A series of tetradentate dimeric salicylaldimine ligands (H 2LnRm) with terminal chains of variable length (Rm) and a central flexible (CH2)n spacer (Ln = 10 and 12) was synthesized, For all ligands, according to their rod-like molecular shape, mesomorphism characteristic of calamitic systems (nematle and smectic C phases) is observed, The reaction with ZnII acetate dihydrate afforded a series of ZnLnRm derivatives (1-6) that show mesomorphic behaviour only in the presence of the longest terminal tails (R12). Interestingly, the flexibility of the very long spacer in the central core and the presence of the tetrahedral ZnII centre introduce nonlinearity in the central part of the molecule, responsible for the appearance of an intercalated smectic C mesophase, Moreover, the coordination of the ZnII ion to the salen-like framework induces, in all the corresponding complexes, interesting blue-light-emitting properties at room temperature in dichloromethane solution (EQY in the 19-22% range at about 450 nm), as well as in the solid (EQY: 9% at about 450 nm) or, when present, in the mesophase (EQY 8% at 440 nm), © Wiley-VCH Verlag GmbH & Co. KGaA.

Coordination Induction of Nonlinear Molecular Shape in Mesomorphic and Luminescent Zn(II) Complexes Based on Salen-Like Frameworks

D. Pucci;I. Aiello;BELLUSCI, Anna;A. Crispini;M. Ghedini;M. La Deda
2009

Abstract

A series of tetradentate dimeric salicylaldimine ligands (H 2LnRm) with terminal chains of variable length (Rm) and a central flexible (CH2)n spacer (Ln = 10 and 12) was synthesized, For all ligands, according to their rod-like molecular shape, mesomorphism characteristic of calamitic systems (nematle and smectic C phases) is observed, The reaction with ZnII acetate dihydrate afforded a series of ZnLnRm derivatives (1-6) that show mesomorphic behaviour only in the presence of the longest terminal tails (R12). Interestingly, the flexibility of the very long spacer in the central core and the presence of the tetrahedral ZnII centre introduce nonlinearity in the central part of the molecule, responsible for the appearance of an intercalated smectic C mesophase, Moreover, the coordination of the ZnII ion to the salen-like framework induces, in all the corresponding complexes, interesting blue-light-emitting properties at room temperature in dichloromethane solution (EQY in the 19-22% range at about 450 nm), as well as in the solid (EQY: 9% at about 450 nm) or, when present, in the mesophase (EQY 8% at 440 nm), © Wiley-VCH Verlag GmbH & Co. KGaA.
Intercalated smectic phase; Metallomesogens; Nonlinear shape; Schiff bases; Zinc
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/128088
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