Synthesis, spectroscopic, and structural aspects of two trinuclear cyano-bridged heterometallic complexes

Abstract

Two new cyano-bridged trinuclear heterometallic complexes [Sr 2 (Phen) 4 (CF 3 CO 2 )(H 2 O) 3 Fe(CN) 6 ]·2H 2 O (1) [Ca 2 (Phen) 4 (CF 3 CO 2 )(H 2 O)Co(CN) 6 ]·2H 2 O (2) (where Phen = 1,10-phenanthroline) have been synthesized and their crystal structures have been determined. The structure of complex (1) features a central [Fe(CN) 6 ] 3− unit that links a monocation, [Sr(Phen) 2 (OH 2 )(OOCCF 3 )] + and a dication, [Sr(Phen) 2 (OH 2 ) 2 ] 2+ via two trans cyanide bridges. The complex (2) features a central [Co(CN) 6 ] 3− unit that links two monocations of [Ca(Phen) 2 (OH 2 )(OOCCF 3 )] + (the positions of the trifluoro acetate and water molecules are disordered over two positions) via two trans cyanide bridges. Each metal atom is seven coordinated and achieves pentagonal bipyramidal geometry. Two cocrystallized water molecules are present in both the complexes. The presence of an extensive network of hydrogen bonding imparts the overall stability to both the systems.

Interplay of thermochemistry and Structural Chemistry, the journal (volume 17, 2006) and the discipline

“…The study by Samanta et al [85] reported in the next paper was initiated by remarkable diversity of structural types of cyano-bridged mixed valence complexes. Two novel trinuclear cyano-bridged heterometallic complexes with the formula [M 2 (Phen) 4 (CF 3 CO 2 )(H 2 O) 3 M'(CN) 6 2 .…”

The first three-dimensional FeIII–SrIIheterometallic coordination polymer: poly[[diaquatetrakis(μ3-pyridine-2,3-dicarboxylato)diiron(III)strontium(II)] dihydrate]

“…Secondly, the broad span of coordination numbers of alkaline earth metals makes the topologies of the resulting coordination polymers difficult to control. Some rare examples of Fe-Sr heterometallic coordination complexes have been reported (Xu et al, 2015;Herbert et al, 2013;Samanta et al, 2006;Prodius et al, 2006), and most of them are trinuclear (Samanta et al, 2006;Prodius et al, 2006) or tetranuclear complexes (Herbert et al, 2013), or one-dimensional chain structures (Xu et al, 2015). Until now, no Fe-Sr heterometallic coordination polymers have been reported.…”

A bimetallic cyano-bridged complex based on nickel(II) and pentacyanidonitrosylferrate(II) precursors: characterization, crystal structure, and magnetic properties

“…Cyano-bridged bimetallic complexes have been a longstanding research interest of our group [16][17][18][19][20]. In this paper, we focus on pentacyanidonitrosylferrate(II) [Fe(CN) 5 -(NO)] 2-anion considering its rich photochromic and photomagnetic properties and we report a new heterobimetallic one-dimensional polymeric complex [Ni(baepn)(l-NC)Fe(CN) 3 (NO)(l-CN)] n Á3H 2 O.…”