Die Kristallstrukturen von LiCo(CO)4 und NaCo(CO)4
Abstract
The crystal structures of solvent-free crystals of two ionic tetracarbonylcobaltates are described. In LiCo(CO)4 (P[unk]3m, a = 554.2 pm, Z = 1) [Co(CO)4]−-ions are regular tetrahedral by space group symmetry. The structure is discussed as a cubic dense CO-packing with Li- and Co-atoms in tetrahedral voids. The structure of NaCo(CO)4 (Pbcm, a = 552.8, b = 1374.1, c = 920.9 pm, Z = 4) is built by distorted tetrahedral [Co(CO)4]−-and Na+-ions. The Na-atoms are coordinated by 4 O-atoms forming a distorted square, and by the Co(CO)3-moiety of a Co(CO)4-tetrahedron (dNa–co = 318.2 pm). This structure can be considered as a distorted cubic dense CO-packing with interstitial Na- and Co-atoms, intermediate between the LiCo(CO)4- and the KCo(CO)4-structure.
The shape of the [Co(CO)4]− -ion could be derived from structural data of 5 alkali-tetracarbonylcobaltates by subtracting the ionic radii of A from A –CO-lengths. A – CO-contacts are of two types: “Polar” contacts (p) C – O ··· A and “normal” contacts (n) C – O, which are ≈30pm longer.
[unk]
Coordination numbers of the alkali ions in A Co(CO)4-compounds derived from the van der Waals-shape of the anion increase from Li to Cs via an increasing number of normal contacts (Li: 4p + 0n, Na: 4p + 3n, K: 4p + 5n, Rb: 4p + 6n, Cs: 4p + 8n).
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- Crystal structure of Te(OH)6 ·2KNO3 ·2H2O: an addition compound of telluric acid
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- Generalizations of the hc notation
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- Ending the “P21/a coesite” discussion
- (Z)Bis(benzenesulfonyl)ethylene adducts to cyclopentadiene and norbornadiene
- Elastic, electrostrictive, and electro-optic properties of tetragonal sodium sulfide nonahydrate, Na2S · 9 H2O
- Elastic, electrostrictive, and electro-optic properties of orthorhombic sodium dihydrogen phosphate dihydrate, NaH2PO4 · 2H2O
- Elastic, electrostrictive, electro-optic, and nonlinear optical properties of tetragonal zinc guanidinium sulfate, Zn[C(NH2)3]2(SO4)2
- Pyroelectric, dielectric, thermal, piezoelectric, electro-optical, elastic, and thermoelastic properties of hexagonal guanidinium iodide, C(NH2)3I
Articles in the same Issue
- Referate des Fachkolloquiums „Charakterisierung von Kristallen“ und der 15. Jahrestagung der Deutschen Gesellschaft für Kristallwachstum und Kristallzüchtung 20. bis 23. März 1984 in Aachen
- Verfeinerung der Kristallstruktur von Dicadmiumgermanat Cd2GeO4
- The crystal structure of aceto-acetanilide azo-pigments IV. C.I. pigment yellow 98, α-(1-hydroxyethylidene)-acet-2-methyl-4-chloroanilido-α-azo(4′-chloro-2′-nitrobenzene)
- A single-crystal investigation of the solid solution NiB48.5 of β-rhombohedral boron type structure
- Crystal structure of Te(OH)6 ·2KNO3 ·2H2O: an addition compound of telluric acid
- Die Kristallstrukturen von KCo(CO)4 und RbCo(CO)4
- Generalizations of the hc notation
- Die Kristallstrukturen von LiCo(CO)4 und NaCo(CO)4
- Ending the “P21/a coesite” discussion
- (Z)Bis(benzenesulfonyl)ethylene adducts to cyclopentadiene and norbornadiene
- Elastic, electrostrictive, and electro-optic properties of tetragonal sodium sulfide nonahydrate, Na2S · 9 H2O
- Elastic, electrostrictive, and electro-optic properties of orthorhombic sodium dihydrogen phosphate dihydrate, NaH2PO4 · 2H2O
- Elastic, electrostrictive, electro-optic, and nonlinear optical properties of tetragonal zinc guanidinium sulfate, Zn[C(NH2)3]2(SO4)2
- Pyroelectric, dielectric, thermal, piezoelectric, electro-optical, elastic, and thermoelastic properties of hexagonal guanidinium iodide, C(NH2)3I
