The organic-inorganic hybrid polymer [Mn（mbbimb）2（1,5-nds）]n 1 has been synthesized using 1,5-naphthalenedisulfonate （1,5-nds） and 1,3-bis（benzimidazol-1-ylmethyl）- 2,4,structure analysis indicates that 1 crys...The organic-inorganic hybrid polymer [Mn（mbbimb）2（1,5-nds）]n 1 has been synthesized using 1,5-naphthalenedisulfonate （1,5-nds） and 1,3-bis（benzimidazol-1-ylmethyl）- 2,4,structure analysis indicates that 1 crystallizes in monoclinic, space group C2/c with a=21.3546（17）, b=11.8841（7）, c=22.1588（16）A, β=108.058（3）°, C60H54MnN8O6S2, Mr=1102.17, Z=4, V=5346.5（7）A^3, Dc=1.369 g/cm^3, μ=0.386 mm^-1, F（000）=2300, S=1.091, R=0.0634 and wR=0.1559 for 4641 observed reflections （I 〉 2σ（I））. The Mn center is six-coordinated to furnish a distorted octahedral geometry, and the overall framework is a 6-connected 3D net.展开更多
Chemical reaction possibility was described quantitatively for the case of nitrotriazolam preparation with 2-clonazepam by using the data of two quantum chemical reactivity indices: net electrophilicity index and Wibe...Chemical reaction possibility was described quantitatively for the case of nitrotriazolam preparation with 2-clonazepam by using the data of two quantum chemical reactivity indices: net electrophilicity index and Wiberg bond order. Furthennore, relevant reaction mechanism was derived from tlie aspect of quantum chemistry. The results show that the indices used can quantitatively explain the chemical reactivity and reaction mechanism of the nitrotriazolam preparation. To validate the universal applicability of the proposed approach, the authors continued to use the quantum chemical reactivity indices to describe some classic chemical reactions, expecting to predict major issues related to physical organic chemistry, such as new chemical reactions and their mechanisms.展开更多
A recent and potentially profound innovation is the creation of cryptocurrencies and the underlying technology that is essential for their use in various financial transactions.Given the anonymity of a user of a crypt...A recent and potentially profound innovation is the creation of cryptocurrencies and the underlying technology that is essential for their use in various financial transactions.Given the anonymity of a user of a cryptocurrency,such digital currencies may be used for many different types of both lawful and illicit activities.The main purpose of this paper is to examine the extent to which ethical considerations associated with the use of cryptocurrencies affect the valuations attached to such currencies.The examination is based on a text analytic approach that involves measuring the extent to which ethical and unethical words are used in a discussion related to Bitcoin on Twitter to determine if there is a connection between ethics and cryptocurrency valuations.We find the frequency of an unethical discussion about Bitcoin is negatively associated with its price.In contrast,the frequency of an ethical discussion is positively associated with its price.展开更多
变质程度达角闪岩相及麻粒岩相的各类变质岩石在变质作用高峰期后,如果降温速率比较慢,往往发生退变质性质的离子再交换反应与纯转换反应。这两类退变质反应不可避免地改造了变质高峰期的矿物成分,使岩石不能准确记录变质作用各阶段的...变质程度达角闪岩相及麻粒岩相的各类变质岩石在变质作用高峰期后,如果降温速率比较慢,往往发生退变质性质的离子再交换反应与纯转换反应。这两类退变质反应不可避免地改造了变质高峰期的矿物成分,使岩石不能准确记录变质作用各阶段的矿物成分和变质作用p T轨迹。对这两类反应的研究已成为近年来变质岩石学研究的热点之一。本文通过研究实例,简要综述了基性麻粒岩中石榴子石-斜方辉石之间的Fe-Mg再交换反应、酸性麻粒岩中斜长石-碱性长石之间的K-Na再交换反应、泥质片麻岩中石榴子石变斑晶边部的部分分解(纯转换)反应,以及恢复变质高峰期矿物成分和计算变质高峰期p T条件的方法。指出只有在准确恢复变质高峰期变质矿物成分的基础上,获得的变质作用p T t轨迹才能反映客观地质事实。展开更多
基金This work was supported by the State Key Laboratory of Structural Chemistry, the Ministry of Science and Technology of China (001CB108906)the National Natural Science Foundation of China (20333070)
文摘The organic-inorganic hybrid polymer [Mn（mbbimb）2（1,5-nds）]n 1 has been synthesized using 1,5-naphthalenedisulfonate （1,5-nds） and 1,3-bis（benzimidazol-1-ylmethyl）- 2,4,structure analysis indicates that 1 crystallizes in monoclinic, space group C2/c with a=21.3546（17）, b=11.8841（7）, c=22.1588（16）A, β=108.058（3）°, C60H54MnN8O6S2, Mr=1102.17, Z=4, V=5346.5（7）A^3, Dc=1.369 g/cm^3, μ=0.386 mm^-1, F（000）=2300, S=1.091, R=0.0634 and wR=0.1559 for 4641 observed reflections （I 〉 2σ（I））. The Mn center is six-coordinated to furnish a distorted octahedral geometry, and the overall framework is a 6-connected 3D net.
文摘Chemical reaction possibility was described quantitatively for the case of nitrotriazolam preparation with 2-clonazepam by using the data of two quantum chemical reactivity indices: net electrophilicity index and Wiberg bond order. Furthennore, relevant reaction mechanism was derived from tlie aspect of quantum chemistry. The results show that the indices used can quantitatively explain the chemical reactivity and reaction mechanism of the nitrotriazolam preparation. To validate the universal applicability of the proposed approach, the authors continued to use the quantum chemical reactivity indices to describe some classic chemical reactions, expecting to predict major issues related to physical organic chemistry, such as new chemical reactions and their mechanisms.
文摘A recent and potentially profound innovation is the creation of cryptocurrencies and the underlying technology that is essential for their use in various financial transactions.Given the anonymity of a user of a cryptocurrency,such digital currencies may be used for many different types of both lawful and illicit activities.The main purpose of this paper is to examine the extent to which ethical considerations associated with the use of cryptocurrencies affect the valuations attached to such currencies.The examination is based on a text analytic approach that involves measuring the extent to which ethical and unethical words are used in a discussion related to Bitcoin on Twitter to determine if there is a connection between ethics and cryptocurrency valuations.We find the frequency of an unethical discussion about Bitcoin is negatively associated with its price.In contrast,the frequency of an ethical discussion is positively associated with its price.
文摘变质程度达角闪岩相及麻粒岩相的各类变质岩石在变质作用高峰期后,如果降温速率比较慢,往往发生退变质性质的离子再交换反应与纯转换反应。这两类退变质反应不可避免地改造了变质高峰期的矿物成分,使岩石不能准确记录变质作用各阶段的矿物成分和变质作用p T轨迹。对这两类反应的研究已成为近年来变质岩石学研究的热点之一。本文通过研究实例,简要综述了基性麻粒岩中石榴子石-斜方辉石之间的Fe-Mg再交换反应、酸性麻粒岩中斜长石-碱性长石之间的K-Na再交换反应、泥质片麻岩中石榴子石变斑晶边部的部分分解(纯转换)反应,以及恢复变质高峰期矿物成分和计算变质高峰期p T条件的方法。指出只有在准确恢复变质高峰期变质矿物成分的基础上,获得的变质作用p T t轨迹才能反映客观地质事实。
