Photochromism and photomagnetism in crystalline hybrid materials actuated by nonphotochromic units

Abstract

Using the pillar-layer strategy, two isomorphic crystalline coordination compounds with obvious photochromic and photomagnetic behaviors actuated by nonphotochromic ligands were synthesized.

Tunable Reduction of 2,4,6‐Tri(4‐pyridyl)‐1,3,5‐Triazine: From Radical Anion to Diradical Dianion to Radical Metal–Organic Framework

“…Thei mportant bond distances of TPTC À (in 1 and 2)a nd TPTCC 2À (in 3)are given in Table 1. In the crystal structure of 1, the bond distances of N o -C a2 (1.339 (5) )and N m -C a3 (1.330- (5) )a re similar to that of ac ommon C À Nd ouble bond (1.35 ). Theb ond C a1 À C b1 (1.436 (5) )i ss lightly shorter than bonds C a2 ÀC b2 (1.474 (5) )a nd C a3 ÀC b3 (1.471 (5) ), and bonds C e1 ÀC d1 and C g1 ÀC f1 in the pyridine ring b are also shorter than corresponding bonds C e2 ÀC d2 ,C g2 ÀC f2 ,C e3 ÀC d3 , and C g3 À C f3 in other pyridine rings (g and d), indicating rings a and b in TPTC À feature quinoid structures.T he angle between the planes a and b (1.648 8)ismuch smaller than those between a and g (17.048 8)and a and d (8.628 8), suggesting that rings a and b are nearly coplanar.T his arrangement will lead to alarger conjugation between rings a and b. Thestructure of TPTC À in 2 is close to that in 1,a lso featuring aq uinoid structure.The TPTCC 2À in 3 is totally different.…”

Designing a Bifunctional Brønsted Acid–Base Heterogeneous Catalyst Through Precise Installation of Ligands on Metal–Organic Frameworks

“…[6][7][8] Metal-organic frameworks (MOFs), an emerging crystalline hybrid material, are famous for their porous structures and diverse compositions. [9][10][11][12][13][14][15][16] Over the past 20 years, MOFs generation has been one of the important branches in the area of heterogeneous catalysis, owing to their tailored pore size and diverse catalytic centers. 5,10,[17][18][19][20][21][22] Especially, the design of acid-base bifunctional MOF catalysts is an attractive but difficult work, and the formation of most catalytic sites of the existing MOF catalysts has focused on the use of open metal sites as Lewis acid, and basic organic groups of ligands as Lewis bases.…”

2,4,6‐Tri(4‐pyridyl)‐1,3,5‐triazine: Photoinduced Charge Separation and Photochromism in the Crystalline State

“…Up to now, more than 400 coordination compounds involving tpt have been deposited in the Cambridge Crystallographic Data Centre (CCDC) database. These compounds have shown many intriguing properties, such as catalysis, absorption/separation, photochromism, and magnetism . Photoinduced charge separation is a vital process for photosynthesis, solar energy conversion, photocatalysis, photochromism, and photomagnetism .…”

“…These compounds have shown many intriguing proper-ties, such as catalysis, [1] absorption/separation, [2] photochromism, [1d, 3] and magnetism. [3,4] Photoinduced charge separation is av ital process for photosynthesis, [5] solar energy conversion, [6] photocatalysis, [7] photochromism, [8] and photomagnetism. [9] Fu et al foundt hat az inc complex with m-phthalate and tpt as co-ligands underwent photoinduced electron transfer from the m-phthalate ligand to the tpt ligand andf ormeda radical product.…”