Molecular solid solutions for advanced materials – homeomorphic or heteromorphic

Abstract

Materials are often functionalised using diverse molecular designs. This is in stark contrast to inorganic materials, whose properties are diversified by designing a blend of atoms/ions in a solid solution...

Multicomponent Molecular Assembly of Fluorescent Organic Semiconductors Beyond Three Compounds

“…[28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] Binary organic cocrystals were commonly obtained by weak noncovalent interactions involving hydrogen bonding, [28][29][30][31] chargetransfer, [32][33][34][35][36][37] and halogen bonding interactions, [38,39] while alloys are constructed by substitution of structurally matched guest molecules at the host sites. [40][41][42][43][44][45] While binary heterostructures capable of producing well-defined micro-and nanoscale interfaces can be viewed as partially compatible combinations. [46][47][48][49][50] Good epitaxial relationship between two diverse components would be necessary to access heterostructured micro-and nanocrystals.…”

Effect of halide solid solution on the structure, phase transition behaviour and dielectric properties of dabcoH+ chains

“…The phase transition behaviour and molecular motility in the crystals are less dependent on the composition. However, there are examples of molecular crystalline solid solutions whose phase transition behaviours and molecular mobilities are composition-dependent; [35][36][37][38][39] for example, solid solutions partially substituted with different halogens. CM (cyclohexylmethylammonium) salts undergo a phase transition at a temperature that depends on composition.…”

Homogeneous and Heterogeneous Self‐Assembly of Luminescent Pyromellitic Dianhydride‐Based Charge‐Transfer Complexes

“…[22][23][24] Alternatively, organic alloys are also preliminarily developed by random substitution of a host matrix with structurally matched guest molecules. [30][31][32][33][34][35][36] A representative case is that a 9,10-bis(phenylethynyl)anthracene (BA) host with a planar molecular geometry can provide lattice sites to allow for the occupation of structurally twisted 5,12bis(phenylethynyl)naphthacene (BN) over a wide composition range, giving homogeneous alloys of BA and BN. [30] Apart from these, the heteroepitaxial growth of one organic compound onto the prefabricated organic crystals is also accessible when the epitaxial relationships between two 𝜋-conjugated materials are met.…”

“…[ 19–21 ] Among them, binary organic assembled architectures are of particular interest considering that new crystal structures and/or functionality may be involved. [ 22–40 ] Based on the spatial distribution of two constituent materials, these binary assemblies can be divided into homogeneous and heterogeneous structures. The binary material combinations capable of generating periodic molecular arrangements or random molecular substitutions are considered homogeneous systems, whereas the combinations capable of producing heterogeneous interfaces at the micro‐ and nanoscale are viewed as heterogeneous systems.…”

“…[ 36 ] The former corresponds to organic cocrystals with fixed stoichiometric ratios or organic alloys with arbitrary stoichiometric ratios in which noncovalent intermolecular interactions between two components such as charge‐transfer (CT), hydrogen‐bonding, and host‐guest inclusion interactions or their similarity in molecular shapes and sizes should be guaranteed. [ 9,22–36 ] On the contrary, the selective growth of one component onto the pre‐existing crystals of another component gives rise to heterostructured architectures. [ 37–40 ] The rational creation of new heterogeneous interfaces across different scales in these binary organic assemblies facilitates photon and charge transport and may lead to integrated or improved optoelectronic performance applications.…”