Weak Interactions Dominating the Supramolecular Self-Assembly of a Novel Amino Acid–Based Cu(II) Coordination Polymer

Abstract

A new coordination compound [Cu(hpg)₂(H₂O)]_n (D-Hhpg = D(-)-4-hydroxyphenylglycine) has been successfully synthesized by slow evaporation of solution at room temperature and structurally characterized. Single-crystal X-ray diffraction analysis reveals that complex 1 crystallized in the monoclinic C2 space group, with cell parameters a = 36.146(4), b = 6.5383(5)), c = 6.9270(7), and β = 90.483(9). The title compound features a discrete molecular structure, which is further extended into an intricate 2D infinite supramolecular layer through numerous hydrogen bonding interactions. Finally, three types of π-π stacking interactions between two adjacent layers resulted in a 3D supramolecular architecture.

Keywords:

• D(-)-4-Hydroxyphenylglycine
• Cu(II)
• supramolecular
• weak interactions

Funding

The authors thank 973 Program of China (2011CBA00505), National Key Technology R&D Program (2012BAE06B08), the Chinese Academy of Sciences (KJCX2-YW-H30, KGCX-YW-222 and KJCX2-YW-M10) and the Science Foundation of Fujian Province (2009HZ005-1 and 2006l12005).

Supplementary Material

CCDC No 714979 (1) contains the supplementary crystallographic data for this paper. These data can be obtained free of charge via http://www.ccdc.cam.ac.uk/conts/retrieving.html, or from the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: [phone]; or e-mail: [email protected].