Controlling Thermal Expansion Behaviors of Fence-Like Metal-Organic Frameworks by Varying/Mixing Metal Ions.

ABSTRACT: Solvothermal reactions of 3-(4-pyridyl)-benzoic acid (Hpba) with a series of transition metal ions yielded isostructral metal-organic frameworks [M(pba)₂]·2DMA (MCF-52; M = Ni²⁺, Co²⁺, Zn²⁺, Cd²⁺, or mixed Zn²⁺/Cd²⁺; DMA = N,N-dimethylacetamide) possessing two-dimensional fence-like coordination networks based on mononuclear 4-connected metal nodes and 2-connected organic ligands. Variable-temperature single-crystal X-ray diffraction studies of these materials revealed huge positive and negative thermal expansions with |α| > 150 × 10^-6 K^-1, in which the larger metal ions give the larger thermal expansion coefficients, because the increased space not only enhance the ligand vibra

SUBMITTER: Zhou HL 

PROVIDER: S-EPMC6066979 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature