Potassium phthalocyanine, KPc: One-dimensional molecular stacks bridged by K+ ions

Serena Margadonna, Kosmas Prassides, Yoshihiro Iwasa, Yasujiro Taguchi, Monica F. Craciun, Sven Rogge, Alberto F. Morpurgo

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


We report the synthesis of potassium phthalocyanine (KPc) and its structural characterization by synchrotron X-ray powder diffraction. We find that while KPc adopts the β-polymorphic structural type (monoclinic space group P21/a) common for many MPc solids, its structure is characterized by unique features. The K+ ions, which are statistically disordered over two symmetry-equivalent positions, reside in the intrastack spacing of the rodlike molecular assemblies and strongly bond equidistantly to selected N atoms of the two neighboring Pc rings along the chain direction with an unusual 5-fold coordination. The K+-stuffed slipped stacks of Pc units display much greater intrastack and slippage distances than those of other β-MPc polymorphs. They may be thought as comprising disordered dimeric (Pc)22- units; this leads to electron pairing and is consistent with the observed nonmagnetic response of the system.

Original languageEnglish
Pages (from-to)10472-10478
Number of pages7
JournalInorganic chemistry
Issue number26
Publication statusPublished - 2006 Dec 25

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry


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