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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 19, Number 1
BKCSDE 19(1)
January 20, 1998 

Perpendicular Interpenetration of Independent Square Grid Sheets. Synthesis and Structural Properties of [Co(NCS)2(Py2L)2]n(Py2L=trans-1,2-Bis(4-pyridyl)ethylene, 1,2-Bis(4-pyridyl)ethane)
Sung Ho Park, Kwan Mook Kim, Sang-gi Lee, Ok-Sang Jung*
Novel coordination polymers of general form [Co(NCS)2(Py2L)2]n (Py2L=trans-1,2-bis(4-pyridyl)ethylene (bpee), 1; 1,2-bis(4-pyridyl)ethane (bpea), 2) have been synthesized by slow diffusion of aqueous solution of Co(NCS)2 with ethanolic solution of appropriate spacer ligand, Py2L, in a mole ratio of 1 : 2. X-ray analyses on both 1 and 2 have provided similar unit and infinite structures with space group Ibam. The local geometry around the cobalt(Ⅱ) atoms is an octahedral arrangement with two NCS groups in trans position (N-Co-N, 180.0° (1); 180.0°(2)) and four pyridine units in propeller fashion. Each spacer ligand connects two cobalt(Ⅱ) ions defining the edges of a [Co(Ⅱ)]4 rhombus. The most fascinating feature is the occurrence of perpendicular interwoven of independent square grid sheets: this is, one molecular network is perpendicularly interpenetrated through the centers of the [Co(Ⅱ )]4 rhombuses of another independent network with all of the cobalt(Ⅱ) atoms in a coplanar sheet. The physicochemical properties of the present unique structures were studied.
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