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Comment on “optical properties of Ni[t-bu2P(O)NR]2. A paramagnetic d8 complex with planar structure”

✍ Scribed by Adam J. Bridgeman; Malcolm Gerloch

Book ID
103034802
Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
401 KB
Volume
247
Category
Article
ISSN
0009-2614

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✦ Synopsis

The origin of the triplet ground state in the recently synthesized paramagnetic, planar-coordinated complexes of nickel(II), Ni[t-bu2P(O)NR]2; R = i-propyl, c-hexyl, is ascribed to the small chelate bite angle in these molecules. The nature of the singlet-triplet crossover in planar d 8 complexes is addressed as are the roles of the steric activity of the open d shell and of ligand-field stabilization energies in achieving it. The paramagnetic moment and its temperature variation for the green form of the c-hexyl derivative are reproduced, together with the reported electronic spectrum, within the cellular ligand-field model.

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Reply to comment on “optical properties
Reply to comment on “optical properties of Ni[t-bu2P(O)NR]2. A paramagnetic d8 complex with planar structure”
✍ Hans-Josef Mink; Hans-Herbert Schmidtke 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 238 KB

For a proof whether the chelate angle is the root cause of a triplet level being the ground state of Kuchen's planar Ni(II) compounds, Bridgeman and Gerloch must use model parameter values which are derived from experiment. Their preliminary calculations employ parameters that are in conflict with t