To systematically investigate the factors that influence the formation of various metal(II) complexes, dual systems containing a flexible benzene dicarboxylate and two kinds of dipyridyl-type coligands are assembled into six metal(II) complexes, formulated as {[Zn(phda)(bpa)]·(H2O)3} n (1), {[Zn2(phda)2(dpe)2]·(H2O)} n (2), [Co(phda)(bpa)(H2O] n (3), [Co(phda)(dpe)] n (4), [Mn(phda)(bpa)(H2O)] n (5), and [Mn(phda)(dpe)0.5(H2O)] n (6) (phda = 1,2-phenylenediacetate, dpe = 1,2-di(4-pyridyl)ethylene, and bpa = 1,2-bi(4-pyridyl)ethane). The X-ray single crystal diffractions show that the formed six complexes reveal a diversified structure topology under the regulation of two kinds of dipyridyl-type coligands and are further divided into three complex pairs based on the nature of metal cations. Each pair of complexes is assembled from the same metal cation and different dipyridyl-type coligands to produce disparate structures respectively: the three-dimensional (3D) metal–organic frameworks of zinc complex pairs (1, 2) feature a single dia net with permanent porosity when the free solvent molecules are evacuated and a 4-fold interpenetrated dia net with dense structure, respectively; cobalt complexes pairs (3, 4) exhibit a two-dimensional (4,4) grid and a 3D self-penetrated framework with (48668) rob net, respectively. Both manganese complex pairs (5, 6) display (4,4) grids except that the former contains linear metal carboxylates and the latter consists of ribbonlike metal carboxylates. In addition, thermal stability of complex 1, luminescent properties of the zinc complex pairs (1, 2), and magnetic properties of complexes 4 and 6 are also systematically investigated.

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Environmental regulation is a crucial way to achieve manufacturing green transformation. However, few studies have explored the spatial spillover effects and regional boundaries of environmental regulation on manufacturing carbon emissions from the perspective of local government competition. Based on the manufacturing panel data of 30 provinces in China from 2007 to 2019, this paper uses the spatial Durbin model to examine the impact mechanisms, spatial spillover effects, regional boundaries and industry heterogeneity of environmental regulation, and local government competition on manufacturing carbon emissions. The results show that (1) environmental regulation suppresses local manufacturing carbon emissions, local government competition increases local manufacturing carbon emissions, but the interaction indicates that local governments tend to top-to-top competition under the constraints of environmental regulation. (2) The spatial spillover effect of environmental regulation has regional boundaries. The regional boundary with a positive spillover effect is 600 km, and the regional boundary with a negative spillover effect is 1600 km. (3) Environmental regulation and local government competition have spatial heterogeneity in the carbon reduction effects of seven-type manufacturing industries. These findings suggest concrete evidence for developing policies for further encouraging green development in manufacturing.

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