Deciphering supramolecular isomerization in coordination polymers: connected molecular squares vs. fused hexagons

Abstract

Supramolecular isomerization in coordination polymers is demonstrated by using bis(tridentate) polypyridyl ligands and bent dicarboxylate linkers.

N^N^C-Cyclometalated rhodium(iii) complexes with isomeric pyrimidine-based ligands: unveiling the impact of isomerism on structural motifs, luminescence and cytotoxicity

“…the ability of compounds with identical molecular formulae to exist in spatially different forms is one of the most fundamental ideas in chemistry. [1][2][3] Revealing the impact of isomerism on crystal structures, [4][5][6][7][8][9][10][11][12] and chemical properties, [13][14][15][16][17][18][19][20][21] as well as physical [22][23][24][25][26][27][28][29][30][31][32][33][34] and biological properties [35][36][37][38][39] is of particular importance for establishing structure-property relationships which pave the way toward the more predictable design of substances with desirable properties. Despite various kinds of constitutional and configurational isomerism of metal complexes being well known, 40 ligand isomerism, which belongs to constitutional isomerism, is documented in literature to a considerably lesser extent than other types of the isomerism of complexes.…”

Polymorphism in carboxamide compounds with high-Z′ crystal structures

“…17 The structures will be reported as conformational polymorphs when molecules in the compounds contain flexible fragments and show several possible conformations. 18 The structures can be resulted as packing polymorphs if they consist of small and rigid molecules with minimal differences in their conformations and the same synthons which are constructed with directional hydrogen-bond interactions. 19 However, the recognition between conformational polymorphism and packing polymorphism is not entirely clear for most polymorphic structures.…”