NMR studies on a palladium(II) complex containing an incompletely coordinated facultative pentadentate Schiff base ligand
✍ Scribed by Edmund Kwiatkowski; Grzegorz Romanowski
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 102 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0749-1581
- DOI
- 10.1002/mrc.1129
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✦ Synopsis
Palladium(II) dichloride reacts with 1,10-bis(2-pyrrolyl)-2,5,9-triaza-1,9-decadiene to give a [Pd(C 15 H 20 N 5 )]Cl complex in which the ligand is four-coordinated, leaving one pyrrole group dangling. By using COSY, gHSQC, gHMBC connectivities and NOE experiments it has been concluded that one linkage isomer exists in DMSO solution, in spite of the fact that different sets of N atoms of potentially pentadentate ligand might be involved in coordination, and that the three chelate rings in the complex cation are arranged in a sequence: five-membered, six-membered, five-membered which is different from that (5-5-6) found by x-ray studies on the related [Ni(C 15 H 20 N 5 )]Cl compound. NMR studies allowed an unambiguous assignment of all 1 H and 13 C NMR resonances for the complex. Results of x-ray structural analysis of [Pd(C 15 H 20 N 5 /](CH 3 COO)H 2 O supported the five-membered, six-membered, five-membered ring sequence in the [Pd(C 15 H 20 N 5 /] + complex cation and show an E (trans) orientation of the dangling pyrrole group with respect to the metal center.