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Palladium(II)-based cis,trans-1,3,5-triaminocyclohexane complexes demonstrating a variety of coordination modes and architectures

Seeber, Georg, Long, De-Liang, Kariuki, Benson and Cronin, Leroy 2003. Palladium(II)-based cis,trans-1,3,5-triaminocyclohexane complexes demonstrating a variety of coordination modes and architectures. Dalton Transactions (23) , pp. 4498-4504. 10.1039/B307616D

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Abstract

The reaction of cis,trans-1,3,5-triaminocyclohexane·3HX (L·3HX) with PdX2 (X = Br, Cl) affords a wide range of coordination complexes that represent the different coordination modes available to L. Monoligand complexes [Pd(LH)Cl2]Cl (1) and [Pd(LH)Br2]2[PdBr4] (2) demonstrate the bidentate coordination of L with the two cis amino ‘head’ groups chelating the palladium(II) ion and the third trans amino ‘tail’ group being protonated. Diligand complexes [Pd(LH)2]X (X = (NO3)43, (SO4)24) show a ‘head-to-head’ coordination mode with the protonated trans amino groups adopting a conformation that positions them opposite to each other. Both sets of amino groups are engaged in coordination in a cyclic ‘head-to-tail’ fashion found in the hexanuclear ring clusters [{Pd(L)X}6]X6 (X = Cl 5, Br 6). 5 and 6 are isostructural, both in the solid state and in solution, despite accommodating six chloro or bromo ligands into the cluster framework. A trinuclear complex [Pd{Pd(L)Cl2}2Cl2] (7) reveals ‘tail-to-tail’ coordination of two ligands for the centre palladium(II) ion in addition to their ‘head’ amino groups individually chelating other palladium(II) ions. Complexes 1–7 were characterised by single-crystal X-ray diffraction, elemental analysis, IR and by NMR spectroscopy (1–6).

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Publisher: American Chemical Society
Last Modified: 04 Jun 2017 04:59
URI: http://orca-mwe.cf.ac.uk/id/eprint/47205

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