title: Triaqua-1κO-μ-cyanido-1:2κN:C-penta-cyanido-2κC-tetra-kis-(dimethyl-formamide-1κO)-1-holmium(III)-2-iron(III) monohydrate.
abstract: In the bimetallic cyanide-bridged title complex, [Fe(0.98)HoRu(0.02)(CN)(6)(C(3)H(7)NO)(4)(H(2)O)(3)]·H(2)O, the Ho(III) ion is in a slightly distorted square-anti-prismatic arrangement formed by seven O atoms from four dimethyl-formamide (DMF) mol-ecules and three water mol-ecules, and one N atom from a bridging cyanide group connected with the Fe(III) atom which is octa-hedrally coordinated by six cyanide groups. In the crystal, mol-ecules are held together through O-H⋯N and O-H⋯O hydrogen-bonding inter-actions to form a three-dimensional framework. Elemental analysis of one of the precursors and the crystal shows that there is a slight contamination of Fe by Ru. The Fe site displays, therefore, small substitutional disorder with site-occupancy factors Fe/Ru = 0.98:0.02. The two methyl groups of two dimethyl-formamide ligands are positionally disordered with site-occupancy factors of 0.44 (3):0.56 (3) and 0.44 (3):0.56 (3).
authors.affiliation: Yunnan University, Department of Chemistry, Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Kunming 650091,  People's Republic of China .
authors.forename: Hong-Fang
authors.initials: HF
authors.lastname: Li
authors.forename: Qi-Hua
authors.initials: QH
authors.lastname: Zhao
authors.forename: Ming-Jin
authors.initials: MJ
authors.lastname: Xie
authors.forename: Fan
authors.initials: F
authors.lastname: Yang
references.citation: J Am Chem Soc. 2003 Oct 15;125(41):12396-7
references.pmid: 14531668
references.citation: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references.pmid: 18156677