CN, coordination number

CN, coordination number. A CN of 5-6 means that the compound contains the Sn central atom in two different environments. 1, Bu2Sn0CH2CH20 2, methyl-4,6-0-benzylidene-a-D-glucopyranoside 3, methyl-4,6-0-benzylidene-a-D-mannopyranoside 4, o-lactobionic acid 5, o-galactose 6, Bu2Sn-DNA, maleic acid. 

C18-0085. Write the chemical formulas, including charge, of the complexes that form between the following metal cations and ligands (a) Fe " and CN", coordination number = 6 (b) and NH3, coordination number = 4 and (c) and ethylenediamine (en), coordination number = 6. 

Table 1.11 Effective crystal radii (CR) and ionic radii (IR) of Shannon (1976). CN = coordination number SP = spin sp = square planar py = pyramidal EIS = high spin LS = low spin data in A. 

CN coordination number, R interatomic bond distance, a Debye-Waller factor, AEo. correction of threshold energy and R factor residual factor. 

Radii are expressed in angstroms (A). CN, Coordination number. From Brown (1988). 

CN=coordination number fee = face-centered cubic hep = hexagonal close packing HTB = hexagonal tungsten bronze r.t. = room temperature s.g. = space group, TTB = tetragonal tungsten bronze. 

CN - coordination number Nf- average number of faces of the VDPs N t, - average number of non-bonding contacts per one U-O bond PVdp -volume of the VD polyhedron Svdp - total area of faces of the VDP Rsd- radius of the sphere with volume equal to that of the VDP Da -vector that originates in the U atom and ends in the centroid of the VD polyhedron G3-the second moment of inertia, which describes deviation of the VD polyhedron from ideal sphere A - difference between the shortest and the longest bonds in the coordination polyhedron p - total number of faces. Standard deviations are given in parentheses. 

Scheme 6 Formation of catalytically active species and pathway of butadiene insertion (CN coordination number)...

After Taylor and McLennan (1985) for trivalent cations CN, coordination number. 

The closest redox-stable analogue of Ce(IV) is thorium(IV), for which a large data base of thermodynamic parameters is available for the carboxylic add complexes (Martell and Smith 1977). Using the ionic radii of Shannon (1976) and recalling that the stability of lanthanide and actinide complexes is derived almost exclusively from electrostatics, we can estimate that a 16% increase in the log of the stability quotients for thorium (since AG oc Z /r oc log should provide a reasonable estimate for the corresponding complexes of cerium(IV) [rce(CN = 8) = 0.97 A, r iCN = 10) = 1.13 A, (l/rce)/(l/ xh) = 116, CN = coordination number]. 

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