Crystal structure of layered bis(ethylenediamine)nickel hexavanadate as a new representative of the V₆O₁₄ series

Abstract

A new [Ni(NH(2)CH(2)CH(2)NH(2))(2)](V(6)O(14)) compound has been synthesized hydrothermally and was found to crystallize in the monoclinic system. The single-crystal X-ray data leads to a disordered structure, which can be decomposed into two ordered models with different stacking of the V(6)O(14) layers. The structure of the layer is the same in both models and represents a new member of the V(6)O(14) series. All known structures from this series are constructed from the same chain of square pyramids (SP), which share alternatively adjacent or opposite edges of their bases. The differences lie in the orientation of the SP chains which are joined together by sharing corners with tetrahedra to form the layers. Combinatorial analysis of the V(6)O(14) structures was conducted, yielding ten possible symmetry groups for the series of V(6)O(14) layers. The known structures belong only to the three simplest cases with the highest symmetry.

Synthesis, Structure, and Sensor Properties of Vanadium Pentoxide Nanorods

“…The presence of acetic acid in the matrix solution decreases the pH to 2–3, which is close to the electroneutrality of hydrolyzed vanadia species. According to ref 26. an acidic medium produces vanadia frameworks built from layers of square pyramids or distorted octahedra.…”

Structural chemistry of vanadium oxides with open frameworks

“…It is noteworthy that only the and orientation of the chains can form step-like layers denoted as H and H . Detailed topographical analysis and deduction of all possible Z-T layers is given by Zavalij et al (1999). Thus, recently synthesized compounds represent ®ve out of six simplest structures and only the layer has not yet been found.…”

“…(1) Zavalij et al (1997a); (2) Nazar et al (1996); (3) Zhang et al (1996b); (4) Zhang, DeBord et al (1996); (5) Chen et al (1999); (6) Zavalij et al (1999). example of single-chain structures with the VO 3 composition.…”

“…Riou & Fe  rey (1995) and Zhang et al (1996a) described a structure of V 2 O 5 layers built with pairs of square pyramids and tetrahedra. Zavalij et al (1999) gave topographical analysis and combinatorial deduction of the simplest structures for V 6 O 14 layers constructed with zigzag chains of edge-sharing square pyramids and tetrahedra. Galy (1992) gave a general review of vanadium oxide phases with single and double M x V 2 O 5 layers.…”

Synthesis and Molecular Structure of Bis(ethylenediamine)acetatonickel(II)hexafluoridophosphate Complex [Ni(en)2(CH3CO2)]PF6. An Unexpected Acetylacetonato Cleavage Reaction

“…Bauer reported on the bis(ethylenediamine)nickel(II) dinitrate, where there is a very long Ni–O(nitrate) bond length 3 . Zavalij discovered the V 6 O 10 layered material bis(ethylenediamine)nickel(II)hexavanadate 4 . Cervantes observed the trans coordination of unsubstituted cytosine in bis(cytosine‐O 2 )bis(ethylenediamine)nickel(II) bis(tetraphenylborate) 5 .…”