Inorganic Chemistry, Vol.46, No.26, 11345-11355, 2007
Structural comparisons of silver(I) complexes of third-generation ligands built from tridentate (o-C6H4[CH2OCH2C(pz)(3)](2)) versus bidentate poly(1-pyrazolyl)methane units (o-C6H4[CH2OCH2CH(pz)(2)](2)) (pz = pyrazolyl ring)
The new bitopic, bis(1-pyrazolyl)methane-based ligand o-C6H4[CH2OCH2CH(pz)(2)](2) (L-2, pz = pyrazolyl ring) is prepared from the reaction of (pz)(2)CHCH2OH (obtained from the reduction of (pz)(2)CHCOOH with BH3 center dot S(CH3)(2)) with NaH, followed by the addition, of alpha,alpha'-dibromo-o-xylene. The reaction of L-2 with AgPF6 or AgO3SCF3 yields {o-C6H4[CH2-OCH2CH(pz)(2)](2)(AgPF6)}(n) or {o-C6H4[CH2OCH2CH(pz)(2)](2)(AgO3SCF3)}(n), respectively. Both compounds in the solid state have tetrahedral silver(l) centers arranged in a 1D coordination polymer network. The analogous ligand based on tris (1-pyrazolyl) methane units, o-C6H4[CH2OCH2C(pz)(3)](2) (L-3), reacts with AgO3SCF3 to form a similar coordination polymer, {o-C6H4[CH2OCH2C(pz)(3)](2)(AgO3SCF3)}(n). In this case, each tris(pyrazolyl) methane unit in L-3 adopts the kappa(2)-kappa(0) bonding mode. trystallization of a 3:1 mixture of AgO3SCF3 and L-3 yields {o-C6H4[CH2OCH2C(pz)(3)](2)(AgO3SCF3)(2)}(n), in which the tris(1-pyrazolyl) methane units adopt a kappa(2)-kappa(1) coordination mode.