发布求助
文献互助 智能选刊 最新文献

Science in China. Series B, Chemistry最新文献

筛选
英文 中文
单、双核钌羰基化合物Ru(CO) n ( n =5,4,3)和Ru 2 (CO) n ( n =9,8)的理论研究 单、双核钌羰基化合物Ru(CO) n ( n =5,4,3)和Ru 2 (CO) n ( n =9,8)的理论研究
Science in China. Series B, Chemistry Pub Date : 2009-11-20 DOI: 10.1360/ZB2009-39-11-1476
彭彬, 顾凤龙, 张秀辉, 罗琼, 李前树
{"title":"单、双核钌羰基化合物Ru(CO) n ( n =5,4,3)和Ru 2 (CO) n ( n =9,8)的理论研究","authors":"彭彬, 顾凤龙, 张秀辉, 罗琼, 李前树","doi":"10.1360/ZB2009-39-11-1476","DOIUrl":"https://doi.org/10.1360/ZB2009-39-11-1476","url":null,"abstract":"采用两种密度泛函方法对中性单核Ru(CO) n ( n =5,4,3)和双核Ru 2 (CO) n ( n =9,8)化合物进行理论计算,优化出16个稳定异构体. 研究发现, 和Os(CO) 5 类似, Ru(CO) 5 存在两个能量接近的最低异构体. Ru(CO) 4 的能量最低异构体为C 2 v 对称性的单态构型. Ru(CO) 3 能量最低异构体为 C s 对称性的单态构型. Ru 2 (CO) 9 的两个能量接近的最低异构体分别含有单个桥羰基和3个桥羰基. 双核不饱和Ru 2 (CO) 8 的能量最低异构体为含有两个桥羰基的单态 C 2 构型. 通过比较M 2 (CO) n (M=Fe, Ru, Os; n =9,8) 的能量最低构型, 发现Fe和 Ru倾向于形成含有多个桥配位羰基的构型, 而Os则更倾向于形成不含桥配位羰基的构型. 对离解能的研究表明, 和失去一个羰基生成Ru 2 (CO) 8 相比, Ru 2 (CO) 9 更容易离解为Ru(CO) 5 和Ru(CO) 4 .","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"7 1","pages":"1476-1483"},"PeriodicalIF":0.0,"publicationDate":"2009-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79247141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
含2,2’-联嘧啶桥Ir III -Ln III (Ln = Nd, Yb, Er)双金属配合物的合成和光物理性质 含2,2’-联嘧啶桥Ir III -Ln III (Ln = Nd, Yb, Er)双金属配合物的合成和光物理性质
Science in China. Series B, Chemistry Pub Date : 2009-11-20 DOI: 10.1360/ZB2009-39-11-1356
陈芳芳, 姜伟丽, 楼斌, 卞祖强, 黄春辉
{"title":"含2,2’-联嘧啶桥Ir III -Ln III (Ln = Nd, Yb, Er)双金属配合物的合成和光物理性质","authors":"陈芳芳, 姜伟丽, 楼斌, 卞祖强, 黄春辉","doi":"10.1360/ZB2009-39-11-1356","DOIUrl":"https://doi.org/10.1360/ZB2009-39-11-1356","url":null,"abstract":"选择具有(N^N)(N^N)位点的四齿配体2,2'-联嘧啶(bpm)作为桥联配体, 利用铱配合物Ir(dfppy) 2 (bpm)Cl作为配体与稀土配合物Ln(TTA) 3 ·2H 2 O配位, 得到了Ir III -Ln III (Ln = Nd, Yb, Er)双金属配合物[Ir(dfppy) 2 (bpm)Ln(TTA) 3 ]Cl. 通过荧光滴定的方法, 测定了该铱配合物与稀土离子之间的络合稳定常数. 通过对铱配合物及Ir III -Ln III (Ln = Nd, Yb, Er)双金属配合物在可见区光谱的测定, 可以观察到明显的铱配合物发光的猝灭,说明从铱中心到稀土中心发生了能量传递. 同时, 利用可见光选择性激发铱配合物可以获得在稀土Nd III , Yb III , Er III 离子红外区的发光. 说明了铱配合物Ir(dfppy) 2 (bpm)Cl作为配体可以较好地敏化稀土离子的红外发光.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"18 1","pages":"1356-1362"},"PeriodicalIF":0.0,"publicationDate":"2009-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84343217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
β-NaYF 4 :Yb,Er纳米晶与四甲基异氰酸罗丹明染料分子间的发光共振能量转移研究 β-NaYF 4 :Yb,Er纳米晶与四甲基异氰酸罗丹明染料分子间的发光共振能量转移研究
Science in China. Series B, Chemistry Pub Date : 2009-10-20 DOI: 10.1360/ZB2009-39-10-1153
孙聆东, 谷建勤, 张殊卓, 张亚文, 严纯华
{"title":"β-NaYF 4 :Yb,Er纳米晶与四甲基异氰酸罗丹明染料分子间的发光共振能量转移研究","authors":"孙聆东, 谷建勤, 张殊卓, 张亚文, 严纯华","doi":"10.1360/ZB2009-39-10-1153","DOIUrl":"https://doi.org/10.1360/ZB2009-39-10-1153","url":null,"abstract":"Yb 3+ 和 Er 3+ 离子掺杂的 NaYF 4 纳米晶在近红外光(980 nm)激发下可产生中心位于 539 和 655 nm 的上转换发光, 其中位于 539 nm 的发光与四甲基异氰酸罗丹明(tetrametrylrhodarnine isothiocyante, TRITC)染料分子的吸收光谱部分重叠. 本文基于上述光谱重叠特性, 构筑了以β-NaYF 4 :Yb,Er为能量给体、TRITC为能量受体的发光共振能量转移(LRET)体系. TRITC 分子通过静电作用紧密吸附于纳米晶表面, 其较近距离的相互作用利于提高 LRET 效率和体系的稳定性. 在 980 nm 近红外光激发下, LRET 过程使NaYF 4 :Yb,Er位于 539 nm的上转换发光减弱, 同时可观察到TRITC染料分子的发光. 对发光寿命的研究也证实了β-NaYF 4 :Yb,Er到TRITC的能量传递.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"16 1","pages":"1153-1158"},"PeriodicalIF":0.0,"publicationDate":"2009-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82462225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
[Ln(EDBP) 2 (DME)Na(DME) 3 ](Ln=Er, Yb, Sm)的合成、结构和引发 ε -己内酯开环聚合的研究 [Ln(EDBP) 2 (DME)Na(DME) 3 ](Ln=Er, Yb, Sm)的合成、结构和引发 ε -己内酯开环聚合的研究
Science in China. Series B, Chemistry Pub Date : 2009-10-20 DOI: 10.1360/ZB2009-39-10-1246
俞建芳, 吴光明, 黄菁, 孙维林, 沈之荃
{"title":"[Ln(EDBP) 2 (DME)Na(DME) 3 ](Ln=Er, Yb, Sm)的合成、结构和引发 ε -己内酯开环聚合的研究","authors":"俞建芳, 吴光明, 黄菁, 孙维林, 沈之荃","doi":"10.1360/ZB2009-39-10-1246","DOIUrl":"https://doi.org/10.1360/ZB2009-39-10-1246","url":null,"abstract":"通过 2,2′-亚乙基双(4,6-二叔丁基苯酚)(EDBPH2)的钠盐与硼氢化稀土Ln(BH4)3·3THF (Ln=Er, Yb, Sm)盐交换反应, 可以得到离子对形式的三种双金属配合物[Ln(EDBP)2- (DME)Na(DME)3][Ln=Er(1), Yb(2), Sm(3)]. 得到的配合物通过元素分析, FT-IR进行了表征, 并对其中的Er配合物进行了Ｘ射线单晶衍射表征, 确定了其结构. 研究结果表明, 两分子双酚配体中的四个氧原子及一个乙二醇二甲醚(DME)中的两个氧原子与稀土Er进行了配位, 而钠离子作为平衡电荷的形式存在. 配合物1~3都能作为单组分引发剂催化 e -己内酯开环聚合.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"243 2 1","pages":"1246-1250"},"PeriodicalIF":0.0,"publicationDate":"2009-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72807898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
3-羟基哌啶氮α-碳负离子的形成及α-羟烷化反应 3-羟基哌啶氮α-碳负离子的形成及α-羟烷化反应
Science in China. Series B, Chemistry Pub Date : 2009-10-20 DOI: 10.1360/ZB2009-39-10-1175
郑啸, 陈果, 阮源萍, 黄培强
{"title":"3-羟基哌啶氮α-碳负离子的形成及α-羟烷化反应","authors":"郑啸, 陈果, 阮源萍, 黄培强","doi":"10.1360/ZB2009-39-10-1175","DOIUrl":"https://doi.org/10.1360/ZB2009-39-10-1175","url":null,"abstract":"合成了( S )-3-羟基哌啶苯硫醚化合物6作为3-羟基哌啶氮α-碳负离子手性合成子(B)的合成等效体. 化合物6经羟基去质子现场保护、萘锂(LN)还原锂化形成手性哌啶醇双负离子中间体 B. 双负离子 B 可被质子淬灭得到还原产物 2a; 而与羰基化合物反应则得到α-羟烷化产物 12~17 和少量还原产物 2a. 该反应具有很高的环上2,3-位非对映立体选择性; 与非对称的羰基化合物反应产生新手性中心的立体选择性从50:50到77:23.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"42 1","pages":"1175-1183"},"PeriodicalIF":0.0,"publicationDate":"2009-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77274236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
