X-ray crystal structures of [HB(3,4,5-Me(3)pz)(3)](2)Zn, [H2B(3,4,5-Me(3)pz)(2)]Zn(mu-3,4,5-Me(3)pz)(2)Zn[H2B(3,4,5-Me(3)pz)(2)], and [H2B(pz)(2)](2)Zn (pz = pyrazolyl ring)

[HB(3,4,5-Me(3)pz)(3)](2)Zn (1) and [H2B(3,4,5-Me(3)pz)(2)]Zn(mu -3,4,5-Me( 3)pz)(2)Zn[H2B(3,4,5-Me-3 pz)(2)] (2) are present in equal amounts in a cry stal in the triclinic space group, P-I with a = 11.5924(11) Angstrom, b = 1 2.7799(12) Angstrom, c = 15.7317(14) Angstrom alpha = 107.905(2)degrees, be ta = 96.796(2)degrees, gamma = 105.786(2)degrees, and Z = 1. The structure of I is a trigonally distorted octahedron and is very similar to the struct ure of [HB(3,5-Me(2)pz)(3)](2)Zn showing that the introduction of the third methyl group on the pyrazolyl ring does not impact on structure. [H2B((PZ) )(2)](2)Zn (3) is orthorhombic, Pca2(1) with a = 10.1473(3) Angstrom, b = 1 1.1117(2) Angstrom, c = 14.1831(5) Angstrom, alpha = beta = gamma = 90 degr ees and Z = 4. The zinc(II) centers in both 2 and 3 are similar and have ps eudotetrahedral structures.