An Investigation on the Role of the Nature of Sulfonate Ancillary Ligands on the Strength and Concentration Dependence of the Second-Order NLO Responses in CHCl<sub>3</sub> of Zn(II) Complexes with 4,4‘-<i>trans</i>-NC<sub>5</sub>H<sub>4</sub>CHCHC<sub>6</sub>H<sub>4</sub>NMe<sub>2</sub> and 4,4‘-<i>trans</i>,<i>trans</i>-NC<sub>5</sub>H<sub>4</sub>(CHCH)<sub>2</sub>C<sub>6</sub>H<sub>4</sub>NMe<sub>2</sub>
ancillary ligands on the value of the quadratichyperpolarizability of Zn(II) complexes with stilbazole-like ligands, the second-order nonlinear optical (NLO) properties of [ZnY(2)(4,4'-trans-NC5H4CH=CHC6H4NMe2)2] complexes (Y = CF3SO3, CH3SO3, or p-CH3C6H4SO3) are investigated. By working at relatively high concentrations (>3 x 10(-4) M), the positive effect of the triflate ligand remains unique while, with
Quadratic Hyperpolarizability Enhancement of <i>p</i><i>ara</i>-Substituted Pyridines upon Coordination to Organometallic Moieties: The Ambivalent Donor or Acceptor Role of the Metal
Therefore we confirmed that as already shown by metalcarbonyl moieties such as “M(CO)5” (M = Cr, W), a soft metal center displays, from the point of view of the perturbation of the quadratic hyperpolarizability of pyridines, an ambivalent acceptor or donor role. The quadratic hyperpolarizability of complexes of more π-delocalized para-substituted pyridine ligands (where X = trans- or trans,trans-(CHCH)nC6H4-4‘-NMe2
对位取代的吡啶4-XC 5 H 4 N(其中X = NMe 2,CMe 3,H,COMe,CN)与羰基金属部分如“顺式M(CO)2 Cl”的配位(M = Rh( I),铱(I))和“面式OS(CO)3氯2 ”产生的增强高达约2个数量级的二次超极化率β的大小的λ游离吡啶。这种作用是由于配位体内配体内电荷转移(ILCT)跃迁的红移(当X是强电子给体时)或对金属-配体电荷转移(MLCT)跃迁的显着影响(当X是强电子受体时)。在后一种情况下,由于Δμ的负值,例如在激励时,二次超极化率可以取负号。因此,我们已经确认,正如金属羰基部分(如“ M(CO)5 ”(M = Cr,W)所示),从吡啶的二次超极化性的扰动角度来看,软金属中心显示出矛盾的受体或供体角色。π-离域对位多的配合物的二次超极化性取代的吡啶配体(其中X =反式或反式,反式-(CH CH)n C 6 H 4 -4'-NMe 2,n = 1或
Effect of the Coordination to the “Os<sub>3</sub>(CO)<sub>11</sub>” Cluster Core on the Quadratic Hyperpolarizability of <i>trans</i>-4-(4‘-X-styryl)pyridines (X = NMe<sub>2</sub>, <i>t</i>-Bu, CF<sub>3</sub>) and <i>trans,trans</i>-4-(4‘-NMe<sub>2</sub>-phenyl-1,3-butadienyl)pyridine
either to a red-shift of the intraligand charge-transfer (ILCT) transition upon coordination (when the substituent in para position is a strong electron donor) or to a metal-to-ligand charge-transfer (MLCT) transition (when the substituent is a strong electron acceptor). In the latter case the quadratic hyperpolarizability has a negative sign, due to the negative value of Δμeg. Therefore the “Os3(CO)11”
与取代的苯乙烯基吡啶的“ Os 3(CO)11 ”簇核配位,例如反式-4-(4'-NMe 2-苯乙烯基)吡啶(L 1),反式-4-(4'- t -Bu-苯乙烯基)吡啶(L 2),反式-4-(4'-CF 3-苯乙烯基)吡啶(L 3)或反式,反式-4-(4'-NMe 2-苯基-1,3-丁二烯基)吡啶(L 4)增强了其二次超极化能力βEFISH,由溶液相直流电场感应的二次谐波(EFISH)生成方法测量。这种作用是由于配位时配体内电荷转移(ILCT)跃迁的红移(当对位的取代基是强电子供体时)或金属到配体电荷转移(MLCT)的跃迁(当取代基是强电子受体时)。在后一种情况下,由于Δμ的负值,例如,二次超极化率具有负号。因此,“ Os 3(CO)11 ”簇核心显示出矛盾的受体或供体角色。一些在该研究中研究了复合物显示出显著值(500之间×10 - 48和900×10- 48产品的ESU)微秒0。
Synthesis and Nonlinear Optical Properties of Carbonylrhenium Bromide Complexes with Conjugated Pyridines
New Structural Motifs, Unusual Quenching of the Emission, and Second Harmonic Generation of Copper(I) Iodide Polymeric or Oligomeric Adducts with <i>P</i><i>ara</i>-Substituted Pyridines or <i>trans</i>-Stilbazoles
作者:Elena Cariati、Dominique Roberto、Renato Ugo、Peter C. Ford、Simona Galli、Angelo Sironi
DOI:10.1021/ic050143s
日期:2005.5.1
The structural, emissive, and nonlinear optical properties of new CuI adducts with para-substituted trans-stilbazolic and pyridinic ligands are reported. Single-crystal X-ray diffraction results indicate that the para-substituent on the organic ligand greatly influences the structural motif by its steric (tert-butyl), electronic/steric (dimethylamino), or bridging-donor (cyano) properties so that two absolutely new structural motifs, polymeric and oligomeric, are found when trans-stilbazole and pyridine carry a dimethylamino group in the para-position. In addition, a surprising photoemission behavior is observed, being the solid-state emission of [CuI(trans-4-stilbazole)](n), [CuI(trans-4'(dimethylamino)-4-stilbazole)](n), and [CuI(4'-tert-butyl-4-stilbazole)], totally quenched. In the case of the noncentrosymmetric CuI adduct of trans-4'-(dimethylamino)stilbazole a discrete second harmonic generation (SHG) occurs.