Hybridization schemes for co-ordination and organometallic compounds

Michael, D.; Mingos, P.; Lin, Zhenyang

doi:10.1007/bfb0058196

Cited by 7 publications

(1 citation statement)

References 45 publications

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“…The hafnium atom is surrounded by two nitrogen atoms and six oxygen atoms ( Figure 7 b) from two different NTA molecules. The coordination polyhedron of the Hf1 atom is a distorted dodecahedron, in which the hafnium atom has the sp 3 d 4 configuration [ 33 ].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Hafnium(IV) Polyaminoacetates

et al. 2021

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The interaction of hafnium(IV) salts (oxide-dichloride, chloride, and bromide) with nitrilotriacetic acid (NTA), diethylenetriamminepentaacetic acid (DTPA), 1,2-diaminocyclohexanetetraacetic acid (CDTA), 1,3-dipropylmino-2-hydroxy N,N,N′,N′-tetraacetic acid (dpta), and N-(2-hydroxyethyl)ethylenediamine triacetic acid (HEDTA) has been studied. The corresponding complexes Na2[Hf(NTA)2]·3H2O (1), Na[HfDTPA]·3H2O (2), [HfCDTA(H2O)2] (3), and Na[Hf2(dpta)2]·7.5H2O·0.5C2H5OH (4) have been isolated and characterized and their structures have been determined by single crystal X-ray diffraction. Biological studies of [HfCDTA(H2O)2] have shown that in 5% glucose solution this complex has low toxicity and good contrasting ability.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Hafnium(IV) Polyaminoacetates

et al. 2021

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Pauling's criterion of bond strength and the relative bond lengths in molecule ML_k

Zhan

1991

Int J of Quantum Chemistry

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In this paper, the bond strengths, defined by Pauling, for a series of molecules in the type of MLI, have been calculated by using the generalized method obtained from the maximum overlap method in a preceding paper and by using Pauling's pair-defect-sum approximation. A number of geometrical bonding situations are investigated. It is demonstrated why a previous study purporting to use the Pauling's criterion of bond strength to find that the axial bonds in trigonal bipyramidal ML5 are stronger than the equatorial bonds is incorrect. The results obtained from the two methods approach each other and are in good agreement with the experimental bond lengths, which show that Pauling's criterion is viable and that the pair-defect-sum approximation is indeed an excellent one that agrees with the maximum overlap method.

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