Self-Assembly of Luminescent Platinum-Salen Schiff-Base Complexes

✍ Scribed by Xingqiang Lü; Wai-Yeung Wong; Wai-Kwok Wong

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 453 KB
• Volume: 2008
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.200700858

✦ Synopsis

Abstract

Treatment of K~2~PtCl~4~ with the MeO‐salen Schiff baseH~2~L [H~2~L = N,N′‐bis(3‐methoxysalicylidene)ethylene‐1,2‐diamine] gave the precursor complex PtL, which, upon recrystallization from two different solvent mixtures, afforded different solvate forms of PtL·H~2~O (1) and PtL·DMF (2) with different solid‐state colors. The self‐assembly of the PtL precursor with K~2~Pt(CN)~4~ or K~2~Pd(CN)~4~ leads to the isolation of isostructural compound [K~2~(PtL)~2~Pt(CN)~4~]·1.5H~2~O (3) or [K~2~(PtL)~2~Pd(CN)~4~]·1.5H~2~O (4), respectively. The solid‐state structures of 1–4 were established by X‐ray crystallography. It is interesting that the helix of the PtL units, along with the other two homochiral helical arrangements of K^+^ and M^2+^ (M = Pt or Pd) ions, can generate a unique “fake” example of a triple‐stranded helix in a 1‐D helical polymeric chain. Two such triple‐stranded helical chains intertwining one another can give rise to a double‐stranded helix formed by intermolecular weak C–H···N hydrogen‐bonding interactions with a long helical pitch of ca. 56 Å. The optical absorption and photoluminescence properties of 1–4 were also examined.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)