Synthesis and structure of a one- and a three-dimensional material constructed from molybdenum phosphates and macrocyclic metal complexes

Abstract

Two new polyoxometalate-based materials, [CuL]₂[H₂Mo₅P₂O₂₃]·2H₂O·2CH₃CN (1) and [NiL]₂[H₂Mo₅P₂O₂₃]·10H₂O (2) (L = 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraaza-cyclotetradecane), have been isolated from the reactions of [CuL](ClO₄)₂ and [NiL](ClO₄)₂ with (NH₄)₆Mo₇O₂₄, respectively, and structurally characterized. Single-crystal X-ray diffraction analysis of 1 showed that clusters of [H₂Mo₅P₂O₂₃]⁴⁻ bridge [CuL]²⁺ to form 1-D chains, with O–HO and N–HO hydrogen bonding interactions forming a 3-D framework. The structure of 2 showed a 3-D network structure constructed from [H₂Mo₅P₂O₂₃]⁴⁻ clusters bridging [NiL]²⁺, generating 1-D channels occupied by guest water molecules.

Keywords:

• Macrocyclic metal complex
• Molybdenum phosphate
• Crystal structure

Acknowledgments

This work was financially supported by the Science and Technology Planning Project of Hunan Province (2012FJ3050, 2012NK3067), the Construct Program of the Key Discipline in Hunan Province (2011-76), the Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province (2012-318), NSF of Hunan (11JJ2009), and Hunan University of Science and Engineering.