目前,我国正处于国家公园体制稳步推进,自然保护地体系转型重构的关键时期,明确国家公园的发展思路与理念是我们亟待解决的关键问题。National Parks:The American Experience一书较为全面地探讨了美国国家公园体系的发展历程及发展理...目前,我国正处于国家公园体制稳步推进,自然保护地体系转型重构的关键时期,明确国家公园的发展思路与理念是我们亟待解决的关键问题。National Parks:The American Experience一书较为全面地探讨了美国国家公园体系的发展历程及发展理念变迁,讲述了联邦政府、铁路公司和环保组织等利益团体围绕"国家公园该如何发展"这条主线展开的一系列博弈过程,涵盖了重要的历史事件、关键的推动性人物及相关开创性法案等内容。书中对推动美国国家公园发展的思潮和理念做了总结回顾,尤其是国家公园应该"保护什么"以及"如何保护"的思考,对完善我国国家公园体制、重构自然保护地体系具有一定的借鉴和启示意义。展开更多
Precise control over metal-organic polyhedra(MOPs)architectures via metal and organic linker engineering presents a critical challenge for advancing functional porous materials with specific properties.The rational de...Precise control over metal-organic polyhedra(MOPs)architectures via metal and organic linker engineering presents a critical challenge for advancing functional porous materials with specific properties.The rational design of organic linkers and secondary building units(SBUs)with programmable configurational features facilitates the assembly of novel MOPs,wherein structural complexity is enhanced through the integration of low-symmetry linkers and expandable SBUs.Herein,a series of polyoxovanadatebased metal-organic polyhedra(VMOPs)with modulated structures were systematically engineered through linker desymmetrization and SBU expansion approach.Two types of tritopic triazine(D_(3h))-or imidazole(C_(s)/C_(1))-functionalized carboxylate ligands assemble with 3-connected prototype{V_(6)S}or expansional{V_(6)P}clusters,yielding VMOPs that exhibit structural evolution from T_(d)-symmetric regular tetrahedrons to D_(2d)-symmetric isosceles variants.Expansion of vertex clusters leads to structural fine-tuning of VMOPs,giving rise to diverse ligand conformations.Interestingly,these VMOPs exhibit significant differences during the iodine adsorption in both n-hexane solution and gaseous phases,which can be explained by the comprehensive influence of their cavity volume,the functional groups included,and the stacking arrangement.These findings demonstrate an effective structure-designing strategy via regulation of ligand symmetry and SBU architectural features,providing a powerful approach for the customized synthesis of MOPs with tailored structures and functionalities.展开更多
文摘目前,我国正处于国家公园体制稳步推进,自然保护地体系转型重构的关键时期,明确国家公园的发展思路与理念是我们亟待解决的关键问题。National Parks:The American Experience一书较为全面地探讨了美国国家公园体系的发展历程及发展理念变迁,讲述了联邦政府、铁路公司和环保组织等利益团体围绕"国家公园该如何发展"这条主线展开的一系列博弈过程,涵盖了重要的历史事件、关键的推动性人物及相关开创性法案等内容。书中对推动美国国家公园发展的思潮和理念做了总结回顾,尤其是国家公园应该"保护什么"以及"如何保护"的思考,对完善我国国家公园体制、重构自然保护地体系具有一定的借鉴和启示意义。
基金financially supported by the Guangdong Basic and Applied Basic Research Foundation(No.2025A1515010370)Science and Technology Innovation Program of Hunan Province(No.2022RC1115).
文摘Precise control over metal-organic polyhedra(MOPs)architectures via metal and organic linker engineering presents a critical challenge for advancing functional porous materials with specific properties.The rational design of organic linkers and secondary building units(SBUs)with programmable configurational features facilitates the assembly of novel MOPs,wherein structural complexity is enhanced through the integration of low-symmetry linkers and expandable SBUs.Herein,a series of polyoxovanadatebased metal-organic polyhedra(VMOPs)with modulated structures were systematically engineered through linker desymmetrization and SBU expansion approach.Two types of tritopic triazine(D_(3h))-or imidazole(C_(s)/C_(1))-functionalized carboxylate ligands assemble with 3-connected prototype{V_(6)S}or expansional{V_(6)P}clusters,yielding VMOPs that exhibit structural evolution from T_(d)-symmetric regular tetrahedrons to D_(2d)-symmetric isosceles variants.Expansion of vertex clusters leads to structural fine-tuning of VMOPs,giving rise to diverse ligand conformations.Interestingly,these VMOPs exhibit significant differences during the iodine adsorption in both n-hexane solution and gaseous phases,which can be explained by the comprehensive influence of their cavity volume,the functional groups included,and the stacking arrangement.These findings demonstrate an effective structure-designing strategy via regulation of ligand symmetry and SBU architectural features,providing a powerful approach for the customized synthesis of MOPs with tailored structures and functionalities.
