首页> 外文期刊>Inorganic Chemistry: A Research Journal that Includes Bioinorganic, Catalytic, Organometallic, Solid-State, and Synthetic Chemistry and Reaction Dynamics >3]2(μ-L)}2–: An Efficient Secondary Building Unit for the Synthesis of 2D Iron(II) Spin-Crossover Coordination Polymers]]>
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3]2(μ-L)}2–: An Efficient Secondary Building Unit for the Synthesis of 2D Iron(II) Spin-Crossover Coordination Polymers]]>

机译:<![cdata [{[hg(scn) 3 ] 2 (μ-l)} 2 - :一个有效的二级建筑单元 2D铁(II)旋转交叉配角的合成]]>

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摘要

We report an unprecedented series of two-dimensional (2D) spin-crossover (SCO) heterobimetallic coordination polymers generically formulated as {Fe~(II)[(Hg~(II)(SCN)_(3))_(2)](L)_( x )}·Solv, where x = 2 for L = tvp ( trans -(4,4′-vinylenedipyridine)) ( 1tvp ), bpmh ((1 E ,2 E )-1,2-bis(pyridin-4-ylmethylene)hydrazine) ( 1bpmh· n CH _( 3 ) OH ; n = 0, 1), bpeh ((1 E ,2 E )-1,2-bis(1-(pyridin-4-yl)ethylidene)hydrazine) ( 1bpeh· n H _( 2 ) O ; n = 0, 1) and x = 2.33 for L = bpbz (1,4-bis(pyridin-4-yl)benzene) ( 1bpbz· n H _( 2 ) O ; n = 0, 2/3). The results confirm that self-assembly of Fe~(II), [Hg~(II)(SCN)_(4)]~(2–), and ditopic rodlike bridging ligands L containing 4-pyridyl moieties favors the formation of linear [Fe(μ-L)]_( n )~(2 n +) chains and in situ generated binuclear units {[Hg~(II)(SCN)_(3)]_(2)(μ-L)}~(2–). The latter act as bridges between adjacent chains generating robust 2D layers. The [Fe~(II)N_(6)] centers are equatorially surrounded by four NCS~(–) groups and two axial N atoms of the organic ligand L. The compound 1tvp and the unsolvated form of 1bpmh undergo complete SCO centered at T _(1/2) = 177 and 226 K, characterized by the enthalpy and entropy variations Δ H = 12.3 and 10.5 kJ mol~(–1) and Δ S = 69.4 and 48 J K~(–1) mol~(–1), respectively. The almost complete SCO of the unsolvated form of 1bpeh occurs at ca. T _(1/2) = 119 K and exhibits a complete LIESST effect. Regardless of the degree of solvation, a half-spin conversion at T _(1/2) 1bpbz· n H _( 2 ) O , which becomes almost complete at p = 0.65 GPa. The labile solvent molecules present in 1bpmh·CH _( 3 ) OH and 1bpeh·H _( 2 ) O have a dramatic influence on the corresponding SCO behavior.
机译:我们报告了一系列前所未有的二维(2D)旋转交叉(SCO)异质相配位聚合物,通常配制为{Fe〜(II)[(Hg〜(II)(SCN)_(3))_(2)] (l)_(x)}·solv,其中x = 2用于l = tvp(反式(4,4'-乙烯基吡啶))(1tvp),bpmh((1e,2 e)-1,2-bis (吡啶-4-基亚甲基)肼)(1bpmh·n ch _(3)oh; n = 0,1),bpeh((1e,2 e)-1,2-双(1-(吡啶-4-乙基)肼)(1bpeh·n h _(2)o; n = 0,1)和L = bpbz的x = 2.33(1,4-双(吡啶-4-基)苯)(1bpbz·n H _(2)o; n = 0,2/3)。结果证实,Fe〜(II)的自组装,[Hg〜(II)(SCN)_(4)]〜(2-)和含有4-吡啶基部分的DIToPIC棒状桥接配体L源于线性的形成[Fe(μ-L)] _(n)〜(2n +)链和原位生成的binuclear单位{[hg〜(ii)(scn)_(3)] _(2)(μ-l)} 〜(2-)。后者用作相邻链之间的桥梁产生鲁棒2D层。 [Fe〜(II)N_(6)]中心被四个NCS〜( - )组和有机配体L的两个轴向n原子包围。化合物1TVP和未经溶剂的1BPM的非溶剂化形式以T为中心_(1/2)= 177和226 k,其特征在于焓和熵变化δh= 12.3和10.5kj mol〜(-1)和δs = 69.4和48jk〜(-1)mol〜(-1 ), 分别。几乎完全的1bpeh形式的SCO发生在CA. T _(1/2)= 119 k并展示完整的Liesst效果。无论溶剂化程度如何,在t _(1/2)1bpbz·n h _(2)o下的半旋转转化,其在p = 0.65 gpa时几乎完成。存在于1BPMH·CH_(3)OH和1BPEH·H·H _(2)O中的不稳定溶剂分子对相应的SCO行为具有显着影响。

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