Two dinuclear pyrophosphate-bridged copper(II) complexes displaying unusually strong OHO interactions
The crystal and molecular structures of two copper(II) dinuclear complexes bridged by the inorganic pyrophosphate tetraanion, namely, [Cu(bipy)(cis-H 2P 2O 7)] 2·3H 2O 1 and [Cu 2(terpy) 2(HP 2O 7)] ·2H 2O(OH) 2, are reported (bipy = 2,2′-pyridine; terpy = 2,2′:6′,2″-terpyridine). Both compounds are...
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| Autores principales: | , , , |
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_13877003_v22_n_p141_Perec |
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| Sumario: | The crystal and molecular structures of two copper(II) dinuclear complexes bridged by the inorganic pyrophosphate tetraanion, namely, [Cu(bipy)(cis-H 2P 2O 7)] 2·3H 2O 1 and [Cu 2(terpy) 2(HP 2O 7)] ·2H 2O(OH) 2, are reported (bipy = 2,2′-pyridine; terpy = 2,2′:6′,2″-terpyridine). Both compounds are characterized by two very strong OHO interactions which play a fundamental role in their crystal structure building. Compound 1 is identical to the recently reported compound 1a (Marino et al. Inorg. Chem. 50 (2011) 378-389), except for the supramolecular interaction which is revised in the present communication. Analysis of our data for 1 reveals the existence of a strong double well OH-O′ ↔ O-(HO)′ interaction around an inversion center (OO: 2.433(2) Å), which binds dinuclear units together into [100] polymeric chains. Dinuclear compound 2 is monoclinic, halved by a twofold axis bisecting it through the central O atom of the bridge. The extreme disorder found in the solvates in 2 prevented an accurate description of the solvato content, and a detailed analysis of the H-bonding scheme. However, the extremely short O-O = 2.473(2) Å intermolecular distance points to a (quasi) symmetrical OHO interaction. © 2012 Elsevier B.V. All rights reserved. |
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