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Crystal Structure, Magnetic Properties, and Electronic Structure of Ni(NCNH2)4Cl2 and Co(NCNH2)4Cl2

✍ Scribed by Xiaohui Liu; Peter Kroll; Richard Dronskowski

Publisher: John Wiley and Sons
Year: 2001
Tongue: German
Weight: 106 KB
Volume: 627
Category: Article
ISSN: 0372-7874
DOI: 10.1002/1521-3749(200107)627:7<1682::aid-zaac1682>3.0.co;2-1

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✦ Synopsis

The crystal structures of Ni(NCNH 2 ) 4 Cl 2 and Co(NCNH 2 ) 4 Cl 2 , the first complexes with cyanamide as a neutral ligand, have been determined from single crystal data (Im3m, Z = 6, a = 1259.3(2) pm, R 1 = 0.0245 for Ni(NCNH 2 ) 4 Cl 2 and a = 1266.3(2) pm, R 1 = 0.0241 for Co(NCNH 2 ) 4 Cl 2 ; both 329 intensities and 23 parameters). Ni 2+ and Co 2+ are octahedrally coordinated by four equatorial H 2 NCN molecules and two axial chloride ions, and the 20 and 19 electron octahedral complexes are connected by a network of hydrogen bonds. The cyanamide ligands are slightly bent (166°), and the two N±C distances are 112 and 133 pm. Ni(NCNH 2 ) 4 Cl 2 /Co(NCNH 2 ) 4 Cl 2 are Curie paramagnets with two/three unpaired electrons.

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