Unique coordination of pyrazine in T[Ni(CN){sub 4}].2pyz with T=Mn, Zn, Cd

Journal Article · Wed Apr 15 00:00:00 EDT 2009 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2008.12.028· OSTI ID:21370336

Lemus-Santana, A A ^[1]; Rodriguez-Hernandez, J ^[2]; Castillo, L.F. del, ^[1]; Basterrechea, M ^[2]; Reguera, E ^[2]

---

1. Departamento de Polimeros, Instituto de Investigaciones en Materiales, Universidad Nacional Autonoma de Mexico (Mexico)
2. Instituto de Ciencia y Tecnologia de Materiales, Universidad de La Habana, La Ciudad de La Habana (Cuba)

The materials under study, T[Ni(CN){sub 4}].2pyz with T=Mn, Zn, Cd, were prepared by separation of T[Ni(CN){sub 4}] layers in citrate aqueous solution to allow the intercalation of the pyrazine molecules. The obtained solids were characterized from chemical analyses, X-ray diffraction, infrared, Raman, thermogravimetry, UV-Vis, magnetic and adsorption data. Their crystal structure was solved from ab initio using direct methods and then refined by the Rietveld method. A unique coordination for pyrazine to metal centers at neighboring layers was observed. The pyrazine molecule is found forming a bridge between Ni and T atoms, quite different from the proposed structures for T=Fe, Ni where it remains coordinated to two T atoms to form a vertical pillar between neighboring layers. The coordination of pyrazine to both Ni and T atoms minimizes the material free volume and leads to form a hydrophobic framework. On heating the solids remain stable up to 140 deg. C. No CO{sub 2} and H{sub 2} adsorption was observed in the small free spaces of their frameworks. - Graphical abstract: Framework for T[Ni(CN){sub 4}].2pyz with T=Mn, Zn, Cd.

• OSTI ID: 21370336
• Journal Information: Journal of Solid State Chemistry, Vol. 182, Issue 4; Other Information: DOI: 10.1016/j.jssc.2008.12.028; PII: S0022-4596(08)00654-3; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AQUEOUS SOLUTIONS
CADMIUM COMPLEXES
CLATHRATES
CRYSTAL STRUCTURE
HEATING
MANGANESE COMPLEXES
NICKEL COMPLEXES
PYRAZINES
TEMPERATURE RANGE 0273-0400 K
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION
ZINC COMPLEXES
AZINES
CHEMICAL ANALYSIS
COHERENT SCATTERING
COMPLEXES
DIFFRACTION
DISPERSIONS
GRAVIMETRIC ANALYSIS
HETEROCYCLIC COMPOUNDS
HOMOGENEOUS MIXTURES
MIXTURES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
SCATTERING
SOLUTIONS
TEMPERATURE RANGE
THERMAL ANALYSIS
TRANSITION ELEMENT COMPLEXES