The potentially tridentate 1,4,7-triazacyclononane (tacn) is used extensively. Tri-protonated tacn reacts with K2PdCl4 affording salts of [Pd(tacn)(Htacn)]3+ with one of the unbound nitrogen atoms cationic (A. J. Blake, L. M. Gordon, A. J. Holder, T. I. Hyde, G. Reid, M. Schröder, J. Chem. Soc., Chem. Commun. , 1988 , 1452). What structural feature of [Pd(tacn)(Htacn)]3+ is surprising? How do the authors rationalize this feature? Propose an alternative explanation keeping in mind that the hydrogen that results in the positively charged and non-Pd bound nitrogen could not be located in the Figure 1 drawing. Oxidation of [Pd(tacn)2]2+ affords [Pd(tacn)2]3+ . Sketch the [Pd(tacn)2]3+ structure (incorrectly identified in Figure 3 of the reference), and label the bond lengths (with their distances) that define its Jahn–Teller distortion.
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