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Polar and non-polar polytypoids based on the same polymer backbone

AutorFalvello, Larry R.; Dobrinovich, Isabel T.; Forcén-Vázquez, E.; Mayoral, Isabel; Tomás, Milagros
Fecha de publicación2016
CitaciónSCTE (2016)
ResumenA set of polytypoids (analogous to polytypes but with differences in chemical composition) provide a useful vehicle for studying the role of non-covalent interactions in establishing the packing arrangements in molecular solids. A group of 1D copolymers based on the same heterometallic {[Cubipy][Co(Orot)2bipy]}n backbone, seen in the Figure, presents both polar and centric modifications (H2Orot = orotic acid, C5H4N2O4; bipy = 2,2\'-bipyridyl, C10H8N2). In each link of the chain, Co and Cu are coordinated to one 2,2\'-bipyridyl ligand each, with the orotate groups acting as bridges. Each unit of the polymer contains hydrogen-bond donor and acceptor groups as well as aromatic groups that can participate in π…π interactions. Further coordination of copper by chloride yields a centric crystal structure in space group P(-1), while coordination by an aqua ligand at the same site yields a polar crystal with the acentric space group P1. Structural evidence points to the formation of non-covalent interactions as the driving force for the appearance of one structure or the other. The polar structure, moreover, undergoes a single crystal to single crystal transformation to produce a second polar structure with the same copolymer backbone. The structural features and non-covalent forces are compared and discussed.
DescripciónPóster presentado a la 20th International Conference on Solid Compounds of Transition Elements, celebrada del 11 al 15 de abril de 2016 en Zaragoza (España).
URIhttp://hdl.handle.net/10261/148854
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