8-羟基喹啉-5-磺酸构筑的有机-无机配位化合物的合成、结构和性质研究 8-羟基喹啉-5-磺酸构筑的有机-无机配位化合物的合成、结构和性质研究
Science in China. Series B, Chemistry Pub Date : 2009-10-20 DOI: 10.1360/ZB2009-39-10-1159
王瑛, 薛铭, 徐家宁, 朱广山, 裘式纶
{"title":"8-羟基喹啉-5-磺酸构筑的有机-无机配位化合物的合成、结构和性质研究","authors":"王瑛, 薛铭, 徐家宁, 朱广山, 裘式纶","doi":"10.1360/ZB2009-39-10-1159","DOIUrl":"https://doi.org/10.1360/ZB2009-39-10-1159","url":null,"abstract":"在溶剂热条件下, 以8-羟基喹啉-5-磺酸为配体, 合成了两个新的有机-无机配位化合物Mn(QS)(H 2 O) ( 1 ) 和 Co(QS)(H 2 O) 2 ( 2 ) (H 2 QS = 8-hydroxylquinoline-5- sulfonic acid), 并且对他们进行了单晶X-射线解析. 其中化合物 1 是一个具有金红石拓扑的三维开放骨架结构, 化合物 2 是一个三维超分子结构. 我们对这些化合物进行了粉末X射线, 红外光谱, 差热热重, 荧光光谱和磁学性质的研究.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"74 1","pages":"1159-1166"},"PeriodicalIF":0.0,"publicationDate":"2009-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88000799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
聚(吡唑)硼酸基-氨基钽化合物的合成、表征及和氧气的反应性 聚(吡唑)硼酸基-氨基钽化合物的合成、表征及和氧气的反应性
Science in China. Series B, Chemistry Pub Date : 2009-10-20 DOI: 10.1360/ZB2009-39-10-1145
陈树建 Glenn P. A. Yap 薛子陵, Glenn P. A. Yap Xue Zi-Ling Chen Shu-Jian
{"title":"聚(吡唑)硼酸基-氨基钽化合物的合成、表征及和氧气的反应性","authors":"陈树建 Glenn P. A. Yap 薛子陵, Glenn P. A. Yap Xue Zi-Ling Chen Shu-Jian","doi":"10.1360/ZB2009-39-10-1145","DOIUrl":"https://doi.org/10.1360/ZB2009-39-10-1145","url":null,"abstract":"TaCl(NMe 2 ) 4 ( 1 )与Tp*K [Tp* = 三(3,5-二甲基吡唑)硼化氢]的反应给出两个产物：第一个产物是Tp*Ta(NMe 2 ) 4 ( 2 ), 其中Tp*配体的一个N原子跟钽配位成键; 第二种产物是[Tp*Ta(NMe 2 ) 4 ]?2Tp*K ( 3 ), 其中[Tp*Ta(NMe 2 ) 4 ] ( 2a ) 的Tp*配体的三个N原子跟钽配位成键. 过量的化合物 1 加入化合物 3 中并没有跟其中的Tp*K 反应. 化合物 2 与氧气的进一步反应给出产物Tp*BH(NMe 2 ) ( 4 ). 通过类似的方法, 化合物 1 与TpK [Tp =三(吡唑)硼化氢] 的反应产出化合物TpTa(NMe 2 ) 4 ( 5 ). 研究了化合物3和5与氧气的反应. 用核磁共振, 元素分析和单晶X射线衍射对化合物 2 , 4 , 和 5 进行了表征.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"6 1","pages":"1145-1152"},"PeriodicalIF":0.0,"publicationDate":"2009-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80829353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
基于Zn(II)-甲基氮杂杯[4]吡啶复合物的氨基酸和阴离子识别 基于Zn(II)-甲基氮杂杯[4]吡啶复合物的氨基酸和阴离子识别
Science in China. Series B, Chemistry Pub Date : 2009-10-20 DOI: 10.1360/ZB2009-39-10-1194
龚汉元, 王德先, 黄志镗, 王梅祥
