Tuning Cobalt Coordination\nArchitectures by Bis(1,2,4-triazol-1-ylmethyl)benzene\nPosition Isomers and 5-Nitroisophthalate

Abstract

In our effect to tune the Co­(II) coordination polymer\narchitectures,\nthree position isomers 1,2-, 1,3-, 1,4-bis­(1,2,4-triazol-1-ylmethyl)­benzene\nand rigid 5-nitroisophthalate were used to assembly Co­(II) coordination\npolymers [Co­(obtz)­(NO₂-1,3-bdc)]_<i>n</i> (<b>1</b>), [Co­(mbtz)­(NO₂-1,3-bdc)­(CH₃OH)]_<i>n</i> (<b>2</b>), and [Co­(bbtz)­(NO₂-1,3-bdc)­(H₂O)]_<i>n</i> (<b>3</b>). <b>1</b> is comprised of undulated two-dimensional\n(2D) (4,4) networks. Two identical undulated layers are parallel interpenetrated\nto each other to give a (2D → 2D) polycatenated 2D network.\nThe adjacent polycatenated 2D layers parallel polythreaded to form\na unique 3D network. <b>1</b> is an unusual 2D → 3D polythreaded\nframework based on the polycatenated 2D layers. <b>2</b> shows\nthe double-layer structure through the hydrogen bonds and π···π\nstacking interactions based on the undulated 2D (4,4) network. A 3D\nsupramolecular network is constructed through the π···π\nstacking interactions interdouble layers. <b>3</b> exhibits\na 3-fold interpenetrating 4-connected 6⁵·8-CdSO₄ 3D network. The powder X-ray diffraction, thermal stabilities,\nand UV–vis spectroscopy of <b>1</b>, <b>2</b>,\nand <b>3</b> were investigated.