Selectively catalytic pastry-shape micro-crystals: A new linear metal-organic framework with [Cu(NO 3 ) 2 (bpd)(DMF)] ∝

Pastry-shaped micro-crystals of a new linear metal-organic framework (MOF), [Cu(NO 3 ) 2 (bpd) 2 (DMF)] ∝ (1Cu) (bpd=1,4-bis(4-pyridyl)-2,3-azo-1,3-butadiene), were synthesized and characterized. The crystals were monoclinic with space group P2(1)/c, a= 9.5401(8)Å, b= 14.3545(12)Å, c= 14.9823(12)Å, β =106.37(10)° and Z =4. In the title compound (1Cu), each Cu(II) center exists in a pentagonal-bipyramid environment, contributed by two N atoms from two bpds and five O atoms belonging to two nitrates and one DMF. The {Cu(NO 3 ) 2 (DMF)} moieties are bridged by bpds to form 1-D molecular chains along the ac- axis. The catalytic activity of the micro-crystals of 1Cu is high for methyl orange (90%), and lower for Orange G (55%), indicating that the catalyst synthesized in our work is not only highly active and selective for organic-dye degradation reactions, but is also very efficient.