{"title":"基于Zn(II)-甲基氮杂杯[4]吡啶复合物的氨基酸和阴离子识别","authors":"龚汉元, 王德先, 黄志镗, 王梅祥","doi":"10.1360/ZB2009-39-10-1194","DOIUrl":"https://doi.org/10.1360/ZB2009-39-10-1194","url":null,"abstract":"甲基氮杂杯[4]吡啶(MACP-4)是具有独特构象和空腔结构的大环主体分子, 在客体存在的情况下, 它可以通过桥连氮原子的自调节作用而调节整个分子的空腔及构象, 以实现对客体最大程度的识别作用. MACP-4对Zn 2+ 具有选择性识别, 无论是在固相还是溶液中, 它都可以和Zn 2+ 形成稳定的复合物(Zn(II)-MACP-4), 结合常数可达 5.97(log K s ). 本文以 Zn(Ⅱ)-MACP-4 为主体, 研究了其与 17 种氨基酸以及具有不同几何形状的阴离子的识别行为, 结果Zn(Ⅱ)-MACP-4对17种氨基酸均具有不同程度的识别, 结合常数最高可达 3.97(log K s ), Zn(Ⅱ)-MACP-4 对阴离子的识别具有选择性, 其中对PF 6 - 的识别作用最强, 结合常数可达3.9(log K s ).","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"246 1","pages":"1194-1201"},"PeriodicalIF":0.0,"publicationDate":"2009-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76558687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
CoV 2 O 6 纳米线/微米棒的制备及其在锂离子电池中的应用 CoV 2 O 6 纳米线/微米棒的制备及其在锂离子电池中的应用
Science in China. Series B, Chemistry Pub Date : 2009-09-20 DOI: 10.1360/ZB2009-39-9-918
陈军 马华冀伟强杨晓婧陶占良, Ji Wei-Jiang Yang Xiao-Jing Dao Tie-Liang Chen Jun Ma Hua
{"title":"CoV 2 O 6 纳米线/微米棒的制备及其在锂离子电池中的应用","authors":"陈军 马华冀伟强杨晓婧陶占良, Ji Wei-Jiang Yang Xiao-Jing Dao Tie-Liang Chen Jun Ma Hua","doi":"10.1360/ZB2009-39-9-918","DOIUrl":"https://doi.org/10.1360/ZB2009-39-9-918","url":null,"abstract":"采用水热法制备了纳米线/微米棒结构的CoV 2 O 6 电极材料, 并探讨了纳米线/微米棒的形成机理. 通过XRD、BET、SEM、TEM/HRTEM等测试手段对合成产物的结构、形貌、组成、表面性质进行了表征, 结果表明, 水热条件例如反应温度、反应时间对于产物的结构和形貌起关键作用. 在220℃, 水热反应1 h可以得到直径为60 nm的CoV 2 O 6 纳米线, 而在220℃, 水热反应6 h可以得到直径10 μm的CoV 2 O 6 微米棒. 研究了CoV 2 O 6 纳米线/微米棒作为锂离子电池负极材料的电化学性能, 结果显示, 与CoV 2 O 6 微米棒相比, CoV 2 O 6 纳米线具有高的初始放电容量(1235 mAh/g)和较好的循环稳定性, CoV 2 O 6 纳米线有希望作为锂离子电池的负极材料.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"296 1","pages":"918-925"},"PeriodicalIF":0.0,"publicationDate":"2009-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73162897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
4-PEG接枝苯乙烯-马来酸酐交替共聚物的合成及功能化 4-PEG接枝苯乙烯-马来酸酐交替共聚物的合成及功能化
Science in China. Series B, Chemistry Pub Date : 2009-09-20 DOI: 10.1360/ZB2009-39-9-950
任丽霞, 陈永明
{"title":"4-PEG接枝苯乙烯-马来酸酐交替共聚物的合成及功能化","authors":"任丽霞, 陈永明","doi":"10.1360/ZB2009-39-9-950","DOIUrl":"https://doi.org/10.1360/ZB2009-39-9-950","url":null,"abstract":"采用普通自由基聚合和可逆加成-断裂链转移(RAFT)自由基聚合方法合成了对位PEG取代苯乙烯(PEG- g -St)和马来酸酐的交替共聚物(P((PEG-g-St)- alt -MA)), 13C NMR分析表明PEG-g-St和马来酸酐单元采取交替的序列结构. 利用反应性基团- 马来酸酐单元的水解以及胺解可以制备功能性的PEG聚合物. 以月桂胺为模型小分子研究了该聚合物的胺解, 得到4-PEG-苯乙烯与羧酸基团以及疏水烷烃的交替序列聚合物, 该双亲聚合物在水溶液中形成组装体.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"688 1","pages":"950-958"},"PeriodicalIF":0.0,"publicationDate":"2009-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77002113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信