Synthesis and Structural Aspects of Two Trinuclear Cyano-bridged Heterometallic Complexes with Monodentate Coordination of Perchlorate and Acetate Anions

Two new cyano-bridged trinuclear heterometallic complexes [Ca(2)(phen)(4)(ClO(4))(H(2)O)(3)-Fe(CN)(6)] H(2)O (1) and [Ca(2)(phen)(4)(CH(3)COO)(H(2)O)(3)Fe(CN)(6)] 2H(2)O (2) (where phen = 1,10 phenanthroline) have been synthesized and characterized by single-crystal X ray diffraction techniques IR spectroscopy and thermogravimetric analysis The structure of complex 1 features a central [Fe(CN)(6)](3-) unit that links a monocation [Ca(phen)(2)(H(2)O)(ClO(4))](+) and a dication [Ca(phen)(2) (H(2)O)(2)](2+) via two trans cyanide bridges Similarly complex 2 also features a central [Fe(CN)(6)](3-) unit that links a monocation [Ca(phen)(2)(H(2)O)(CH(3)COO)](+) and a dication [Ca(phen)(2)(H(2)O)(2)](2+) via two trans cyanide bridges In 1 and 2 both Ca centers are seven-coordinated and achieve a pentagonal bipyramidal geometry whereas the Fe center in both the complexes possesses a distorted octahedral geometry Intra- and intermolecular hydrogen bonding networks are present in 1 and 2 that impart the overall molecular stability to both the systems