Chromium(II) Metal-Organic Polyhedra as Highly Porous Materials

Jinhee Park; Zachary Perry; Ying-Pin Chen; Jaeyeon Bae; Hong-Cai Zhou

doi:10.1021/acsami.7b09339

Chromium(II) Metal-Organic Polyhedra as Highly Porous Materials

ACS Appl Mater Interfaces. 2017 Aug 23;9(33):28064-28068. doi: 10.1021/acsami.7b09339. Epub 2017 Aug 10.

Authors

Jinhee Park¹, Zachary Perry², Ying-Pin Chen^{2

3}, Jaeyeon Bae¹, Hong-Cai Zhou^{2

3}

Affiliations

¹ Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science and Technology , Daegu 42988, Republic of Korea.
² Department of Chemistry, Texas A&M University , College Station, Texas 77842-3012, United States.
³ Department of Materials Science and Engineering, Texas A&M University , College Station, Texas 77840, United States.

PMID: 28741931
DOI: 10.1021/acsami.7b09339

Abstract

Herein we report for the first time the synthesis of Cr(II)-based metal-organic polyhedra (MOPs) and the characterization of their porosities. Unlike the isostructural Cu(II)- or Mo(II)-based MOPs, Cr(II)-based MOPs show unusually high gas uptakes and surface areas. The combination of comparatively robust dichromium paddlewheel units (Cr₂ units), cage symmetries, and packing motifs enable these materials to achieve Brunauer-Emmett-Teller surface areas of up to 1000 m²/g. Reducing the aggregation of the Cr(II)-based MOPs upon activation makes their pores more accessible than their Cu(II) or Mo(II) counterparts. Further comparisons of surface areas on a molar (m²/mol cage) rather than gravimetric (m²/g) basis is proposed as a rational method of comparing members of a family of related molecular materials.

Keywords: air-stable MOPs; chromium(II) paddlewheel; chromium(II) porous materials; metal−organic polyhedra (MOPs); oxygen adsorption.