Lone pair–π vs. σ-hole–π interactions in bromine head-containing oxacalix[2]arene[2]triazines

Two new bromine head-containing oxacalix[2]arene[2]triazines were designed and synthesized. Owing to the bromine head and complementary V-shaped cavity, the solid state structure of oxacalix[2]arene[2]triazine having N,N-dipropylamino substituents showed an intriguing and unique 1D-supramolecular chain-like self-assembly. To provide deep insight into the true nature of the observed stabilizing interactions, i.e., lone pair–π or σ-hole–π interactions, theoretical calculations were carried out. The computations confirm the presence of genuine σ-hole–π interactions. On the other hand, the calculations on the analogous oxacalix[2]arene[2]triazine having chlorine substituents revealed the greater π-acidic character of the s-triazine rings, thus proposing the cleft-like cavity to be more suitable for lone pair–π interactions. This is supported by retrieving the X-ray single crystal structure of the parent oxacalix[2]arene[2]triazine from the CSD which showed the existence of mixed lone pair–π/σ-hole–π and true lone pair–π interactions in the solid state. The study provides constructive clues on the utility of these macrocycles in host–guest and related fields of supramolecular chemistry.

[1]  A. Frontera,et al.  Quantifying conventional C–H⋯π(aryl) and unconventional C–H⋯π(chelate) interactions in dinuclear Cu(II) complexes: experimental observations, Hirshfeld surface and theoretical DFT study , 2018 .

[2]  M. Drew,et al.  Syntheses of four new asymmetric Schiff bases and their Cu(II) complexes: Theoretical calculations to rationalize the packing of molecules in the crystals , 2018 .

[3]  J. White,et al.  Pb⋯X (X = N, S, I) tetrel bonding interactions in Pb(II) complexes: X-ray characterization, Hirshfeld surfaces and DFT calculations , 2018 .

[4]  A. Frontera,et al.  Regium-π bonds: An Unexplored Link between Noble Metal Nanoparticles and Aromatic Surfaces. , 2018, Chemistry.

[5]  M. Drew,et al.  Non-covalent tetrel bonding interactions in hemidirectional lead(ii) complexes with nickel(ii)-salen type metalloligands , 2018 .

[6]  M. Drew,et al.  Formation of a water-mediated assembly of two neutral copper(II) Schiff base fragments with a Cu2(NCS)4 moiety: exploration of non-covalent C–H⋯π(bimetallo ring) interactions , 2018 .

[7]  J. Pasán,et al.  Anion−π Interactions in Hollow Crystals of a Copper(II)-Cyamelurate Coordination Complex , 2018 .

[8]  M. Drew,et al.  Methylene spacer regulated variation in conformation of tetradentate N2O2 donor Schiff bases trapped in manganese(III) complexes , 2018 .

[9]  Jan K. Zaręba,et al.  Recurrent supramolecular motifs in discrete complexes and coordination polymers based on mercury halides: prevalence of chelate ring stacking and substituent effects , 2018 .

[10]  A. Frontera,et al.  H-Bonded anion-anion complex trapped in a squaramido-based receptor. , 2018, Chemical communications.

[11]  A. Frontera,et al.  Coordination Polymers Based on Phthalic Acid and Aminopyrazine Ligands: On the Importance of N–H···π Interactions , 2018, Polymers.

[12]  A. Frontera,et al.  Polymorphism in secondary squaramides: on the importance of π-interactions involving the four membered ring , 2018 .

[13]  A. Frontera,et al.  Structure guided or structure guiding? Mixed carbon/hydrogen bonding in a bis-Schiff base of N-allyl isatin , 2018 .

[14]  V. Lynch,et al.  Flattened Calixarene-like Cyclic BODIPY Array: A New Photosynthetic Antenna Model. , 2017, Journal of the American Chemical Society.

[15]  Sankar Prasad Rath,et al.  Cyclic Bis-porphyrin-Based Flexible Molecular Containers: Controlling Guest Arrangements and Supramolecular Catalysis by Tuning Cavity Size. , 2017, Chemistry.

[16]  E. Hey‐Hawkins,et al.  A Sixteen-Membered Au8 P8 Macrocycle Based on Gold(I) and Diphospha(III)guanidine. , 2017, Angewandte Chemie.

[17]  J. Dutasta,et al.  Emergence of Hemicryptophanes: From Synthesis to Applications for Recognition, Molecular Machines, and Supramolecular Catalysis. , 2017, Chemical reviews.

[18]  P. Xin,et al.  Functionalized hydrazide macrocycle ion channels showing pH-sensitive ion selectivities. , 2017, Chemical communications.

[19]  A. Frontera,et al.  Screening polymorphism in a Ni(II) metal–organic framework: experimental observations, Hirshfeld surface analyses and DFT studies , 2017 .

[20]  Zhenqiang Wang,et al.  Switching on Supramolecular Catalysis via Cavity Mediation and Electrostatic Regulation. , 2016, Angewandte Chemie.

[21]  E. Glendening,et al.  What is NBO analysis and how is it useful? , 2016 .

[22]  Pierangelo Metrangolo,et al.  The Halogen Bond , 2016, Chemical reviews.

[23]  De‐Xian Wang,et al.  Oxacalix[2]arene[2]triazine based ion-pair transporters. , 2016, Organic & biomolecular chemistry.

