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Updated: Aug 23, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
Bis[tris(ethylenediamine)cobalt(III)]
Yang Peng1, Yi-Zhi Li, Song-Song Bao
1Coordination Chemistry Institute, State Key Laboratory of Coordination Chemistry, Nanjing University, 210093, People's Republic of China.
Abstract:
In the title compound, [Co(C2H8N2)3]2[Ru2(C2H4O7P2)2Cl2]Cl.3H2O, the building unit contains two crystallographically independent dinuclear [Ru2(hedp)2Cl2]5- anions, where hedp [viz. (1-hydroxyethylidene)diphosphonate] serves as a bis-chelating bridging ligand, two types of [Co(en)3]3+ cations, one uncoordinated Cl- anion and five water molecules of crystallization. The [Ru2(hedp)2Cl2]5- anions are connected to one another, forming one-dimensional chains along the a axis. The [Co(en)3]3+ cations are located between these chains and lie across inversion centres. An extensive series of hydrogen bonds lead to the formation of a three-dimensional supramolecular network structure, with channels generated along the [100] direction. The uncoordinated water molecules and Cl- anions reside in these channels.
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Structural Isomerism
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Stereoisomerism
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...

