New methoxo-, hydroxo-, and pyrazolate-bridged complexes of rhodium(III). Crystal structures of [{Rh(C5Me5)}2(mpz)(OMe)2][ClO4](mpz = 3-methylpyrazolate), [{Rh(C5Me5)}2(Hdmpz)2(OH)2][BF4]2(Hdmpz = 3,5-dimethylpyrazole), and [{Rh(C5Me5)}2(pz)2(OH)]-[C