AI Article Synopsis
- The study analyzed the effects of complexation on NMR signals for gold(III), palladium(II), and platinum(II) chloride complexes with picolines.
- It was observed that after forming these complexes, the (1)H and (13)C NMR signals shifted to higher frequencies, while the (15)N signals shifted to lower frequencies.
- The shielding effect of (15)N varied among complexes, showing increased shielding with the transition from Pd(II) to Pt(II) and decreased shielding with the trans to cis structural change.
Article Abstract
(1)H, (13)C and (15)N NMR studies of gold(III), palladium(II) and platinum(II) chloride complexes with picolines, [Au(PIC)Cl(3)], trans-[Pd(PIC)(2)Cl(2)], trans/cis-[Pt(PIC)(2)Cl(2)] and [Pt(PIC)(4)]Cl(2), were performed. After complexation, the (1)H and (13)C signals were shifted to higher frequency, whereas the (15)N ones to lower (by ca 80-110 ppm), with respect to the free ligands. The (15)N shielding phenomenon was enhanced in the series [Au(PIC)Cl(3)] < trans-[Pd(PIC)(2)Cl(2)] < cis-[Pt(PIC)(2)Cl(2)] < trans-[Pt(PIC)(2)Cl(2)]; it increased following the Pd(II) --> Pt(II) replacement, but decreased upon the trans --> cis-transition. Experimental (1)H, (13)C and (15)N NMR chemical shifts were compared to those quantum-chemically calculated by B3LYP/LanL2DZ + 6-31G**//B3LYP/LanL2DZ + 6-31G*.
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| http://dx.doi.org/10.1002/mrc.2378 | DOI Listing |
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