Two New Pyridyl-Substituted Tris(pyrazolyl)borate Ligands and Their Potassium Salts

The hydrotris(5-methyl-3-py*-pyrazolyl)borate ligands
Tp3Py,Me (py* = 3-pyridyl) and TpPic,Me (py*
= 5-α-picolyl)
were synthesized from the corresponding pyrazoles and KBH4.
They were crystallized as their hydrated potassium
salts. In the solid state KTp3Py,Me·H2O
is a coordination polymer in which two of the three pyridine nitrogens
of
each Tp3Py,Me ligand are used to coordinate neighboring
potassium ions. KTpPic,Me·2H2O
consists of dimers held
together by pairs of K−N(pyridine) interactions.
KTp3Py,Me·H2O crystallizes in the
triclinic space group P1̄ with
a = 8.893(2) Å, b = 11.733(2) Å,
c = 13.272(2) Å, α = 75.48(1)°, β =
82.93(2)°, γ = 88.43(2)°, and Z =
2.
KTpPic,Me·2H2O crystallizes in the
triclinic space group P1̄ with a =
9.481(2) Å, b = 11.613(1) Å, c =
15.516(1)
Å, α = 76.68(1)°, β = 75.13(1)°, γ =
89.60(1)°, and Z = 2.