| Abstract
| - We have prepared and characterized ionic compounds containing linear or zigzag chains of copper ions. For[Cu3(DPhIP)2](CuCl2) (1), in addition to the well-known [ClCuCl]- anion, there is a cation with a linear chainof three Cu atoms bridged by two DPhIP anionic ligands (DPhIP represents the anion of 2,6-diphenyliminopiperidine). Each cation has weak interactions with two adjacent CuCl2- anions, and each anion interacts with twoneighboring [Cu3(DPhIP)2]+ cations forming an infinite zigzag chain of CuI atoms. Also reported here is thelinear tetracopper chain cation in [Cu4(DPhIP)4][CuCl2]2 (2). The [Cu4(DPhIP)4]2+ cation has approximate D2dsymmetry. There are three Cu···Cu distances of 2.518(2), 2.479(2), and 2.525(2) Å. The terminal Cu atoms are2-coordinate CuI while the two inner Cu atoms are 4-coordinate CuII. In spite of the diamagnetic nature of thiscompound, molecular orbital calculations (by various DFT techniques) indicate that no direct Cu−Cu bonds arepresent; instead the bridging ligand effects a strong coupling of the spins.
- An infinite zigzag copper chain has been made and crystallographically characterized, and a linear tetracopper complex has been made for the first time. Although magnetic susceptibility measurements show the absence of unpaired electrons, DFT calculations reveal no direct Cu−Cu bonding.
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