Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 178, Issue 11, Pages 3342-3351Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2005.08.013
Keywords
nanoporous structures; metal organic frameworks; solvothermal synthesis; X-ray diffraction
Ask authors/readers for more resources
Two new metal organic framework (MOF) structures have been obtained from the Zn-terephthalic acid (H2BDC)-dimethyl formamide (DMF) system and examined by single-crystal X-ray diffraction: Zn(C8H4O4)(C3H7NO), 1, monoclinic C2/m, a = 11.1369(5), b = 14.0217(7), c = 7.9890(4) angstrom, beta = 106.316(1)degrees, V = 1197.3(1) angstrom(3), T = 180(2) K, Z = 4, R-1 = 0.060, wR(2) = 0.169, S = 1.27; Zn(HCO2)(3)(C2H8N), 2, trigonal R (3) over barc, a = 8.1818(1), c = 22.1235(7) angstrom, V = 1282.57(5) angstrom(3), T = 180(2) K, Z = 6, R-1 = 0.014, wR(2) = 0.039, S = 1.11. Contrary to previously published structures in the same system, the crystals were obtained by solvothermal synthesis at 381 K. Structure 1 consists of 2-D layers stacked in an offset manner to accommodate DMF moieties coordinated to Zn2+ within voids in adjacent layers. Structure 2 consists of a 3-D network constructed from Zn2+ ions bridged by deprotonated formic acid moieties. Over time, the structure of 1 rearranges to Zn(C8H4O4)(C3H7NO)(H2O) [monoclinic P2(1)/n, a = 6.6456(2), b = 15.2232(5), c = 12.6148(4) angstrom, beta = 104.110(2)degrees, V = 1237.70(7) angstrom(3), T = 100(2) K, Z = 4, R-1 = 0.048, wR(2) = 0.100, S = 1.07], which is identical to the known MOF-2 structure, obtained by crystallization at ambient conditions. The three structures were determined from crystals with similar crystal habits picked from a single solvothermal synthesis batch. The study demonstrates that MOF syntheses can give not only multiple crystal structures under different conditions, but also that numerous different structures, including some that are metastable, can be formed under identical conditions. (c) 2005 Elsevier Inc. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available