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Abstract: A novel 2D 4·82 CdII network with alternating heterochiral motif was reported, which is extended to 3D through π–π stacking. Interestingly, 1D hydrophilic tunnel of 3D architecture, providing potential helical hydrogen-bonded identification sites, acts as a template for the formation of the alternate left- and right-handed 1D helical water chains. The compound exhibits intense photoluminescence at room temperature. [Copyright &y& Elsevier]

Abstract: The first coordination polymer with two distinct two-dimensional layers has been synthesized and characterized [(H2O)Cu(IN)2(BPY)Cu(IN)2] 1 (IN=isonicotinate; BPY=4, 4′-bipyridine). The entire length of the BPY molecule with “free” nitrogen cap in Cu1 layer penetrates through the parallel neighboring Cu2 layer, with half of the BPY shown above the penetrated Cu2 layer, forming a male–female paired layer network. [Copyright &y& Elsevier]

A new oxo-centered, carboxylate bridged trinuclear mixed-valence iron coordination polymer has been obtained under hydrothermal conditions, [(Fe III ) 2 Fe II ( μ 3 -O)(BNA) 6 ] n ( 1 ). Single crystal X-ray diffraction analysis of the black crystal reveals that three iron atoms occupy the vertices of a non-equilateral triangle with the Fe┄Fe distance in the range of 3.245 Å–3.343 Å and are bonded by the μ 3 -oxo-centered and BNA − ligands. The crystal belongs to the monoclinic crystal system with a  = 11.2904(6) Å, b  = 18.4960(11) Å, c  = 21.4349(12) Å, β  = 91.029(1), space group P 2 1 / c , GOF  = 1.028, final R 1  = 0.0156, w R 2 [ I  > 2 σ (I)] = 0.0405. [ABSTRACT FROM AUTHOR]

Decomposition mechanism of PbSe particles in water is proposed, which convert into Se single crystal nanowires and PbSeO 3 /Pd 3 (CO 3) 2 (OH) 2 sheets growing on the surface of undissolved PbSe particles by reacting with O 2 and CO 2 in water. • Mechanisms of nucleation and growth on particle surface in solution. • Decomposition of PbSe in water. • Understanding and controlling materials stability and thus the device design. PbSe materials are widely researched and utilized in visible-infrared photodetectors, displays, transistors, thermoelectric devices, and photovoltaics. However, the instability of PbSe limits practical utilization. Understanding the decomposition mechanisms of PbSe enables the guiding of targeted design to improve its stability. Here, we studied the decomposition process of PbSe in water, which is exposed to air, by using ex-situ and semi in situ transmission electron microscope (TEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and electron tomography reconstruction (ETR). We found that, besides water molecules, PbSe particles also react with O 2 and CO 2 that are adsorbed in water from the air. Pd 3 (CO 3) 2 (OH) 2 , PbSeO 3 , and Se nucleate and grow on the surface of PbSe powders. This work provides an understanding of the mechanism of materials nucleation, growth, and decomposition. Furthermore, the findings can be potentially used as a reference to improve the stability and lifetime of PbSe devices. [ABSTRACT FROM AUTHOR]