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From a saturated solution of EtOC 6 H 4 N 2 NHN 2 C 6 H 4 OEt in aqueous ammonia and Cu(NH 3 ) 4  2+  dark brown Cu(EtOC 6 H 4 N 5 C 6 H 4 OEt) 2  (1) is obtained as an explosive precipitate. Upon heating in pyridine 1 is reduced to trimeric 1,5-bis(p-ethoxyphenyl)pentaazadienido copper(I) (2). 2 forms air-stable red crystals with the rhombohedral space group R3̄̄ and the lattice constants a = 1371.2(4) pm, α = 86.88(3)° and Z = 2. In 2 a linear Cu 3  3+  chain is coordinated by the atoms N 1, N 3 and N 5 of three pentaazadienido ligands, such that each Cu atom obtains a trigonal planar coordination by three N atoms.

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Synthese und Struktur von trimerem 1,5-Bis(p-ethoxyphenyl)pentaazadienidokupfer(I) — ein Komplex mit kurzen Cu—Cu-Kontakten in einer linearen Cu 3  3+ -Einheit / Synthesis and Structure of Trimeric 1,5-Bis(p-ethoxyphenyl)pentaazadienido-copper(I) — A Complex with Short Cu —Cu Contacts in a Linear Cu 3  3+  Unit