[Na_4(H_2O)_7][Fe(OH)_6Mo_6O_(18)]: a new [12] metallacrown-6 structure with an octahedrally coordinated iron at the center

The reaction of an aqueous solution of sodium molybdate with iron powder at low pH (-0.184) gives rise to the formation of a six-member Mo ring-shape cluster with an Fe (II) encapsulated at the center, [Na4(H2O)7][Fe(OH)6Mo6O18](1), which is further linked to a remarkable three-dimensional network via sodium ions.     

超声雾化ICP—AES的研究

报道了超声雾化器改装后作为电感耦合等离子体发射光谱（ＩＣＰ－ＡＥＳ）的进样装置。研究了多元素同时分析的最佳实验条件。在高频功率为３．１×０．７６ＫＷ、载气一０．７２Ｌ／ｍｉｎ和观察高度１．３ｃｍ的条件下，对大多数元素其谱线较经而背景辐射较弱。     

2-羟基萘甲醛苯甲酰腙作配体的钼和钒两个化合物的合成和晶体结构

2-羟基萘甲醛苯甲酰腙(H₂L)由2-羟基萘甲醛和苯甲酰肼在乙醇溶液中制得。利用H₂L分别合成了钼和钒的配合物，[MoO₂(EtOH)L](1) 和 [VO(OMe)L(MeOH)](2)，并测定了它们的晶体结构。配合物1和2是类似的结构单元，钼和钒都采取扭曲的八面体配位构型。     

Na型斜发沸石上Na+-Cu2+离子交换过程动力学

用静态离子交换法研究了Ｎａ型斜发沸石上２Ｎａ＝Ｃｕ＾２＋离子交换动力学，分别测定了液膜扩散常数Ｒ，粒内扩散系数Ｄ和滞留时间Ｔｄ，实验发现，离子交换起始为液膜扩散控制，随后在交换的大部分时间内为粒内扩散控制，并就温度、浓度对离子交换过程速率，Ｃｕ＾２＋平衡交换数量以及滞留时间的影响进行了讨论。     

超声雾化ICP－AES的研究

报道了超声雾化器改装后作为电感耦合等离子体发射光谱（ＩＣＰ－ＡＥＳ）的进样装置。研究了多元素同时分析的最佳实验条件。在高频功率为３．１×０．７６ＫＷ、载气流量０．７２Ｌ／ｍｉｎ和观察高度１．３ｃｍ的条件下，对大多数元素其谱线较强而背景辐射较弱。     

薄板悬挂吸声体吸声性能的研究

本文提供并研究了薄板悬挂吸声体的吸声性能,研究结果表明：薄板悬挂吸声体低频段吸声性能较好,而中高频相对差点。     

A New Coordinated Transition-metal Linked Network Compound Constructed by Octamolybdate Chain

1 INTRODUCTION The polyoxometalates have aroused extensive in-terest due to their alluring topologies and potentialapplications in various fields (e.g. catalysis, biology,medicine and materials science)[1]. A variety of po-lyoxometalate anions and related fragments withoxygen-rich compositions can serve as inorganic li-gands to coordinate secondary transition metal ions(so-called heterometals, such as Cu2 , Ni2 , Co2 andMn2 )[2]. Thus, larger discrete species and infinitelyextending ar…     

Syntheses and Structural Characterizations of a Series of Capped Keggin Derivatives

Hydrothermal reactions of Na2 Mo O2·2H2O and NH4VO3(or V2O5) with appropriate reducing agents such as organic amines, NH2OH·HCl and Mo(CO)6 gave rise to the formation of a series of capped Keggin derivatives, [N(CH3)4]2Na3(NH4)2[(VVO4)MoVI8VIV4O36(VIVO)2]·-13H2O(1), [NH4]7[(VVO4)MoVI8VIV4O36(VIVO)2]·7H2O(2), [HN(CH2CH2)3NH][(PO4)MoV3MoVI9O36(VIVO)2]·-3[N(CH2CH2)3N]·(en)·4.5H2O(3) and [HNH2OH][NH4]2[(VVO4)MoVI8VIV4O36(VIVO)4]·24H2O(4). Single-crystal X-ray diffraction analysis revealed that the anions in 1~3 are two-capped Keggin derivatives with characteristic trans vanadium-oxygen caps, whereas the heteropoly anion in 4 is a tetra-capped α-Keggin derivative with characteristic vanadium-oxygen caps on the equatorial plane.     

木材干燥设备的质量评价

木材干燥设备的选择是一种决策过程,即对干燥设备质量的评价和排序,传统的选择方法只是依靠简单的分析比较,利用层次分析法(AHP)进行木材干燥设备的选择,建立了综合效果层次分析结构模型将决策人的思维过程数学化、系统化,从而使决策依据易于被人接受,并且更具科学性.     

Synthesis and Crystal Structure of Bis（barbiturato） triwater Complex of Copper（Ⅱ）

1 INTRODUCTION A variety of transition metal complexes with barbiturates have been prepared owing to their important roles in clinical detection and identi- fication of drug[1～5]. They have the general formula of M(Ⅱ)(barb)2L2, where M is a transition metal (Co, Cr, Zn, Cu etc), barb the anion of a substituted barbituratic acid and L an organic base, usually pyridine. In these complexes, the donor atom in the barbiturate anion is a deprotonated nitrogen atom and, the coordination …