Unique Formation of a Crystal Phase Containing Cyclic Oligomers and Helical Polymers of the Same Monomeric Fragment

Norberto Masciocchi; G Attilio Ardizzoia; Girolamo LaMonica; Angelo Maspero; Angelo Sironi

doi:10.1002/(SICI)1521-3773(19981231)37:24<3366::AID-ANIE3366>3.0.CO;2-Z

Unique Formation of a Crystal Phase Containing Cyclic Oligomers and Helical Polymers of the Same Monomeric Fragment

Angew Chem Int Ed Engl. 1998 Dec 31;37(24):3366-3369. doi: 10.1002/(SICI)1521-3773(19981231)37:24<3366::AID-ANIE3366>3.0.CO;2-Z.

Authors

Norberto Masciocchi¹, G Attilio Ardizzoia², Girolamo LaMonica², Angelo Maspero², Angelo Sironi¹

Affiliations

¹ Dipartimento di Chimica Strutturale e Stereochimica Inorganica, Università di Milano, via Venezian 21, I-20133 Milano (Italy), Fax: (+39) 02-7063-5288.
² Dipartimento di Chimica Inorganica, Metallorganica e Analitica and Centro C.N.R., Università di Milano, via Venezian 21, I-20133 Milano (Italy).

Abstract

The yellow, microcrystalline compound [Cu(pymo)] (Hpymo=2-hydroxypyrimidine) has been characterized with the newly emerging technique of ab initio X-ray powder diffraction. A unique and unprecedented crystal phase containing cyclic oligomers and infinite helical polymers (see picture) of the same monomeric fragment is selectively formed upon reaction of [Cu(CH₃ CN)₄ ][BF₄ ] and Hpymo with NEt₃ .

Keywords: Copper; Cyclooligomerizations; Polymers; Structure elucidation; X-ray powder diffraction.