Synthesis and crystal structures of two potential gem-di(pyrazolyl)cycloalkane ligands, 1,1-di(pyrazolyl)cyclohexane [C6H10(C3N2H3)(2)] and 1,1-di(pyrazol-1-yl)cyclopentane [C5H8(C3N2H3)(2)]

The species 1,1-di(pyrazol-1-yl)cyclohexane, C12H16N4, crystallizes in the monoclinic space group P2(1)/c with a = 8.340(2), b = 14.281(5), c = 10.153 (3) Angstrom, beta = 106.86(2)degrees, and Z = 4. The cyclohexane moiety ha s the chair conformation. The congener, 1,1-di(pyrazol-1-yl) cyclopentane, C11H14N4, while not isomorphous, also crystallizes in space group P2(1)/c w ith a = 14.350(2), b = 6.776(1), c = 11.043(2) Angstrom, beta = 100,68(1)de grees, and Z = 4. The cyclopentane ring has a conformation in which four ca rbon atoms are essentially coplanar, while the fifth (that with the two pyr azolyl substituents) lies 0.63 Angstrom from this plane, resulting in a ben d of 41.3 degrees across the C(2)...C(5) vector. The hydrogen atoms in each structure were located directly and their coordinates refined.