Results 31 to 40 of about 1,490,657 (168)
Zhejiang Daxue xuebao. Lixue ban, 2009 以气相法二氧化硅为载体,链状胺和环胺为功能化试剂,制得一系列二氧化硅-胺基复合载体,通过配位反应得到二氧化硅负载胺-钯(II)配合物,进一步还原得到二氧化硅负载胺-钯(0)配合物.采用IR、XRD、XPS、ICP技术对配合物进行表征,并研究了配合物的制备、反应条件以及配体差异对其催化碘苯与丙烯酸的Heck反应的性能.结果表明,该类催化剂在较低的温度下(70~90 ℃)即可较好地催化该反应,生成反式产物；还原后催化剂具有更好的催化活性和良好的重复使用性能；具有链状胺基配体的催化剂随着N原子数目的增加 ...
HUGuo-hui(胡国辉) +5 more
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Zhejiang Daxue xuebao. Lixue ban, 2002 合成了三个稀土8-羟基喹啉的四元配合物,经元素分析、红外、紫外和DTA-TG等手段表征, 确定配合物的化学式为Ln(CClH2COO)2(Q)(HQ)(Ln=Ce, Pr, Nd,HQ=8-羟基喹啉).两个阴离子均配位.8-羟基喹啉同时起中性和负离子配体的作用.
HEHong-yin(何洪银) +1 more
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PLANTS, PEOPLE, PLANET, Volume 8, Issue 5, Page 1567-1571, September 2026.Dust, a common form of air pollution, is particularly problematic on roadsides, which are important habitats for plants and pollinators. We investigated whether and how road dust affects plant sexual reproduction using Primula chungensis in a biodiversity hotspot. Our study provides compelling evidence that road dust can harm plant reproductive success
Yong‐Peng Cha +4 more
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四川大学学报. 自然科学版, 2001 以均苯四甲酸根阴离子 (PMTA )为桥联配体 ,分别端接 2 ,2’ 联吡啶 (bpy) ;1,10 邻菲洛啉(phen)和 2 ,9 二甲基 1,10 邻菲洛啉 (Me2 phen) ;合成了 3种新的双核铜 (II)配合物 [Cu2 (PMTA) (bpy) 2 ](1) ,[Cu2 (PMAT) (phen) 2 ] (2 )和 [Cu2 (PMTA) (Me2 phen) 2 ] (3) .经元素分析、摩尔电导和磁性的测定以及红外光谱和电子光谱等方法对这些配合物进行了表征 .测定和解析了配合物
李延团, 焉翠蔚, 曾宪诚
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Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Epidermal bioelectronics is a transformative technology for continuous health monitoring and human‐computer interaction. However, the mechanical and physiological mismatch at the skin–device interface limits its long‐term application. Electrospun nanofiber membranes (ENMs), with their unique three‐dimensional hierarchical porous network and ...
Jiahua Ni +7 more
wiley +1 more source
New Phytologist, Volume 251, Issue 5, Page 3008-3020, September 2026.Path diagrams showing the results of piecewise structural equation models examining how fitness (total number of seeds in flowering individuals) of Cerastium fontanum depended on temperature at planting site, temperature difference, mating type, and flowering time (FFD, first flowering date) in each of the two study years.
Alicia Valdés +3 more
wiley +1 more source
安息香双Schiff碱的合成及其钴(Ⅱ)配合物的氧加合性能研究
四川大学学报. 自然科学版, 2004 制备了3种新的安息香双Schiff碱及其钴(Ⅱ)配合物.在不同温度下,测定了钴(Ⅱ)配合物氧合反应平衡常数和热力学参数ΔHo、ΔSo,讨论了氧合反应温度、配体结构对配合物二氧亲和性的影响.
李建章 +4 more
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Zhejiang Daxue xuebao. Lixue ban, 2005 选用具有双醛基的邻苯二醛与双氨基的赖氨酸缩合形成邻苯二醛缩赖氨酸席夫碱（HL），首次合成10种新的稀土氨基酸席夫碱配合物，在元素分析、热分析、紫外、可见、红外光谱及核磁共振谱等表征基础上，提出该类型配合物的组成为 LnL2(NO3) • 4H2O（Ln= La、Pr、Nd、Sm、Y）和LnL2(NO3) • 3H2O（Ln=Gd、Tb、Dy、Er、Yb),研究了它们的配位机理和谱学性质，并讨论了配合物颇具特点的可能结构.
HUMei-xian(胡美仙) +2 more
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The evolutionary origins of streptophyte multicellularity
New Phytologist, Volume 251, Issue 5, Page 2365-2383, September 2026.The phylogeny of streptophytes and the deep origin of branching filamentous growth. Summary Over their more than 1 billion years of evolutionary history, streptophytes have repeatedly transitioned between unicellular, simple multicellular and complex multicellular forms.
Tatyana Darienko +10 more
wiley +1 more source
四川大学学报. 自然科学版, 2000 研究了二氧环胺类Zn(Ⅱ )配合物对PNPP水解的影响 ,用动力学方法解析了PNPP水解的二级速率常数及二氧环胺类Zn(Ⅱ )配合物中配位水的解离常数Ka,结果表明 ,该配合物对PNPP水解反应有显著的催化作用 ,并提出了反应催化的机理 ,说明了该类配合物是一个较好的碳酸酐水解酶CA的模拟物 .
程四清, 曾宪诚, 黄忠, 余孝其
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