Micro- and nano- rods and plates of three porous Zn(II)-based metal-organic frameworks, [Zn2(oba)2(4-bpdb)]n·2(DMF) (TMU-4), [Zn(oba)(4-bpdh)0.5]n·1.5(DMF) (TMU-5) and [Zn(oba)(4-bpmb)0.5]n 1.5(DMF) (TMU-6) were synthesized by coordination modulation method. The effects of concentration of modulator, temperature and time of reaction on size and morphology have been investigated. Also catalytic performance of TMU-5 nano sized metal-organic framework in Knoevenagel condensation reaction was evaluated.