The articles and highlights presented at the second CrystEngComm meeting, held in Nottingham September 2004 are reviewed. discussion has highlighted current development of crystal engineering allowed to emerge some its future potentials. In particular, papers described this highlight focus on four fundamental aspects: (i) intermolecular interactions: evaluation application design; (ii) networks: design applications; (iii) approaches synthesis; (iv) polymorphism, solvates chiral resolution.

Reactions that occur within or between molecular crystals, in particular those reactions are activated by mechanical methods, reviewed. The focus is on processes (whether intrasolid intersolid) controlled primarily supramolecular bonding, such as template cycloadditions, formation of inclusion compounds, crystals the reassembling noncovalent bonds, and complexes coordination compounds. It proposed solvent-free mechanochemical for example, cogrinding, milling, kneading, represent viable...

The intermolecular interactions between X−H groups (X = C, N, and O) metal atoms in crystalline organometallic complexes have been investigated. Molecular crystal structures determined by neutron and/or X-ray diffraction data retrieved from the Cambridge Structural Database. comparative analysis of H---M X---M distances as well that X−H---M angles allows a discrimination behavior electrophilic nucleophilic centers. Two novel types characterized: (i) multicenter hetero-acceptor (IMH) hydrogen...

This Dalton Perspective deals with solvent-free reactions taking place within solids or between involving a solid and vapour. The focus is on organometallic coordination compounds occurring via reassembling of non-covalent bonding, e.g. hydrogen bonds, and/or formation ligand-metal bonds. It argued that activated by mechanical mixing reactants as well those obtained exposing crystalline to vapour can be exploited "make crystals", which the quintessence crystal engineering. demonstrated...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen Bonding in Organometallic Crystals. 2. C-H.cntdot. .cntdot. .cntdot.O Hydrogen Bonds Bridged and Terminal First-Row Metal CarbonylsDario Braga, Fabrizia Grepioni, Kumar Biradha, V. R. Pedireddi, Gautam DesirajuCite this: J. Am. Chem. Soc. 1995, 117, 11, 3156–3166Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published inissue 1 March...

The first CrystEngComm discussion meeting on crystal engineering has demonstrated that the field reached maturity in some areas (for example: design strategies, characterization of solid compounds, topological analysis weak and strong non-covalent interactions), while quest for novel properties engineered at molecular supramolecular levels only recently begun need further research efforts is strongly felt. This Highlight article aims to provide a forward look constructive prospects future...

Supramolecular reactions between crystalline materials as well a material and vapour can be used to generate new substances. These solvent-free processes exploited prepare both hydrogen-bonded co-crystals coordination networks. Solid-vapour do not differ from solid-vapour uptake/release processes, also polymorphs solvates. It is argued that solvent-less involving molecular crystals represent green route supramolecular solid-state chemistry crystal engineering.

Pressing solid barbituric acid with KBr to prepare samples for IR spectroscopy leads the formation of an ionic co-crystal, in which co-former is a classical salt; co-crystal also obtained other alkali bromides (LiBr, NaBr, RbBr and CsBr) caesium iodide. The simultaneous presence halide ions affects dissolution properties water.

Engineering crystal properties by a choice of adequate molecular building blocks has to cope with the fact that given molecule can be isolated in many, at times very solid forms (single entity crystals, solvates, salts, co-crystals and their polymorphs) each its own characteristics properties. Preparation new same molecule, investigation relationship among represent not only further challenge state chemists, but also an opportunity modifying crystals applicative implications...

Crystalline 1,8-naphthalimide derivatives bearing a bromine atom at the 4-position and 2-, 3-, or 4- methylpyridine imidic N-position have been synthesized, their co-crystals with coformer 1,4-diiodotetrafluorobenzene obtained via mechanochemistry. The structure of crystals has characterized by means X-ray diffraction Raman IR analysis. luminescence properties explored both in solution solid co-crystals. All compounds exhibit weak fluorescence air-equilibrated solutions room temperature...

Abstract Five new polymorphs and one hydrated form of 2‐thiobarbituric acid have been isolated characterised by solid‐state methods. In both the crystalline II in hydrate form, molecules are present enol whereas only keto isomer is forms I (reported 1967 Calas Martinex), III , V VI . IV on other hand, a 50:50 ordered mixture enol/keto present. All single‐crystal X‐ray diffraction, 1D 2D ( 1 H, 13 C, 15 N) NMR spectroscopy, Raman spectroscopy powder diffraction at variable temperature. It has...

Inorganic crystal engineering is the modelling, synthesis and evaluation of properties crystalline materials obtained from inorganic, organometallic bioinorganic building blocks. This article will take reader across this interdisciplinary field research supramolecular to chemistry biominerals following collection papers presented at Dalton Discussion on Crystal Engineering held University Bologna. The focus not only be preparation characterisation supermolecules, co-ordination networks,...

Architecture, stability, and behavior with temperature of the hexafluorophosphate salts [(C5H5)2Co][PF6] (1), [(C5H5)2Fe][PF6] (2), [(C6H6)2Cr][PF6] (3), [(C6H5Me)2Cr][PF6] (4) have been investigated. Crystals 1 2 measured by variable-temperature X-ray diffraction differential scanning calorimetry. The phase-transitional [(C5H5)2Co][PF6], which undergoes two fully reversible crystal-to-crystal phase transitions, has compared known [(C5H5)2Fe][PF6]. room- low-temperature phases (form I form...

The intermolecular interactions between X−H donors (X = C, N, O) and electron-rich π-ligands (alkynes, arenes, cyclopentadienyl ligands) in crystalline organometallic complexes have been investigated from data retrieved the Cambridge Structural Database. Intermolecular X−H---π are weak hydrogen bonds following common order of acidity HOH > HNH HCH but become more effective packing determinants when "charge-assisted" by presence an ionic charge (X−Hδ+---πδ-).