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There are two, almost identical Al O Fe bond pathways linking the 2NN pair, with 104 and 105° bond angles and the oxygen atoms on each pathway protonated.
The dominant mechanism that leads to NMR shifts in these systems is the hyperfine or Fermi contact shift, which is a short-range, through-bond interaction caused by the delocalization of unpaired electron density over local bond pathways (here, the Fe O Al or Fe O H bond pathways).
This is attributed to the high degree of sensitivity of the P hyperfine shift to the individual geometries and d-orbital occupancies of the M O-P (M O-Pe2+, Co2+, and Co3+) bond pathways.
This approach has been successfully applied to a range of systems, and novel modifications to it have even allowed the shift contributions from individual structurally distinct bond pathways to be assessed.
The potential pathways considered include (1) pathways proceeding via migratory insertion into the Rh H bond (pathways I, I-1, and I-2), (2) a potential pathway proceeding via migratory insertion into the Rh B bond (pathway II), and two potential competing routes to a β-borylated byproduct (pathway III).
The pathways have similar geometry as for the 1NN pair (94.8 and 103° bond angles, only one oxygen protonated) that has a positive shift contribution, so the negative shift contribution is likely related to the protonation of the oxygen atoms in the bond pathways (or possibly to incremental changes in the long-range structure that come about when Al substitutes into the 2NN position).
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To determine whether this equivalence is observed computationally, we compared the Co3+/2+ (M2)–O P and Co3+/2+(M2′)–O P bond pathway geometries, in the lowest-energy Li2/3CoPO4 supercell optimized ab initio (configuration a in the high-spin antiferromagnetic state).
These results signify the crucial role of the water vapor and the protic molecules in the creation of H+ charges and the hydrogen bonded pathways in the system.
These spectral features are related to the ligand folding, which opens an OPh pz)–CuII(dx2−y2) bonding pathway.
The supramolecular assembly of 3 was destined to evolve along two mutually exclusive pathways, namely one, which employs intermolecular O H⋯O H-bonds (pathway 1) and the other that sacrifices these for intramolecular O H⋯O H-bonds and settles for a crystal packing dictated by weak intermolecular interactions alone (pathway 2).
Others have written about this important research including Duke University's Evan MacLean and Brian Hare in an essay called "Dogs hijack the human bonding pathway".
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