[24]  J. Řezáč,et al.  On the role of charge transfer in halogen bonding. , 2016, Physical chemistry chemical physics : PCCP.

[25]  Chester K Simocko,et al.  ADMET Polymers Containing Precisely Spaced Pendant Boronic Acids and Esters , 2015 .

[26]  De‐Xian Wang,et al.  Liquid crystalline macrocyclic azacalix[4]pyridine and its complexes with the zinc ion: conformational change from the saddle to flattened shape. , 2015, Chemical communications.

[27]  A. Frontera,et al.  Directionality of π-holes in nitro compounds. , 2015, Chemical communications.

[28]  De‐Xian Wang,et al.  Regulated assemblies and anion responsive vesicles based on 1,3-alternate oxacalix[2]arene[2]triazene amphiphiles. , 2014, Chemical communications.

[29]  J. L. Katz,et al.  Single step synthesis of acetylene-substituted oxacalix[4]arenes. , 2014, Organic letters.

[30]  Huibi Xu,et al.  Tetraphenylethylene-based expanded oxacalixarene: synthesis, structure, and its supramolecular grid assemblies directed by guests in the solid state. , 2014, The Journal of organic chemistry.

[31]  José Elguero,et al.  On the Reliability of Pure and Hybrid DFT Methods for the Evaluation of Halogen, Chalcogen, and Pnicogen Bonds Involving Anionic and Neutral Electron Donors. , 2013, Journal of chemical theory and computation.

[32]  Pierangelo Metrangolo,et al.  Definition of the halogen bond (IUPAC Recommendations 2013) , 2013 .

[33]  Steven E Wheeler,et al.  Understanding substituent effects in noncovalent interactions involving aromatic rings. , 2013, Accounts of chemical research.

[34]  De‐Xian Wang,et al.  Anion-π interactions: generality, binding strength, and structure. , 2013, Journal of the American Chemical Society.

[35]  Mei‐Xiang Wang Nitrogen and oxygen bridged calixaromatics: synthesis, structure, functionalization, and molecular recognition. , 2012, Accounts of chemical research.

[36]  De‐Xian Wang,et al.  SYNTHESIS OF OXACALIX〔2〕m-TERPHENYL〔2〕TRIAZINE AND ITS FUNCTIONALIZATIONS (Dedicated to Dr. Albert Padwa on his 75th birthday) , 2012 .

[37]  Frank Weinhold,et al.  Natural bond orbital methods , 2012 .

[38]  Liang Zhao,et al.  Synthesis of 1,3,5-alternate azacalix[3]pyridine[3]pyrimidine and its complexation with fullerenes via multiple π/π and CH/π interactions. , 2011, Chemical communications.

[39]  De‐Xian Wang,et al.  Ion pair receptors based on anion-π interaction. , 2011, Chemical communications.

[40]  Liang Zhao,et al.  Synthesis and functionalization of heteroatom-bridged bicyclocalixaromatics, large molecular triangular prisms with electron-rich and -deficient aromatic interiors. , 2011, The Journal of organic chemistry.

[41]  J. L. Katz,et al.  Synthesis of inherently chiral azacalix[4]arenes and diazadioxacalix[4]arenes. , 2010, Organic letters.

[42]  Chuan-feng Chen,et al.  Triptycene-derived oxacalixarene with expanded cavity: synthesis, structure and its complexation with fullerenes C60 and C70. , 2010, Chemical communications.

[43]  Meining Wang Heterocalixaromatics, new generation macrocyclic host molecules in supramolecular chemistry. , 2008, Chemical communications.

[44]  De‐Xian Wang,et al.  Halide recognition by tetraoxacalix[2]arene[2]triazine receptors: concurrent noncovalent halide-pi and lone-pair-pi interactions in host-halide-water ternary complexes. , 2008, Angewandte Chemie.

[45]  J. L. Katz,et al.  Synthesis of oxacalixarenes incorporating nitrogen heterocycles: evidence for thermodynamic control. , 2006, Organic letters.

[46]  Erhong Hao,et al.  Synthesis of oxacalixarene-locked bisporphyrins and higher oligomers. , 2006, The Journal of organic chemistry.

[47]  Michael B. Feldman,et al.  Synthesis of functionalized oxacalix[4]arenes. , 2005, Organic letters.

[48]  Hai‐Bo Yang,et al.  A general and high yielding fragment coupling synthesis of heteroatom-bridged calixarenes and the unprecedented examples of calixarene cavity fine-tuned by bridging heteroatoms. , 2004, Journal of the American Chemical Society.

[49]  Steven A Mauro,et al.  The Role of the Minor Groove Substituents in Indirect Readout of DNA Sequence by 434 Repressor* , 2003, The Journal of Biological Chemistry.

[50]  Marcey L. Waters,et al.  Unexpected substituent effects in offset π-π stacked interactions in water , 2002 .

[51]  R. Bader,et al.  A Bond Path: A Universal Indicator of Bonded Interactions , 1998 .

[52]  Qing-Xiang Guo,et al.  Substituent Effects on the Driving Force for Inclusion Complexation of α- and β-Cyclodextrin with Monosubstituted Benzene Derivatives , 1998 .

[53]  R. Bader,et al.  A quantum theory of molecular structure and its applications , 1991 .