiff base of N-allyl isatin
A supramolecular motif listed as ‘carbon bonded’ or ‘hydrogen bonded’ may have the character of both. We highlight the hybrid character of the non-covalent interaction in a bis-Schiff base of N-allyl isatin by combining theory and experiment.
Non-covalent graphene nanobuds from mono- and tripodal binding motifs
Dispersion forces govern the interaction of graphene with mono- and tripodal pyrene–fullerene derivatives and direct the formation of graphene nanobuds.
A rational molecular design of triazine-containing alkynylplatinum(II) terpyridine complexes and the formation of helical ribbons via Pt⋯Pt, π–π stacking and hydrophobic–hydrophobic interactions
The self-assembly of strategically designed triazine-containing alkynylplatinum(II) terpyridine complexes yielded sophisticated helical ribbons through a balance of multiple non-covalent interactions.
Photoinduced reversible spin-state switching of an FeIII complex assisted by a halogen-bonded supramolecular network
The organization of a molecular FeIII complex embedded in a halogen-bonded 2D network is chemically tuned to trigger temperature- and light-induced spin-state switching.
A kinetic study of mechanochemical halogen bond formation by in situ31P solid-state NMR spectroscopy
In situ 31P solid-state NMR studies of mechanochemical halogen bond formation provide insights into the cocrystallisation process and an estimate of the activation energy.
Tridentate C–I⋯O−–N+ halogen bonds
N-Oxides can act as tridentate halogen bond acceptors, or as tetradentate ligands in a pseudo-μ4 mode with silver(I).
Fluorination promotes chalcogen bonding in crystalline solids
Flurorine promotes the electrophilicity of sulfur to the point that chalcogen bond formation affects the crystal packing in the solid.
Coordinated nitrate anions can be directional π-hole donors in the solid state: a CSD study
Within the CSD sp2 O-atoms cluster closer to the π-hole of NO3− when nitrate is coordinated to a metal.
A hand-twisted helical crystal based solely on hydrogen bonding
Third-generation crystal engineering: using halogen bond/hydrogen bond equivalence.
Spin-state modulation of molecular FeIII complexes via inclusion in halogen-bonded supramolecular networks
The cationic complex [Fe(qsal)2]+ (Hqsal = N-(8-quinolyl)salicylaldimine) is encapsulated in halogen-bonded 1D and 2D supramolecular networks to modulate its spin-state.
Ethynyl hydrogen bonds and iodoethynyl halogen bonds: a case of synthon mimicry
The common electrostatic features of ethynyl and iodoethynyl hydrogen- and halogen-bond donors, respectively, lead to synthon mimicry which can be employed in synthetic crystal engineering for the construction of identical supramolecular assemblies in the solid-state.
Halogen bonding between metal centers and halocarbons
Metal-involving halogen bonding was detected in a series of associates of CHI3 with trans-[PtX2(NCNAlk2)2] (X = Cl, Br).
Topology analysis reveals supramolecular organisation of 96 large complex ions into one geometrical object
Demonstrating the power of network topology analysis on a 46 000 Å3 unit cell containing 12 independent Ag(I) coordination entities.
H-bond competition experiments in solution and the solid state
When two different H-bond acceptors compete for a single H-bond donor, the outcomes in crystal structures of simple molecules are consistent with the results of solution phase measurements in non-polar solvents.
The non-planarity of the benzene molecule in the X-ray structure of the chelated bismuth(III) heteroboroxine complex is not supported by quantum mechanical calculations
The competition of two σ-hole(Bi)⋯π interactions is responsible for disorder of the benzene moiety in the crystal of bismuth(III) heteroboroxine–benzene complex.
Unexpected synthesis of an Au2In2 tetrametallatricyclic complex from α-aminophosphines and formation of Au–In–P and Ag–In–P nanomaterials
Four Au–(μ-phosphinite)–In units form an unprecedented Au2In2 12-membered metallacycle which intersects at the In centres an 8-membered ring containing two In–μ-phosphinate linkages, resulting in a tricyclic structure.
Porous organic hydrate crystals: structure and dynamic behaviour of water clusters
Infinite water clusters with a T5(2) motif were observed in porous crystals of 4-nitrostyrylpyridine hydrochloride, the behavior of which was revealed by solid-state 17O NMR spectroscopic analyses.
The N-atom in [N(PR3)2]+ cations (R = Ph, Me) can act as electron donor for (pseudo) anti-electrostatic interactions
A CSD analysis and DFT study reveal that the nitrogen lone-pair in [N(PPh3)2]+ is partially intact and involved in intramolecular hydrogen bonding.
Anion–π interactions and positive electrostatic potentials of N-heterocycles arise from the positions of the nuclei, not changes in the π-electron distribution
The positive ESPs that underlie anion-binding by N-heterocycles do not stem from a depletion of π-electron density, as widely assumed.
