Photophysical properties of Ag, Zn and Cd - N-(4-pyridylmethyl)-1,8-naphthalimide complexes: influences of π-stacking and C–H⋯O interactions,CrystEngComm

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Photophysical properties of Ag, Zn and Cd - N-(4-pyridylmethyl)-1,8-naphthalimide complexes: influences of π-stacking and C–H⋯O interactions
CrystEngComm ( IF 2.6 ) Pub Date : 2020-05-29 , DOI: 10.1039/d0ce00555j
Munendra Pal Singh _{1,

2,

3,

4} , Jubaraj B. Baruah _{1,

2,

3,

4}

Affiliation

The influence of π-stacking and C–H⋯O interactions on photoluminescence of a dinuclear silver(I), a mononuclear zinc(II) and a cadmium(II) formylbenzoate complex possessing N-(4-pyridylmethyl)-1,8-naphthalimide are reported. The packing patterns of all the complexes have covalently linked naphthalimide dimers held by C–H⋯O interactions, where the participating naphthalimide rings are on a single plane. The silver complex has an additional naphthalimide ring located parallel over each dimer, and the parallel rings are in a head-to-tail π-stacking arrangement, and such π-stacking is found in the ligand also. Meanwhile, parallel cofacial arrangements among aromatic rings of naphthalimide and formylbenzoate are observed in zinc and cadmium complexes. Silver complex has emission at 515 nm, comparable to the emission of the free ligand, but zinc and cadmium complexes emit at shorter wavelengths as compared to the ligand. Photophysical properties of the ligand and the complexes in solution are distinguishable from that observed in solid state.

中文翻译：

Ag，Zn和Cd-N-（4-吡啶甲基）-1,8-萘二甲酰亚胺配合物的光物理性质：π堆积和C–H⋯O相互作用的影响

π堆积和C–H⋯O相互作用对具有N的双核银（I），单核锌（II）和镉（II）甲酰苯甲酸酯络合物的光致发光的影响报道了-（4-吡啶基甲基）-1，8-萘二甲酰亚胺。所有配合物的堆积模式具有通过C–H⋯O相互作用共价连接的萘二甲酰亚胺二聚体，其中参与的萘二甲酰亚胺环在单个平面上。银络合物具有在每个二聚体上平行定位的另外的萘二甲酰亚胺环，并且所述平行环以头尾π堆叠的方式排列，并且这种π堆叠也存在于配体中。同时，在锌和镉络合物中观察到萘二甲酰亚胺和甲酰苯甲酸酯的芳环之间平行的界面排列。银络合物在515 nm处的发射与游离配体的发射相当，但是与配体相比，锌和镉络合物的发射波长更短。

更新日期：2020-07-06

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