Phosphorus bond lengths

The CSD reveals that the mean zinc phosphorus bond length is 2.404(5) A based on all singlecrystal X-ray structural data in the database and uncorrected for temperature. 

Figure 32 Phosphorus 3p2 orbital contribution (dark area) to the total DOS (dashed line) of the three-dimensional Mn2P22 lattice. The phosphorus-phosphorus bond length here is 2.4 A. The dotted line is an integration, on a scale of 0-100%, of the 3pz orbital occupation.

Similar reactions using 1,3-cyclooctadiene, chromium atoms, and PF3 led only to the t] 5-(cycloocta-l,3-dienyl) hydrido tris(trifluorophos-phine)chromium complex [Cr(C8Hn)(PF3)3H] (7), whose structure has been established by X-ray crystallography (125). (See also Section VIII). The chromium-phosphorus bond lengths [ave. 2.146(3) A] are, as expected, particularly short. 

Table 1-3. Metal-phosphorus bond lengths and chelate angles of metal chelates of dppf... 

We have also investigated the effect on the cone angle calculations of using the crystallographically determined M-P distance rather than the putative 2.28 A distance proposed by Tolman. The 2.28 A distance is smaller than the mean M-P distance of 2.32(9) A calculated for all triphenylphosphine complexes. The calculated mean cone angle based on observed metal-phosphorus distances is 146.9(6)° which contrasts with an angle of 148(5)° based on the standard metal-phosphorus bond length proposed by Tolman. 

Note V correlates strongly with the platinum phosphorus bond length. 

The P-F bond length is very similar to the free ligand value, and the nickel-phosphorus bond length is very short indeed since the normally accepted covalent radius of phosphorus is 1.1 OA and that of atomic... 

A single crystal X-ray structure determination of 2,4,6-tri-tert-butyl-1,3,5-triphosphinine (11a) also provided indications for the aromatic nature of these heterocyclic compounds. The analysis shows a planar, hexagonal basic skeleton with average carbon-phosphorus bond lengths of 1.727 A, a value lying between those for carbon-phosphorus single and double bonds [14,23]. 

The resultant of aU the influences on n (and o) bonding is generally reflected in the large variations in metal-phosphorus bond lengths which are observed in different complexes with the same metal atom, and sometimes with the same phosphine group. 

TABLE 8.18 Observed Ranges of Metal-Phosphorus Bond Lengths (A) ... 

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