Photoresponsive liquid crystals based on halogen bonding of azopyridines
A series of photoresponsive halogen-bonded liquid crystals (LCs) were successfully constructed using molecular halogen and azopyridine compounds, which show interesting properties of photoinduced phase transition upon UV irradiation.
Weak becomes strong: remarkable strength of C–H⋯π hydrogen bond in the presence of O–H⋯O hydrogen bonds in the crystal stabilization
We report crystallographic evidence for the significance of C–H⋯π hydrogen bonds in the crystal stabilization of 1,4-di-O-benzoyl-myo-inositol. The strength of this otherwise weak hydrogen bond matches with the strength of O–H⋯O hydrogen bonds.
Interactions between dehydrobenzoannulene (DBA) and gas molecules: do the preorganized
acetylenes work cooperatively?
Intermolecular interactions of the cyclic conjugated molecule (DBA) with hydrogen, nitrogen and carbon dioxide molecules were evaluated by high level ab initio calculations.
Halogen bond effect on bundling of hydrogen bonded 2-fold helical columns
Bundling of the hydrogen bonded 2-fold helical columns has been altered on the basis of a robust halogen bond between an iodine and anionic oxygen atom. This alteration causes a change of the space groups of the resulting crystals.
Hydrogen bond assisted
activation of a dinitrile towards nucleophilic attack
The possibility of regioselective activation of a dinitrile towards nucleophilic attack using a resonance-assisted hydrogen bond system is demonstrated.
halogen and hydrogen bonding in [RuI2(H2dcbpy)(CO)2]⋯I2⋯(CH3OH)⋯I2⋯[RuI2(H2dcbpy)(CO)2]
A new type of concerted halogen bond–hydrogen bond interaction was found in the solid state structure of [RuI2(H2dcbpy)(CO)2]⋯I2⋯(MeOH)⋯I2⋯[RuI2(H2dcbpy)(CO)2].
Halogenated building blocks for 2D crystal engineering on solid surfaces: lessons from hydrogen bonding
We test whether the similarities between halogen and hydrogen bonds could be used to design a surface-confined halogen-bond based network.
Site-selective nitrenoid insertions utilizing postfunctionalized bifunctional rhodium(II) catalysts
Site-selective nitrenoid insertions are made possible with a postfunctionalized dirhodium(II)-catalyst equipped with a remote hydrogen bonding site.
Supramolecular cage encapsulation as a versatile tool for the experimental quantification of aromatic stacking interactions
A Double Mutant Cycle is built up using a supramolecular cage that binds two aromatic carboxylates in a stacked geometry is used to quantify aromatic stacking interactions.
Nanobowls with controlled openings and interior holes driven by the synergy of hydrogen bonding and π–π interaction
Nanobowls with controlled openings and interior holes are created by self-assembly of homopolymers with hydrogen bonding and π–π interaction.
Enantioselective fluorination of homoallylic alcohols enabled by the tuning of non-covalent interactions
Multivariate correlation analysis, including designer π-interaction derived parameters, was applied to the study of the enantioselective fluorination of homoallylic alcohols via chiral anion phase transfer (CAPT) catalysis.
Self-complementary nickel halides enable multifaceted comparisons of intermolecular halogen bonds: fluoride ligands vs. other halides
Studies of X–Ni–C6F4I⋯X–Ni–C6F4I halogen-bonded networks reveal pronounced differences between fluoride (X = F) and other halides: the 19F-MAS NMR spectrum is a sensitive probe of the halogen bond.
Polarisation effects on the solvation properties of alcohols
Alcohol solvents are significantly more polar than expected based on the measured H-bonding properties of monomeric alcohols in dilute solution.
Hydrogen bonding vs. halogen bonding: the solvent decides
Choice of solvent is used to direct the formation of either hydrogen bonds or halogen bonds in competitive self-assembly.
Halogen bonded Borromean networks by design: topology invariance and metric tuning in a library of multi-component systems
Borromean rings in black and white marble decorate Cappella Ruccellai (left, Florence) and were self-assembled under halogen bond control (right).
About this collection
Noncovalent interactions (hydrogen, noble gases, halogen, chalcogen, pnictogen, tetrel and triel bonds, as well as cation-π, anion-π, lone pair-π, π-π stacking, agostic, pseudo-agostic, anagostic, dispersion-driven, lipophilic, etc.) concern weak forces of attraction formed between different molecules (intermolecular) or fragments of the same molecule (intramolecular). While these weak interactions were firstly taken into consideration by van der Waals in 1873, the understanding of their crucial role in synthesis, catalysis, crystal engineering, pharmaceutical design, molecular biology, molecular recognition, materials, etc. has been increasingly explored in the last few decades. Thus, it is timely to establish a general/regular series of International Conferences on Noncovalent Interactions (ICNI), the first of which is to be held on 2-6 September 2019 in Lisbon. The conference aims to bring together scientists from around the world working on this field in order to exchange ideas, discuss recent advances and future directions/plans.
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