New directions in earth system governance research

The Earth System Governance project is a global research alliance that explores novel, effective governance mechanisms to cope with the current transitions in the biogeochemical systems of the planet. A decade after its inception, this article offers an overview of the project's new research framework (which is built upon a review of existing earth system governance research), the goal of which is to continue to stimulate a pluralistic, vibrant and relevant research community. This framework is composed of contextual conditions (transformations, inequality, Anthropocene and diversity), which capture what is being observed empirically, and five sets of research lenses (architecture and agency, democracy and power, justice and allocation, anticipation and imagination, and adaptiveness and reflexivity). Ultimately the goal is to guide and inspire the systematic study of how societies prepare for accelerated climate change and wider earth system change, as well as policy responses

Identifying Selective Host-Guest Interactions Based on Hydrogen Bond Donor-Acceptor Pattern in Functionalized Al-MIL-53 Metal-Organic Frameworks

We present a study analyzing the selectivity of host guest interactions in a series of functionalized Al-MIL-53-X metal organic frameworks with X = H, NH2, and NHCHO using acetone; ethanol, and water as probe molecules. While the amino group introduces additional hydrogen bond donor centers the NHCHO anchors function as donor and acceptor. The guests were chosen due to their ability to act solely as an acceptor in the case of acetone, whereas ethanol and water provide acceptor and donor qualities with a gradual decrease of the acceptor strength toward ethanol. The characterization of the host guest interactions includes a comprehensive solid-state NMR spectroscopic study based on a full assignment of H-1 and C-13 high-resolution spectra using CRAMPS decoupling schemes to enhance H-1 resolution combined with advanced 2D HETCOR (H-1-C-13, H-1-Al-27, and H-1-N-14) spectra at high magnetic fields. In spite of a pronounced dynamical disorder of the guests, we could identify a preferred binding of the acetone via a NH center dot center dot center dot OC hydrogen bond for the NH2 and the NHCHO anchor groups by analyzing trends in the C-13 isotropic chemical shifts. At the same time H-1-H-1 through space connectivities reveal a close vicinity of the acetone methyl groups to the benzene rings of the linkers. In contrast, for ethanol and water, the interaction with the anchor groups is too weak to compete with the thermal disorder at room temperature