Syntheses, crystal structures and thermal properties of 3D coordination polymers assembled from 1,4,5,8-naphthalenetetracarboxylic acid

摘要

Two new coordination polymers based on 1,4,5,8-naphthalenetetracarboxylate (ntc) has been prepared by hydrothermal methods. Their crystal structures have been determined from synchrotron powder X-ray diffraction data. Ca-2(Cl4H4O8)(H2O)(2), CPO-13, is built around infinite chains kof seven coordinated calcium atoms. Zn-2(C14H4O8)(H2O)(2), CPO-14, is isostructural with Mn-2(C14H4O8)(H2O)(2), and is built around infinite chains of corner sharing Zn octahedra. Crystal data for CPO-13: Triclinic space group P-1, with a = 5.820, b = 6.759, c = 10.168 angstrom, alpha = 72.32 degrees, beta = 86.09 degrees, gamma = 107.74 degrees, V = 357.310 angstrom(3) and Z = 1. Crystal data for CPO-14: Orthorhombic space group Pbam, with a = 9.773, b = 7.060, c = 9.879 angstrom, V = 681.729 angstrom(3) and Z = 2. The thermal properties were investigated for both compounds. An unusual anisotropic thermal expansion for CPO-14 is caused by the carboxylate groups of the me anions gradually bending away from each other. (c) 2006 Elsevier Masson SAS. All rights reserved.